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Topics - kumin

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Citrus General Discussion / LSU Ag Citrus Freeze Damage Video
« on: March 25, 2021, 11:58:38 AM »
Informative video concerning preparing Citrus prior to a freeze event, and assessing post-freeze damage. Applicable for standard Citrus, as well as cold hardy Citrus.

Cold Hardy Citrus / New Jersey Yuzu Growers
« on: January 31, 2021, 10:35:53 AM »
Interesting video on indoor/outdoor semi-commercial Yuzu growers in New Jersey. The daughter has put her new skills to good use.

I'm considering top grafting Kaffir Lime onto 6-8 year old Poncirus trees in the late Spring. This would only be for the duration of the season, knowing that Fall temperatures would quickly kill them off.
Does anyone have experience doing this and was the resulting growth worth the effort? If successful, I may be eating a lot of Thai food next Summer!

An unnamed trifoliate hybrid described, with some pluses and several minuses. It appears to be rather hardy, with juicy flesh and modest seed count. The reviewer wasn't entirely favorably impressed by the trifoliate flavors.


I actually thought it had been sequenced earlier. Now we need to harness it's deciduous and cold hardy properties.

Citrus General Discussion / History of Temple tangor
« on: September 26, 2020, 06:29:43 AM »
A favorite Citrus in my youth. Sweet, juicy and well colored. I don't recall it having a particularly long storage life off the tree.
The seeds are 100% zygotic and abundant in the standard cultivar.

Cold Hardy Citrus / Nearly thornless Conestoga segentrange
« on: July 26, 2020, 09:34:32 AM »
Conestoga #002, nearly thornless selection. Nice to see after dealing with Poncirus.

Cold Hardy Citrus / Spaneet citrange?
« on: May 01, 2020, 08:09:17 PM »
Is anyone familiar with Spaneet citrange? The descriptions given are:
1. Deep orange rind color
2. Nearly seedless
3. Very juicy
4. Furrowed at pistol end
5. Size small - similar to Rusk
6. Very vigorous and productive
7. Cold hardy
Sounds very interesting, especially in regards to color, juiciness, vigor and productivity.
French translations tend to use the word "rustique" (rustic) to convey "hardiness".

Sources: Free >fr>trifoliates
and  les cultivars de citranges (-13C)

Citrus General Discussion / New rootstock de-thorning tool.
« on: March 20, 2020, 03:28:30 PM »
Repurposed dog nail clippers works just fine for thorn removal on 400 Poncirus yearling rootstocks. Unlike the dog, the seedlings don't squirm in the process!

Cold Hardy Citrus / Poncirus+ early bud break
« on: March 09, 2020, 06:43:54 AM »
There's been at least one post questioning Poncirus+ winter hardiness. Due to experiencing a very mild winter, I can't really address it's ultimate winter hardiness, except noticing that they're the only trees showing bud-break this early. None of the citranges, other Poncirus, TaiTri, 5* citrumelo, Ichangquat, etc. are showing bud-break. Perhaps this early loss of dormancy contributes to decreased hardiness.
It remains to be seen whether the remainder of the selections will follow within days, or will remain dormant for several additional weeks.

Citrus General Discussion / Paired thorns on F2 citrange
« on: February 03, 2020, 10:51:44 AM »
I've noticed a twig with 3 consecutive sets of paired thorns on a F2 citrange specimen. Some distant Citrus relatives are armed with paired thorns,(Hesperethusa crenulata on occasion) I'm not certain how common this feature is among Citrus. Hesperethusa's compound leaves have a resemblance to Poncirus, although fruits and bark are quite different.

I see there's an additional pair at the base of the scion.

Citrus General Discussion / South African Citrus Educational Videos
« on: December 27, 2019, 12:21:15 PM »
A good deal of information as it relates to South African Citrus Propagation and Cultivation practices. From a commercial production perspective. A lot of material to digest.

