Author Topic: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F  (Read 6254 times)

tedburn

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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.


Following picture is Ichangquat on Poncirus


tedburn

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Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
« Reply #51 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




tedburn

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Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
« Reply #52 on: September 29, 2022, 12:57:56 AM »
In ground Ichangensis Ivia, slow growing, still get flower buds in early autumn.


tedburn

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Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
« Reply #53 on: October 23, 2022, 02:36:15 PM »
After a long search still got some scions of Clemyuz 2-2 ( Ten degree tangerine), all took very good, also this one which I grafted directly on inground Poncirus. Interesting to see, how the first winter will get managed  ;)


raze

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Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
« Reply #54 on: October 25, 2022, 08:06:06 PM »
Hi, just chiming in with my project of trying to grow outdoor yuzus in Helsinki/zone 6b.

- Started on March 2022 after ordering fresh yuzu for some seeds. Germination March-April.
- Moved small plants on my balcony during May for the summer. They seem to grow better indoors with lamps, but I'm low on space indoors.
- On October I decided to split plants into two groups. About a third I'm trying to make survive on my balcony during the winter. I'm planning to use various methods and see how they react to them. Some will be left fully exposured to the weather. Some will be stored on open and closed styrofoam containers. Some will be wrapped in frost-protecting blanket. Two thirds of the plants I brought indoors to grow some better roots & stem, and I will repeat the outdoor procedure next winter. Some of the plants I will plant outdoors next spring and see if they will survive at all in 6b zone.

The plants I'm trying to make survive the winter: https://imgur.com/a/g7wkLIE

Last winter Helsinki experienced temperatures going as low as -18c. My balcony stays about five degrees higher than this. Freezing temperatures lower than -25c are very rare in vicinity of the ocean, but occasionally do happen.

tedburn

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Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
« Reply #55 on: October 26, 2022, 12:24:29 AM »
Hello Raze, interesting and challenging project with nice plants  ;). Referring to my experiences, and reports of others, Yuzus can bear about -14 ° C in open ground.
So perhaps You also could use a heating cable for the cases when unfortunately some very cold frosty days will occur. In this way I could protect and save a Satsuma Collot in open ground in the very cold February 2021.
If you have fun with citrus you also could try Citrange or Citrumelo varieties or chimera Prag, which can take still a few ( 2-3 ° C) degrees more low temperature.
Best regards and good success.
Frank

Florian

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Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
« Reply #56 on: October 26, 2022, 07:51:17 AM »
Hi, just chiming in with my project of trying to grow outdoor yuzus in Helsinki/zone 6b.

- Started on March 2022 after ordering fresh yuzu for some seeds. Germination March-April.
- Moved small plants on my balcony during May for the summer. They seem to grow better indoors with lamps, but I'm low on space indoors.
- On October I decided to split plants into two groups. About a third I'm trying to make survive on my balcony during the winter. I'm planning to use various methods and see how they react to them. Some will be left fully exposured to the weather. Some will be stored on open and closed styrofoam containers. Some will be wrapped in frost-protecting blanket. Two thirds of the plants I brought indoors to grow some better roots & stem, and I will repeat the outdoor procedure next winter. Some of the plants I will plant outdoors next spring and see if they will survive at all in 6b zone.

The plants I'm trying to make survive the winter: https://imgur.com/a/g7wkLIE

Last winter Helsinki experienced temperatures going as low as -18c. My balcony stays about five degrees higher than this. Freezing temperatures lower than -25c are very rare in vicinity of the ocean, but occasionally do happen.

Welcome to the forum and to the wonderful world of citrus.
Your seedlings look strong and healthy. However, you will have to be patient for them to flower (5-7+ years). If you plant them too small and they freeze back, you might never see flowers.

If you don't know it already, you should learn how to graft and sow some Poncirus rootstocks. It saves you so much time (and money too). As far as I know, there are no or few restrictions within the EU, so you should be able to source budwood from other growers fairly easily.

Poncirus trifoliata is the only citrus that could theoretically handle your zone without protection. Have a look at less awful selections like Poncirus+ or Swamp Lemon.

And finally, citrus coldhardiness depends on a lot of factors. They don't like too much winter sun followed by freezes or prolonged freezes. It doesn't matter that a Yuzu can take -12 C or lower. If your daytime highs stay below 0C for several days or even weeks, it will cark it much sooner.



tedburn

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Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
« Reply #57 on: November 19, 2022, 09:45:59 AM »
My wife bought me very excellent Clementines, unfortunately there was no variety named. Due to a information from a french citrusfriend that clementine clemenules survived one winter with -14 ° C, I thought to try to graft the small twiggs which came with the clementines on some of my Poncirus and citrumelos in pots but I also made two grafts on my Sanford Curafora in ground. Not sure if this will work during winter but we' ll see in spring/ summer, if it worked. I thought it worth a try  ;).





vnomonee

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Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
« Reply #58 on: November 19, 2022, 11:19:50 AM »
Those grafts can take even now, I've done them with 3 different mandarins and tangerines with stem from the grocery store fruit
around this time as well just make sure they are warm and have enough light. They will turn black or mold if they were not fresh enough
« Last Edit: November 19, 2022, 08:01:28 PM by vnomonee »

tedburn

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Re: Frosthardiness experience with citrusvarieties in zone 7, down to 3,2 F
« Reply #59 on: November 20, 2022, 03:22:35 AM »
Thank you, yes I put the most grafts in my greenhouse, only the two ones on Sanford stay outside by temperatures between 3 and 12 ° C the last and the following days - spring will tell 😅

 

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