John F Dean wrote:I find this to be a fascinating link. Although I live in zone 6, I have a high tunnel that I will try to plant in.
I know right! I keep going back and taking a look at the list... and am considering getting one of those super cold-tolerant varieties.
They may not be "grocery store" edible quality... HOWEVER, I hear that some of them are amazing for cooking. I love to fish... and LOVE Ceviche!!! (Citrus required)
Plus side is that they would literally be almost zero maintenance for me in my climate... and won't need protection.
I will keep my Owari Satsumas and Lemons up against the South side of the house. The other more cold-tolerant varieties can go out with the rest of the fruit trees.
For you, though, I have some
experience from growing citrus in a
greenhouse (for only one Winter though sadly). My
greenhouse I had about 6 years ago (and 5 homes) was completely empty... with not extra thermal mass or automation for protection. Anyways, the temps outside got down into the teens for a brief while. Temps in the greenhouse got down to the same for a brief period only. My baby "Improved Meyer Lemon" came out without a single bit of damage. When mature they are only supposed to be good down to 25F. I think the complete lack of wind made a major difference.
That being said, a few years later and that more mature Meyer Lemon survived several nights down to the upper teens OUTSIDE in the weather (different home). It was completely defoliated and lost all of it's upper branches (all green turned brown and died). I thought it was dead but it came roaring back to life from it's trunk the next Spring. Late the next Spring.