Cold Hardy Citrus / TaiTri vs 5* deciduousness and hardiness
« on: December 13, 2019, 03:47:19 PM »
Is anyone familiar with both TiaTri citrandarin and 5* citrumelo in respect to their winter hardiness? The first indications I see are that TaiTri shows a bit of deciduousness while I see none in the 5* at this point.  Some of my segentrages show appreciable deciduous behavior, others don't. TaiTri also made less late growth. Which has shown better cold resistance?

Citrus General Discussion / 7 on 1 inverted bud grafts
« on: August 29, 2019, 12:22:41 PM »
Here is a photo of a bud graft of 7 individual scions onto 1 Poncirus rootstock. All 7 buds "took", and 4 quickly pushed new growth. A 5th bud began to push in the last week. 2 buds remain dormant at this time. They were budded using inverted T-buds. I had done several hundred T-buds in the past, mostly on Prunus cultivars. These were the first inverted T-buds I did and they did great.

Photos of a simple graft for joining a small diameter scion with a range of similar or larger diameter actively growing rootstocks. These have worked very well for me in the past.

Selected Poncirus rootstock.

Scion donor F2 citrange plant.

Scion severed from donor.

Epidermis shaved off of scion side 1.

Epidermis shaved off of scion side 2.

Shallow downward cut on rootstock - avoid cutting into wood.

Scion ready for insertion. Leaf area has been reduced to 25-30% to reduce transpiration.

Scion fitted for insertion.

Graft wrapped with parafilm.

Completed graft showing flush of growth present at time of grafting.

An example of this type of graft after 18 days. This graft will be re-wrapped until healing is complete.

Cold Hardy Citrus / Root graft transferred cold hardiness effect
« on: May 09, 2019, 01:00:06 PM »
As I'm potting F2 Citrange winter survivors I'm noticing an interesting phenomenon. Due to the large number that were hand planted (20,000 - 21,000) plants, they were planted 4 per hole. Even so, planting took 40 hours to complete.

I've noticed some of the hardy plants have one or more of the companion plants beginning to grow from a low point on the stem. As I attempt to separate them, some are joined by self-grafted roots. It appears the hardy plant has slightly increased the hardiness of the joined companion plant. The stem of the recipient plant has only slightly increased stem hardiness. The effect is noticeable very low on the stem, just above the roots. It appears planting them individually would have prevented this, however 40 hours of hand planting was near my endurance limit.

I suspect there is some correlation between leaf size and stem thickness in seedlings to the fruit size they will produce when they attain maturity. Has anyone found such a link, and if so, how closely were these characteristics linked? Pummelo and citron as well as grapefruit appear to follow this trend.

Cold Hardy Citrus / Citrus seed germination beginning in 6 days
« on: March 01, 2019, 02:15:12 PM »
Here is the first indication of 27 TaiTri seeds beginning to germinate on day 6 inside a repurposed poultry egg incubator. The auxiliary thermostat is set at 86 deg. F., the seeds were disinfected and the seed coats were removed prior to planting. Disinfection and seed coat removal decrease the likelihood of there being albino seedlings.
This setup should use very little energy.

First seed close to emergence

Replacement thermostat used, original thermostat removed. Setpoint 86 deg. F.

Retired incubator repurposed as seed germination mini-chamber.

Roots have also begun development.

Cold Hardy Citrus / F2 citrange winter hardiness trial
« on: January 25, 2019, 08:04:22 AM »
I'm trialing a population of F2 Citrange seedlings this winter in zone 6b in SE PA. There is considerable variability in the resistance to low temperatures, with some dying in November and others still viable at this point. The population is a mixture of nucellar  F1 and zygotic F2 seedlings. The F1 are freezing out at present, but a number of the F2 are surpassing the F1 in hardiness and a few appear to be surviving the winter. My hope is that several will approach the hardiness of P. trifoliata.

Any survivors would then be evaluated for palatability. My focus is centered on hardiness, with palatability being secondary.

I've grown poncirus since 1980 and lost everything above the snowdrifts in Jan of 1994. This was after 2 consecutive nights at -24 F. The trees resprouted below the snow height and haven't been injured since.

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