The Tropical Fruit Forum

Citrus => Cold Hardy Citrus => Topic started by: tedburn on April 09, 2021, 04:59:33 PM

Title: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on April 09, 2021, 04:59:33 PM
In summer 2020 I planted a lot of assumed frosthardy citrus varieties in my garden in ground. Due to the plants have been not so big I hoped to get a mild winter, but counted with the worst. And the winter got worse, we got 4 days and nights enduring frost down to 3,2 F ( - 16 C) and during the days frost with 100% full sunlight.
Heavy test for my citrus. Then from 20.2. it got warmer, but always change a few days warm, followed by colder days with night frost. So I show you the result after the severe winter. Hope it can help you to get more information of cold hardiness of citrus varieties 😋.
Regards Frank
(https://i.ibb.co/wsr9yx2/citrus-frost-hardiness-experience-winter-2020-to-2021-compressed.jpg) (https://ibb.co/vYv71KM)
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: kumin on April 09, 2021, 05:18:58 PM
Excellent photos, some surprises. You had a colder Winter than I did.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on April 09, 2021, 05:22:53 PM
thanks kumin, yes it was an ugly winter in our region
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: lebmung on April 10, 2021, 07:35:15 PM
Nice comparisons. To increase the survival rate the graft union must be completely healed 2-3 years and the tree with a trunk diameter of 1 cm, then planted outside in soil.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on April 11, 2021, 03:57:37 AM
Thanks Lebmung, for adding your experience, yes I think this are very true points. In my case, I know that my plants all have been risky ( young and small) but regarding the last warmer winters and using winter protection I decided the risk to be not so high. So hope for a good recovery this summer 😅.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: vnomonee on April 19, 2021, 11:48:21 PM
Like you I risked my small hybrids outside. My lowest in zone 7a this winter was 12f/-11c. My Yuzu defoliated at the very end of winter but it's pushing out new leaves now. My citrumelo had some leaves curl and dry up and then drop but kept at least half of them and is otherwise fine. My tai-tri didn't lose but 1 or two leaves.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on April 20, 2021, 01:59:42 PM
Hello vnomonee, that sounds good for a new restart, congratulation. But it is very difficult to tell early after the freeze how severe the damage is.
My Ichangquat 245 looked pretty good in March and now there are still some more twig damages, perhaps also our bad spring this year with always changing warm weather with night freezes stresses the already harmed plants additionally.
So I'm really curious when the citrus start to grow again and finally to see what is then still damaged. At some small buds are already to be seen.
Think to give an update in a few weeks.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: Citradia on April 20, 2021, 10:15:07 PM
I’ve lost almost all poncirus hybrids when temps reached 5 degrees F and below over several years. Also lost 10 ft tall dunstan and swingle citrumelos when temps never got above freezing, hovering at or just below 32 degrees F for a week. I lost hybrids when they just started putting out new growth in March, when we got a low of 14 degrees, and these were protected in a high tunnel with water barrels next to each tree. The only hybrids that have survived at my place outdoors without being covered and heated by space heaters for the past decade are Dunstan citrumelo, citradia, and Thomasville citrangequat, and they have died to ground and came back from roots several times. I’ve lost several Dunstan and citradia trees too, but these are the only three specimens that I have left. I’ve lost the following over the years: Dunstan, swingle, citradia, rusk, Changsha, mortan, Nansho dai dai, ichangensis, Ichang lemon, carizo, yuzu. I’ve even lost some potted flying dragon one-year seedlings when zero degrees F all night two nights in a row. The small cracks at base of the tree trunk in spring means the tree is going to die; I had a citradia leaf out in spring despite a crack in base of trunk bark and it died suddenly soon after.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: SoCal2warm on April 21, 2021, 03:30:41 PM
I’ve lost almost all poncirus hybrids when temps reached 5 degrees F and below over several years. Also lost 10 ft tall dunstan and swingle citrumelos when temps never got above freezing, hovering at or just below 32 degrees F for a week. I lost hybrids when they just started putting out new growth in March, when we got a low of 14 degrees, and these were protected in a high tunnel with water barrels next to each tree.
From what I have observed, the amount of cold tolerance can go down if the citrus is covered in such a way that creates a greenhouse effect. The very warm daytime temperatures inside the covering then brings the citrus out of dormancy and can make even cold hardy citrus vulnerable to modest cold temperatures.
So I think it is important to describe the conditions of the covering, if that may have been creating a greenhouse effect.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on April 21, 2021, 03:59:28 PM
I’ve lost almost all poncirus hybrids when temps reached 5 degrees F and below over several years. Also lost 10 ft tall dunstan and swingle citrumelos when temps never got above freezing, hovering at or just below 32 degrees F for a week. I lost hybrids when they just started putting out new growth in March, when we got a low of 14 degrees, and these were protected in a high tunnel with water barrels next to each tree. The only hybrids that have survived at my place outdoors without being covered and heated by space heaters for the past decade are Dunstan citrumelo, citradia, and Thomasville citrangequat, and they have died to ground and came back from roots several times. I’ve lost several Dunstan and citradia trees too, but these are the only three specimens that I have left. I’ve lost the following over the years: Dunstan, swingle, citradia, rusk, Changsha, mortan, Nansho dai dai, ichangensis, Ichang lemon, carizo, yuzu. I’ve even lost some potted flying dragon one-year seedlings when zero degrees F all night two nights in a row. The small cracks at base of the tree trunk in spring means the tree is going to die; I had a citradia leaf out in spring despite a crack in base of trunk bark and it died suddenly soon after.

