Hi Andy. I'm quite interested in your trial of this (and any other) trees. I'm working on similar trials, but am awaiting one more year's growth for Florea. (Also I'm in a colder zone, 5a). Can you describe how the tree is situated, relative to exposure/protection from prevailing winds? (Which I assume to be westerlies, though obviously localized wind patterns matter most).
a) What sort of wind block does it have? (relative to N, E, S, W, and wind direction)
b) What sort of sun exposure does it have where you've got it planted? (e.g. is it southern slope, with direct sun / shadow for what parts of day?)
c) Is it close to any sort of heat sink? If so, what? (e.g. a brick or rock wall, southern exposed for heat?)
d) How well-drained is the soil?
From my experience, and bolstered by things I've read from others among us cold-climate growers, well-drained soil is a must (it's a killer to have roots in sopping/saturated conditions in a freeze, seemingly especially so when there are multiple freeze/thaw cycles, but even one solid freeze in very wet soil can kill roots... of course if they're deep enough to be below your freeze depth that helps :-)). Protection from cold dry wind seems to be another important factor. Variety matters (and Florea seems a good choice to try). Actual temperatures will matter too, especially dynamically (the temperature curve over time... in my opinion passing through the 28F - 34F range multiple times in both directions, seems to be a very damaging set of events, even compared with steady temps that are below 20F). (When those occur matters too, relative to how green the wood is in the fall, and again in the spring when you've got fresh green new growth). There are other posts about these kinds of variables, by me and others (e.g. robertharper and a few other members too... quite possibly you're one of them :-).
So in any case I'm quite interested to see how this goes for you. Thanks for documenting it all and posting it here on the forum.
Mike central NY state, zone 5a