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In need of help for overwintering bonsai trees in Canada.?

The last two winters I have gotten away by the skin of my teeth with my unheated cold frame and wood chips but I have noticed that my smaller trees usually suffer and I lose many of them. It gets really cold here (sometimes -30 degrees celsius).?Additionally, my collection has grown substantially and I want to find a new more reliable solution for the upcoming winter of 2024.?

I have been reading through the “ ” webpage under the resources tab and have come across a few key points that have been consistent with my other research as well.

1. Keep the air between 2 and 5 degrees celsius for best results
2. If you are using a greenhouse, keep the sun out with insulation or plywood sheets to prevent large swings in temperature (the trees don’t like that)
3. There are many methods of heating and cooling your greenhouse

I am lucky enough to have a greenhouse at my disposal and intend on using it for next winter. I just have to make a few adjustments and that is where I was hoping I could get some guidance from the community.?

My greenhouse is a simple wood frame with the dimensions of about 6’ width x 8’ length x 10’ height. I have polycarbonate sheets on the exterior and there is no ventilation yet. No heating as well. I have attached a picture for reference. I have access to power and can make any upgrades that I need.

I am a university student and I can’t be home for the winter so I want this to be a self sufficient as possible. If the power goes out or something goes south, I do have people that can help me out, but that should be a last resort sort of thing.?

As for heating, I have found this ( ) which is both a heater and a cooler that is supposedly able to keep things under control in ranges from 0-26 degrees celsius. Has anyone ever used one of these or would have any suggestions for better heating/cooling options?

I could also introduce vents to prevent over-heating but I’m not sure if those are able to be autonomous. Can I link these all together with a heater, a temperature gauge, and the vents to all work harmoniously??

To help with the overheating issue, I was thinking of lining to interior with some sort of opaque, insulate material (TBD) to keep the sun out and save on heating costs. Does anyone know what I should use for this? Just plywood? Reflective aluminum roll insulation? Styrofoam??

As you may be able to tell, my thoughts are kind of all over the place and I haven’t come up with a sure fire solution as of yet. Any help would be very helpful! Thanks in advance.?

Cheers
Haden?

Do not bother cooler. In summer your trees should be outside in heat and humidity, not in dry cold air from an AC.

I keep two sections in my greenhouse. 1/3 is well isolated with transparent and heated to about 5 c. There I keep my non frosthardy trees. In the other 2/3 is non heated for my favorite hardy trees. Most trees is outdoors all year. But I am in a warm and cosy western sweden where prolonged freezing never last more than 6 weeks.

If you haven't allready, check nigel saunders on youtube. He is also in canada.

Tropfrog wrote: . But I am in a warm and cosy western sweden where prolonged freezing never last more? than 6 weeks.
.

I am in warm and cozy Alabama where freezing rarely lasts more than 6 hours.

Ok thanks for the insight. It's much appreciated.?

I have some larger natives that I have collected here in my area and they seem to do fine in the unheated cold frame the I have. The only trees that would need some hep through the winter are the ones that are smaller and/or the non-natives to my area that are used to warmer winters.?

The only reason I asked about cooling was to keep the greenhouse from getting too hot when the sun comes out. The swings really cause harm. Do you think blocking the light in my greenhouse will prevent these large swings??

Thanks again
-Haden

Oh boy I wish!! lol

I do not have a chillier in my greenhouse and that works perfect. In summer when the sun can overheat the greenhouse ther are no trees there.