Thanks for your much experiences, very interesting. What I also could observe:
That Thomasville is very cold tolerant, up to now no damage, not even a leave.
That the damages still get more severe the months after the longer deep freeze. Thats really difficult, because I think final result will only be seen in June or July. So I already have lost a Dunstan and my 5* Citrumelo is in pretty bad shape.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: Citradia on April 22, 2021, 02:14:03 PM
Socal2warm, my hybrid citrus die when not covered at all from either too many cumulative days below freezing or from extreme low temps. The ones that broke dormancy in the opened ventilated high tunnel broke dormancy in mid March which is when everything is starting to bloom here. My point was that I get late freezes here and if citrus of any kind other than trifoliata is starting to push new growth, it needs to be kept above freezing at that time or it may die. Today is April 22 and I had a low this morning of 28 degrees and below freezing for five hours. Have had temps in 60’s and 70’s since Early March with one other 29 degree low a few weeks ago. Even my unprotected poncirus has already bloomed. I have to keep my greenhouse frames up and heaters ready to go up until Mother’s Day here. My satsumas and grapefruit are in full bloom and my seedlings and grafted potted citrus are all safe inside my heated enclosures last night and tonight because I am not taking a chance on loosing my crop from last year, still fruit on trees ( grapefruit and Meiwa), or this years blooms, or loosing my trees. My protected citrus grafted on trifoliata and FD actually brake dormancy later than my unprotected trifoliata trees. I think I am doing it right for my roller coaster climate since I have harvested fruit for the past 6 or more years.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on May 02, 2021, 03:20:26 PM
here is the final update of the survivors (new green buds and no dry back anymore) and the candidates with still mortal risk (dry back goes on or rootstock got cracks) and the Dunstan which is already died.
Due to our very cold April ( coldest since many years) the plants start very slow growing.
The Thomasville had new shot and this was eaten by an unknown insect, so because the plant is still small I put it in a net for protection for a few weeks.

