Beautiful, Parker! What is the size of your greenhouse?

in the Pacific Northwest this type of enclosure can really help. Not so much to protect from freezing (there are only about 2 weeks of that) but to deal with the extended cold/cool season. Citrus can't really put on any growth in 45°F temperatures and that makes for a short growing season where citrus struggles, even cold-hardy varieties that can deal with a short winter freeze. A plastic sheeting enclosure can raise the daytime inside temperature about 10 to 15 degrees, and nighttime temperature by about 5.

is the water jugs in there for humidity?

How cool is that? I love it! Should be able to extend your growing season by many more days and even stick a space heater in there for longer. Then you will be able to water freely too..Don't you just love the feeling of that?

what a wonderful collection Looks like you still have a lot of space ;). Did you treat the straw bale before bringing it in? I guess I would be a bit paranoid because of unwanted pests

After a year or two in the greenhouse these varieties should be able to survive outside (in zone 8 ).

There hasn't been that much trialling of these varieties in the Pacific Northwest and it remains to be seen whether they can grow in the extended cool temperatures that don't begin warming up till May. It may be zone 8 but this climate is not like the South.

All these varieties are cold hardier or equal to kumquat. Kumquat is the cold hardiest of the common citrus varieties (followed by Calamondin, mandarin, and Meyer lemon).

(obviously the pomelo isn't that cold hardy though, and I think the Bloomsweet is only about equal to Satsuma mandarin)

Of course none of these varieties really taste as good as the citrus varieties sold at a supermarket but that's not really the point, if you're trying to grow citrus outside in zone 8. Maybe with a little more breeding they'll get there. They're certainly better tasting than citrange and trifoliate though.

The water containers are to try to hold heat. The water mass can also help resist freezing temperatures inside the enclosure, since as water freezes it releases latent heat. Some people have advised me to paint them black.

Oh, did I mention the leaves of each variety have their own unique fragrant smell? Sort of pungent and deep, sour and aromatic. Not surprising since these have substantially different ancestry than common citrus. I can't wait for the blossoms to form.

Very nice collection you have going.

Here's one from my GH looks like I'll be picking limequats all winter :) the bush is just covered in various size fruit and blooms.

Great to see someone else in the PNW growing citrus, I look forward to seeing how yours do outside, do you plant to keep them out all winter or is this just to extend the seasons a bit? I'd love to put in a green house but have no idea about how to do it and whats needed for our area.

As you can see, because of the Northerly latitude and getting into the Winter season, even in the middle of the day the sun is at a low angle in the sky, so the bottom half of the greenhouse mostly isn't getting any sun. (This picture taken at 12:30)

I took a temperature measurement in there, it reached up to 81 degrees, 1:00pm, clear sunny day. The weather service was reporting it was 52 degrees outside at the time.

The reflective mylar sheet against the wall is there to try to hold in more heat during the night. There's also a 55-gallon water barrel in there for the same purpose.