After some trial and a lot of error, I finally manage to keep the greenhouse frost free. But there were quite a few freezing nights that obviously were tough on my citrus. Now there is splitting along the trunk, but I still have hope. Maybe I’m a dreamer, but at this point I need something to believe in.
That big lemon is slowly turning yellow now, but the smaller ones are bright green so I don’t expect them to be ready until spring - if they are still hanging on. I think if I control the moisture, the tree should cope with quite a bit of cold. Air temperature in the greenhouse will go below zero, but I doubt the soil will freeze. @gjones @jacaranda
Thank you @cyndi, that was a really useful link! You seem to have information on just about anything! I will be trying one of the lemons soon, so exciting! There is also a green one and some tiny beginnings of fruit as well, so hopefully I won't mess this up - imagine having my own (small) supply of homegrown lemons, that would be such a luxury!
Thank you @columbiariver and @gjones. I have always wanted a lemon tree, but I had decided it was too extravagant to just go out and buy one. I do have a citrus that I started from seed about 15 years ago. That tree looks great, but chances of fruit probably aren't great, as I used a clementine (I think) from the supermarket, and I'm sure they are accustomed to a lot more light and warmth than I can give.