(https://i.ibb.co/VNjZWSZ/citrus-frost-hardiness-experience-winter-2020-to-2021final-compressed.jpg) (https://ibb.co/yRf1ny1)
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on June 06, 2021, 12:30:54 PM
Now a final conclusion after the winter is possible.
From the 3 candidates with high mortal risk in the last report, the 5* and the HRS 899 finally died but I' m glad to report, that Ichangquat 245 survived. So from 10 frosthardy variants 7 could survive this for citrus very hard winter and spring.
Best regards Frank
(https://i.postimg.cc/sGZgyvzK/IMG-20210606-172720867.jpg) (https://postimg.cc/sGZgyvzK)
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: nullroar on June 22, 2021, 11:52:31 PM
Exceedingly helpful! As a 7b-er trying to grow citrus out here, i really appreciate the data!
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on June 23, 2021, 12:22:36 AM
So I' m glad if my post is useful.
Regards Frank
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: Perplexed on June 23, 2021, 03:13:16 AM
Don't know why the photo is so blurry- tried with Firefox and Chrome
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on June 23, 2021, 01:06:47 PM
Hello Perlexed,
I checked with Android, try to tap on the blurry picture then you get asked if you want full resolution. If you tap on this, you should get full resolution and don' t have a blurry photo. Due to file datasize I was forced to compress.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: SoCal2warm on June 23, 2021, 11:13:45 PM
Don't know why the photo is so blurry- tried with Firefox and Chrome
It's tricky, but if you slowly and carefully start scrolling down to the middle of the picture, there should be a button in the middle of the picture you can click which says "Load full resolution".
When you click the button, the entire thing will stop being blurry.
The button will not be visible until you start going down to be able to see the midpoint in the very elongated image.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: Perplexed on June 23, 2021, 11:21:11 PM
Thanks y'all. I see it now
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: Zitrusgaertner on June 24, 2021, 11:24:43 AM
Tedburn, maybe you could make another try with high grafted plants. Let's say 80 - 100cm poncirus stem under the scion. I was successful with this concept. And sun protection is very important.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on June 24, 2021, 05:17:27 PM
Thank you Zitrusgärtner, up to now I hadn' t the possibility to highcraft, but I agree that this is very helpful,
also the sun protection.
How is your HRS899 A did you have fruits last year ?
Regards Frank
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: Zitrusgaertner on June 29, 2021, 06:40:33 AM
No, 899A lost its fruits after heavy blooming. This year there are no flowers at all. I have to recraft 899A and 899J. The plants are very old (more than 20 years) and roots are not good anymore. 899J did not bloom aswell.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on June 29, 2021, 08:44:51 AM
Thank you Zitrusgärtner, So it seems the HRS xxx varieties are a little bit like Divas. I lost mine this years but I think it was not only the cold but also a rootstockproblem.
Have now a new one in a different place - so lets see what the next winter brings  ;).
Regards Frank
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on August 01, 2021, 12:38:26 PM
Summer update of my survivors which suffered most.
Sanford with strongest recovery

(https://i.postimg.cc/wRHxPq28/IMG-20210801-175040.jpg) (https://postimg.cc/wRHxPq28)
Sanford Curafora


(https://i.postimg.cc/mPh9Vjh3/IMG-20210801-175143.jpg) (https://postimg.cc/mPh9Vjh3)
Yuzu


(https://i.postimg.cc/RW8HYtnk/IMG-20210801-175334.jpg) (https://postimg.cc/RW8HYtnk)
Morton Citrange
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: poncirsguy on August 01, 2021, 01:23:53 PM
Looks really good.  Do you have pictures of the yuzuquat and Thomasville citrangequat.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on August 01, 2021, 02:10:27 PM
Thomasville is a good story, Yuzuquat is an unlucky story.

(https://i.postimg.cc/7brXZ5Z1/IMG-20210607-122121.jpg) (https://postimg.cc/7brXZ5Z1)
Ichangquat in begin of June, two sprouts I was happy  ;D

then a few days later, a snail killed me both sprouts :-\, so I repotted the plant and now Im still hoping/waiting. I had new sprouts but from the rootstock, which I had to remove.

(https://i.postimg.cc/FYXhPgrd/IMG-20210801-195413.jpg) (https://postimg.cc/FYXhPgrd)
Ichangquat today


(https://i.postimg.cc/Pppcs9Kt/IMG-20210801-175209.jpg) (https://postimg.cc/Pppcs9Kt)
Thomasville today, in good shape.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: poncirsguy on August 01, 2021, 08:20:49 PM
would it make any sense to to grow in a 5+/- gallon pot till it is 3+ feet tall before planting in ground early spring.
(https://i.postimg.cc/RqCBhYfD/IMG-0411.jpg) (https://postimg.cc/RqCBhYfD)
6 weeks since planting in ground, a 4.5 year old seed grown Meiwa kumquat with a  0.5cubic meter canopy is starting to grow flower buds as well as foliage.  It is unlikely that animals will do much damage.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on August 02, 2021, 09:15:06 AM
Yes, I regret not to have taken the plant into pot directly after winter for recovery. But the last years we nearly had no snails so I didn' t took that into account.
But you are right, that bigger plants have no problem to loose a few leaves or sprouts by snails.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on August 28, 2021, 08:29:52 AM
Poncirusguy, sorry for the delay, here the pictures

(https://i.postimg.cc/yJPBb3Ch/IMG-20210828-140852543.jpg) (https://postimg.cc/yJPBb3Ch)
Thomasville

(https://i.postimg.cc/DSvxcS53/IMG-20210828-141004894.jpg) (https://postimg.cc/DSvxcS53)
Ichangquat, after snailattack to fresh sprouts I hadto repot, but now only rootstock sprouts  ::), don' t know if the ichangquat will survive.
regards Frank
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on October 07, 2021, 01:13:32 PM
update of citsuma Prague and Ivia, which are grown, but not so much as Sanford and Yuzu.

