Citrus Species, Yuzu, Yuja

I have found a mature Yuzu tree growing in Astoria, Queens, NYC

I purchased two 2 year old plants from Four Winds Growers which were potted June 2008. My motivation for selecting the Yuzu was both cul...Read Moreinary and its reported cold tolerance. I live in 8b and previous experience with a variety of citrus cultivars was unsuccessful. The plants grew well in the pots and wintered with out a problem. In the spring (2009) one of the plants produced flowers from which five fruits began to develop and ultimately matured by mid December. From the fruits, which are aromatic but bitter, I made five pint jars of marmalade which included the rind and fresh orange and lemon juice. The winter of 2009 in my area had several temperature plunges to the 10 - 12F mark and ultimately killed the plants. I have since ordered and planted 2 more and have also managed to grow 12 from seed.
Observed pests were the white fly and the orange dog caterpillar, the larvae for the Giant Swallow Tail butterfly.
I believe the plants which perished had reached the lower limits of their tolerance plus I was caught off guard with the sudden temperature plunge and failed to provide proper protection.

I have a 15-moth-old yuzu in a pot in Carrboro, North Carolina - zone 7b, in the central part of the state. I keep it potted, thus far, ...Read Moreuntil it gains maturity before risking it in a winter here. It has been happiest in the spring and fall here - a run of near-100-degree afternoons brought growth to a standstill during the summer, though it perked up dramatically when temps fell into the 70s and 80s. Yuzus are very fragrant, with a slightly spicy lime/grapefruit smell, and mine is most fragrant when going through one of those seasonal growth flushes. Not many spines, but the ones it does have are pretty serious looking.

I am trying to start a yuzu tree - after tasting in - great perfume! just wanted to add that it is apparently resistant ro 10F, so it is ...Read Morenot so tender as it is sonmerimes believed.