Hello,

I've been hoping someone would be trialing this! There are a few growers who have been successful with Satsuma mandarin in tunnels at different scales. However, they use them as a diversified component rather than a primary income earner for operations. For instance, Oso Honey Farms in Corvallis has Gold Nugget Mandarin in unheated tunnels intercropped with vegetables and strawberries. 

As with anything, I recommend running the numbers and keeping the trial within a manageable level. You can expand incrementally if you have good success. 

Yuzu has potential because it is naturally more cold-hardy and more valuable than most edible citrus. 

While people do have them fruiting outside in mild parts of the Valley, more consistent production would be in a year-round tunnel. Even in mild winters, the issue is crop loss during ripening and frost damage during flowering. Hobbyists either have to accept losses during colder winters or pick their crop green (like limes), which may not get them the same return at the market. 

Either way, flying dragon or trifoliate orange rootstock is most likely to succeed. Flying dragon is often easier to source because they are also dwarfing. These relatively cold-hardy rootstocks are important because they discourage the trees from breaking dormancy too early or starting dormancy too late. This helps to reduce the susceptibility of new growth to cold snaps by avoiding the coldest times of year. 

I look forward to hearing how this develops!

Thank you