(https://i.postimg.cc/8sWMLXtB/IMG-20211007-113539712.jpg) (https://postimg.cc/8sWMLXtB)
Sanford for comparison, about 80 cm high

(https://i.postimg.cc/Yv4WqXGW/IMG-20211007-113729652.jpg) (https://postimg.cc/Yv4WqXGW)
Citsuma Prague

(https://i.postimg.cc/rzcxCCbB/IMG-20211007-113804613.jpg) (https://postimg.cc/rzcxCCbB)
Ivia
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on October 16, 2021, 07:43:37 AM
winter preparations are starting although no freeze annonced for the next 10 days.
This time will try to make bricks arround the plants and then wrap around cocos mats. Perhaps this time I still add one or two water bottles if place is enough. And finally I hope we not get again down to 3,2 ° Fahrenheit  ;).
<br />(https://i.ibb.co/89cQ8Ym/IMG-20211016-132225.jpg) (https://ibb.co/89cQ8Ym)<br />
Yuzu, last year no protection was to optimistic, freeze nearly to ground,   ( but didn' calculated to get 3,2°)

<br />(https://i.ibb.co/m8sgwKP/IMG-20211016-132112.jpg) (https://ibb.co/m8sgwKP)<br />
Citsuma Prague

<br />(https://i.ibb.co/vwqBJjz/IMG-20211016-132131.jpg) (https://ibb.co/vwqBJjz)<br />
Ivia

<br />(https://i.ibb.co/gWGZ75y/IMG-20211016-132158.jpg) (https://ibb.co/gWGZ75y)<br />
HRS 899A, new try at new location (plant last year died after winter and spring freezes)

regards Frank
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on December 13, 2021, 12:54:41 PM
Winter preparations (first step sun protection with fleece) finished.
For Ichangensisxsinensis and Satsuma Collot a 80 Watt heating cable is installed if temperatures exceed -8 ° Celsius for several days it will be connected and additional isolating material as now on the top will be wrapped around.


(https://i.postimg.cc/tYcdr2vf/IMG-20211213-125524050.jpg) (https://postimg.cc/tYcdr2vf)

the hardier citrus with sun protection. If cold spells are deeper than -10 ° Celsius for several days are announced, an additional cocosmat will be also wrapped around.
This year there is a new citrus CitrumeloxYuzu in ground, lets see how it will go over the freezing period.
Last years January to March are the periods with deepest temperatures.

(https://i.postimg.cc/mtgVpcLc/IMG-20211213-125619739.jpg) (https://postimg.cc/mtgVpcLc)
regards Frank
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on December 28, 2021, 01:39:40 PM
While up to now our winter is not to cold, the coldest period have been 4 days with temperatures at night with about 20 ° F (-7° C).
But this is still not the end of our winter, due experiences of the last years, the most challenging months in the last years have been January and February. Today and the next days we have temperatures of 48 - 57 ° F ( 9- 14 ° C ).
Nevertheless its always interesting to gather informations about winter protection strategies in our cold climate (for citrus), so quite interesting to read the article in the link  below, perhaps also interesting for some of you.
https://aggie-horticulture.tamu.edu/citrus/cold/L2287.htm
Regards Frank
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on February 03, 2022, 07:05:51 AM
Some news of my 2021 new in ground planted 1 year old seedlings and new 2021 grafting from Morton on existing Poncirus, since a few years in our garden.
All 2020 in ground planted citrus in best shape due to up to now very mild winter t min was about -8 ° C, 18°F, hope February will continue like that.

(https://i.postimg.cc/d7tkc9M7/IMG-20220203-122050835.jpg) (https://postimg.cc/d7tkc9M7)
1 year old Ichangensis SRA 241 seedling without protection, very good shape

(https://i.postimg.cc/YhPMCfmG/IMG-20220203-122115101.jpg) (https://postimg.cc/YhPMCfmG)
in front Ichangstar60 seedling from Ilya, looks pretty good ( little bit minerals necessary in spring). Behind IVIA, both had a slight fleece protection

(https://i.postimg.cc/vg5dPpP5/IMG-20220203-122130223.jpg) (https://postimg.cc/vg5dPpP5)
IVIA with stone and fleece protection, top of the plant not in good shape

(https://i.postimg.cc/9DqVRRGx/IMG-20220203-122212587.jpg) (https://postimg.cc/9DqVRRGx)
Dunstan seedling, stone and cocosmatprotection, top of the plant frozen, perhaps cocosmat touched planttop.

