Thanks!

The ultimate dream is to build a large enough greenhouse to support a small dining area for a restaurant. This will be on a property with an organic farm and aquaponics greenhouse as well. :)

Use lots of water barrels to store and release heat.

http://www.greenhousegarden.com/thermal-massheat-storage

Thanks, Mike! Great idea

paint black on the inside... or, use panels that are reversible... white on one side, black on the other (switch during winter/summer)

another idea is to build up earth on the notrth side, and even partially on the east and west sides, leaving southern (sun) exposure

the earth will keep the temps stable.

you also dont have to grow the most sensitive ones

like Cocoa, which needs 40F, or death...

Loquats can take 15F i think, Jujube also.

rocks (as well as bricks and cement) hold heat overnight.

i am always pushing boundaries growing papaya in New Orleans

The most important thing i do is create a micro-climate.

Keep plants close to each other.

share space...

(tall plants, shorter pants, ground covers can all be in the same area

without competing for light.)

I have the same dream. lol I'm in Renton WA. I'm keeping a blog about the fruits that I grow. http://seattlegardenfruit.blogspot.com/. My pomegranates grown from seed survive the winter. I have 2 yr papayas. I keep jaboticaba, miracle fruit, longan, june plum, sapote, In a little greenhouse. I have guavas, papayas, moringa, cherimoya, and jacaranda out in the sun at the moment.

I live in zone 7b (Raleigh NC) and keep a large collection in a greenhouse. Fruiting tropicals is possible but you have to keep in mind that plants that come from near the equator are not adapted to long summer days or short winter ones. In the wild they have pretty much 12 hours of light and 12 hours of dark all year - so when you put them in a long summer day situation some of them freak out and fail to bloom or fail to set fruit. A lot of the stuff on your list will not require 70 degree winter days, just above 50 usually does it. Citrus should do fine, just remember that most of them have long ripening times - like 14 months for grapefruit. Guavas do fine for me but it is hard to get good ripening on the tree, I have to harvest a little early and let them finish on the kitchen counter (they start to rot in the greenhouse). Bananas and Papayas look great but again, take more than a year to ripen. Figs should handle it fine but keep in mind that some people are sensitive to the latex in their stems and leaves so you wouldn't want to place them where they would get bumped into. Kiwis are gorgeous vines but they have to be pruned all the time or else they'll take over the world.