Chinese Elm Winter

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Chinese Elm Winter

Post  rBose on Thu Nov 29, 2018 1:52 pm

Hey guys,

So i've been having this great Chinese Elm tree for almost 2 years now.

Hes been mostly kept inside ( last winter he was fully inside in a rather cold balcony facing the window ) and he did .. okish.

Starting this year I wanted to slowly get him used to being outside since I moved into a new apartment, and since May this year hes been outside and hes doing really great (got some sunburn but I guess thats fine since temperatures here in Romania during the summer can reach, easily, 40-41C)

Now, my dilemma, winter is coming, and in the coming days we'll have temperatures reaching as low as -20 and I am afraid hes gonna freeze to death, but I cant bring him inside because theres literally nowhere to put him, all rooms are decently warm, above 23C and bringing him in from an almost constant 1-3C degrees to 23+ is going to kill him(i think)

I read online a lot about all kinds of methods, all kinds of places to put him during winter as soon as the first frost arrives, but in my case its either outside in minus temperatures or inside in plus temperatures and I literally dont know what to do.

Putting him in the refrigerator for 40 days with a constant 5c temp doesnt sound bad at all but I am afraid im gonna kill him.


Please, any idea/suggestion is more than welcome!

Will post pics as soon as I get home today

Thanks fellas

rBose
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Re: Chinese Elm Winter

Post  Vlad on Fri Nov 30, 2018 10:28 am

I do not think that U. parviflora is frost hardy in your place ( you have mentioned temps around -20°C in Nov/December ).  Although the frost hardiness would also depend on the region the cultivar come from your climate is based on my knowledge too cold.  
Bringing the tree inside should not kill it.  It will  drop leaves I guess because of the stress but it should make it.  For the next winter try to find better solution for overwintering outside.  Look here for an idea http://janinbonsait.blogspot.com/2018/11/talvetuslaaatikko.html  and check the blog.  I think that if you add a heating mat with temps control it will be OK.   A thick layer of snow to cover the box works as a great insulater as well.
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Re: Chinese Elm Winter

Post  rBose on Sat Dec 01, 2018 8:25 am

Vlad wrote:I do not think that U. parviflora is frost hardy in your place ( you have mentioned temps around -20°C in Nov/December ).  Although the frost hardiness would also depend on the region the cultivar come from your climate is based on my knowledge too cold.  
Bringing the tree inside should not kill it.  It will  drop leaves I guess because of the stress but it should make it.  For the next winter try to find better solution for overwintering outside.  Look here for an idea http://janinbonsait.blogspot.com/2018/11/talvetuslaaatikko.html  and check the blog.  I think that if you add a heating mat with temps control it will be OK.   A thick layer of snow to cover the box works as a great insulater as well.

Hey Vlad,

Thank you for the reply and suggestion, I brought him inside just a few moments ago, hope hell do well, if not im going to freak out and most likely return here for an opinion

As promised:

https://i.imgur.com/C8FWzwL.jpg

Picture was taken 3 months ago, early morning

rBose
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Re: Chinese Elm Winter

Post  Oleg6 on Sun Dec 02, 2018 4:56 pm

If it is frost hardy and I think it probably is, it will not survive on the balcony, it must be in the ground.  It will deteriorate in health year by year if it does not have a dormant period. I have been heard this a number of times and been assured that Chinese Elms can take -20 C.  I bought a Chinese Elm from a grower about 4 years ago, he said it had come from southern China via 4 months in Florida at his suppliers.  He could not say it would survive our winter, I looked online and found an assurance at Bonsai4me that it would.  I was still nervous about putting a tropically grown tree outside in a Canadian winter in one go (it can be -30 C). so I put it in a bar fridge @ 2 C, it did fine, no problems.  The next year it went in the ground outside and has been fine ever since @ -20/-30 C. I have pics but can't add them, no attach button.

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Re: Chinese Elm Winter

Post  Oleg6 on Sun Dec 02, 2018 5:32 pm

I just looked at the container in the above link, that looks good, I don't know for certain what the difference is between in the ground and not. 1 week at -20 and the ground and the root ball are also at -20, the only difference I can see is how slowly and how often the freeze/thaw process occurs. So it would make sense that an insulated box could work but I would get rid of the plastic top and replace it with a lid also lined with styro and maybe thicker styro. Once dormant below 4 C it does not need light and probably not much air circulation either. I would like to try this myself with small less important tree. As for the fridge he pics I have show what I did, take a long piece of heavy bonsai wire, put both ends in the soil looping out and above the tree, next put a plastic bag over the wire and tree and down the side of the pot. The pot with the tree goes in a second pot with the bag hanging between the two pots, the humidity is in any condensation drips into the second pot. Put some water bottles in the fridge with the tree so you water at the same temperature. Mine was in there 60 days, I checked it but only watered once right at the end, probably because of the plastic bag. I then I got nervous and took it out (it could have stayed there 3 months, or what ever is most convenient for you, it's hassle to have a tree like that in the dry winter air of the house) ,leave it in the fridge or take it out & leave the plastic bag over it for humidity until the weather warms up, bend the wire to make sure the bag does not touch the leaves.




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Re: Chinese Elm Winter

Post  rBose on Wed Dec 05, 2018 7:40 am

So my guy has been inside the house at +23 temps ever since I created this thread and so far he is doing ok, he is starting to shed his leaves but overall looks nice

For the next winter period I will try to find a way to keep him at least 1 month in below 5C degrees, I will return with updates

Thanks for the suggestions guys <3

rBose
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Re: Chinese Elm Winter

Post  tozankyaku on Fri Dec 07, 2018 6:28 am

I lost several trees I brought to Reno from Southern California. I have several tropical bonsai I grow on my balcony all year but they are in what I call my mini green house. I used a 3/8 inch insulated plastic it looks a little like cardboard with a sheet of plastic on both sides with tubes in the middle. I took a metal shelving unit 4 feet wide by 6 feet tall and 18 inches deep. Then covered both sides, back and top then made two doors for the front. The corners where all these pieces meet each other are just fitted as close as I could get them and are not sealed completely. The bottom does not have anything there.  The doors overlap each other by two inches. This way I can let the edges of the door meet each other and this will stop them from closing all the way leaving a gap on top for extra ventilation. If the temps go real low I allow them to overlap each other and close up..   I hope that makes sense to you...

Inside I have a temp controller that turns a fan on at 70F degrees so it doesn't get too hot in the winter yes in the winter without the fan inside temps can reach 100F degrees in the sun. The controller also turns on a heater at 50 degrees when it gets to cold at night.  I have a indoor out door temperature monitor so I can record and monitor the hi-low temps. Today our weather has been 34F high and 21F low  The mini green house in the last 24 hours has been 61F degrees high with a 51F degree low. The range can be set at any high or low you want so for something you want to go dormant just set it at 35 low with a 45 high.

This unit was built with a drill a saw screw driver and cost around $300  1steel shelf, bundle of zip ties two sheets of 4x8 plastic 6 steel door hinges, a very small room heater, a small 6 inch DC fan, and a temp. controller. You should be able to build it in 4 or 5 hours in the summer while having a beer... lol

By the way you can grow in this all year but, if your summer is hot like here the inside can hit 125+ with the doors closed so I use hinges with removable pins so I can take both doors off during the summer and have the front completely open.

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Re: Chinese Elm Winter

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