(https://i.postimg.cc/fJyMsgkQ/IMG-20220203-122315910.jpg) (https://postimg.cc/fJyMsgkQ)
2021 graft Morton on Poncirus looks pretty good
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on February 16, 2022, 01:06:49 PM
Sanford Curafora F2 after (nearly) second winter
(https://i.postimg.cc/PpYyCMTx/IMG-20220216-163206913.jpg) (https://postimg.cc/PpYyCMTx)

Citrumelo x Yuzu after first winter
(https://i.postimg.cc/jCr0ZgWM/IMG-20220216-163222509.jpg) (https://postimg.cc/jCr0ZgWM)

Rest of February no frost announced, so I' m assuming no winter damages this year. All other in ground  citrus, Citsuma Prague, Yuzu, Morton, Ichangensis IVIA, Citrangequat Thomasville in best shape. T min this winter was -8 ° C ( 18 ° F). Also Satsuma Collot, Keraji Mandarin and Ichangensis x sinensis in ground which have been prepared with heating cables, which I didn' t had to use, no damages at all.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: kumin on February 17, 2022, 02:20:48 AM
Great vigor on the Curafora growth flush. Nice to see healthy Citrus.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on February 18, 2022, 02:50:44 AM
Thanks Kumin for your appreciatung comment. Yes in late winter it is aleays interesting to see how the plants managed the cold and I' m glad this modrate  2 nd winter gives a good chance to further strengthen  the plants. I like the Curafora also vry much for her habit and groth, now waiting for blossoms in late spring. Only problem will be ripening of fruit  not in the same year - so much likely frost damage of the fruit. But lets see, one step after the other  ;).
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on March 22, 2022, 03:32:46 PM
A few days ago I freed my inground citrus from winter protection fleece and all looked in very good shape. Regarding my Citsuma Prague it was to early, at least sun protection should have been stayed established. So a few mornings with freeze and days with about 10 h sun led to slight frostcracks, picture 1.
Now I still installed a sun protection, picture 2.
Near to my Citsuma is a Citrumelo x Yuzu, which has no problems with freeze and sun, picture 3.


(https://i.postimg.cc/HrKqHShg/IMG-20220322-122858833.jpg) (https://postimg.cc/HrKqHShg)

(https://i.postimg.cc/Lq33v5fb/IMG-20220322-122603474.jpg) (https://postimg.cc/Lq33v5fb)

(https://i.postimg.cc/w1K5pLQr/IMG-20220322-122706854.jpg) (https://postimg.cc/w1K5pLQr)


Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on March 26, 2022, 02:37:08 PM
Today we had wonderful weather, so I reconstructed my wall of sandstones  and made place for 3 citrus candidates to plant in open ground.
On the right I try a Slava Micurina Orange, in the corner left this is a bigraft on Poncirus with Bloomsweet and Staraji 55 and on the left there is a Duncan Grapefruit.
These citrus are perhaps not fully hardy for my zone so in every case I have to watch meteoforecast and secure with heating cables the next winters. If the winters are not as mild as this years winter.
Total left behind the grape trunk is a Keraji mandarin, which managed two winters now. Hope to get blossoms this year.

(https://i.postimg.cc/c6gjFTSz/IMG-20220326-133200434.jpg) (https://postimg.cc/c6gjFTSz)
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on April 12, 2022, 12:24:44 AM
Yesterday I used the sunny weather to give my Sunford two little children which will have fruits with earlier maturity, if all works well - we' ll see 😅
(https://i.postimg.cc/75t4WtcP/IMG-20220411-180600836.jpg) (https://postimg.cc/75t4WtcP)
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: Zitrusgaertner on April 12, 2022, 02:49:27 PM
which will have fruits with earlier maturity, if all works well - we' ll see 😅
(https://i.postimg.cc/75t4WtcP/IMG-20220411-180600836.jpg) (https://postimg.cc/75t4WtcP)

Why do you think so?
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on April 12, 2022, 03:26:52 PM
After my knowledge and experience Sanford matures not within one year, so the fruit will not be ripe before april or may in Germany. So the idea was to graft relativ frosthardy citrusvarieties which mature earlier. Nippon Orangequat had a ripe fruit in January and Keraji end of December.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on May 15, 2022, 06:06:26 AM
Just a short update
first picture, small 2020 planted Thomasville in winter shadowy place now starts growing, never damaged, but slowgrowing on Poncirus and in this winter shadowy place.
(https://i.postimg.cc/QB3qgv4g/1040354.jpg) (https://postimg.cc/QB3qgv4g)

new plantation in April 2022, right an Orange slava micurina, in the middle a bigraft of Bloomsweet and Staraji 55 on Poncirus and left a Duncangrapefruit on Poncirus.

(https://i.postimg.cc/Js1nbq3D/1040360.jpg) (https://postimg.cc/Js1nbq3D)

Rest of all planted citrus varieties of 2020, now good growing.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on May 23, 2022, 03:34:31 PM
chimera Prag is slow and confuse growing but now it presents the first flower bud of all my in ground citrus 😅.

(https://i.postimg.cc/dLkdSPqH/1040450-citsuma-prague.jpg) (https://postimg.cc/dLkdSPqH)

(https://i.postimg.cc/87gFK7Xc/1040455bl-te-prague.jpg) (https://postimg.cc/87gFK7Xc)

Morton Citrange on FA5 is good growing and further recovering of winter damage 2020/2021. This winter no damage.

(https://i.postimg.cc/XBvh0N2y/1040444citrange-morton.jpg) (https://postimg.cc/XBvh0N2y)
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: Zitrusgaertner on May 25, 2022, 03:18:38 PM
I suppose FA5 is less hardy than Morton. Why did you choose this rootstock?
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on May 25, 2022, 06:11:51 PM
I suppose you are right. But the rootstock FA5 was a recommendation for earth with higher ph and it was assured that FA5 is nearly as hardy as Poncirus, so I thought to try it. And I even was not disappointed in Winter 2020/2021 when the young plant supported -15 ° C with passive protection. Meanwhile I also have Morton grafted on a Poncirus in ground and a flying dragon in ground, so I can compare the next winters and seasons. Perhaps the effevt of deep dormancy is perhaps an additional advantage of poncirus.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on May 28, 2022, 03:48:19 PM
today 14 months after grafting my Dunstan was left free in ground. Second chance for Dunstan. But now on Poncirus, the one I lost in winter 20/21 was on Citrumelo Broza (no worthful rootstock, because it died also after the winter).
(https://i.postimg.cc/hXSmBz5M/1040519.jpg) (https://postimg.cc/hXSmBz5M)
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on June 13, 2022, 04:52:43 PM
Chimera Prague, first flower after 2  years in ground  :D

(https://i.postimg.cc/n9KMy9nH/1040677.jpg) (https://postimg.cc/n9KMy9nH)
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: poncirsguy on June 13, 2022, 05:15:30 PM
Congratulation.  Looking good.  Hope you get fruit from this.
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on June 14, 2022, 12:19:10 AM
thank you, yes I' m also excited if the plant will keep a fruit.
If so I will show a picture  ;).
Regards Frank
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on July 07, 2022, 01:52:07 PM
The Chimera Prague lost the small fruit after a few weeks.

Two new plants for winterhardytest are new in ground.
First a multigraft on Flying Dragon with Morton Citrange, Dunstan and 5* Citrumelo.
Bloomsweet and Keraji are new grafts on the Flying Dragon.
(https://i.postimg.cc/8s6Zr219/20220707-193351.jpg) (https://postimg.cc/8s6Zr219)

Following picture is Ichangquat on Poncirus
(https://i.postimg.cc/FkLCrqRt/20220707-193403.jpg) (https://postimg.cc/FkLCrqRt)
Title: Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
Post by: tedburn on August 27, 2022, 01:50:19 AM
Just a short update of my frosthardy citrus.
They all are doing well after 2 years in ground.
Though only Chimera Prague and Ichangensis Ivia had one flower each the others none. But all are good growing though some are slowly growing, especially my Thomasville and Ivia but also Chimera Prague is abmore slow grower.
Here two pictures of the smallest one, Thomasville, and the fastest grower Sanford Curafora F2 with an heigt now of 1,3 m, after restarting in may 2021 by 20 cm after frost damage in the 1. winter.
Enjoy your frosthardy citrus , ;D
(https://i.postimg.cc/qzFnRR5Y/IMG-20220825-181709526.jpg) (https://postimg.cc/qzFnRR5Y)

(https://i.postimg.cc/HjxVymXC/IMG-20220825-182116904.jpg) (https://postimg.cc/HjxVymXC)