I have been growing some larch for a forest planting. I started in 2018 by purchasing 10 American larch plugs even though I am in zone 7a. I still have all 10 of them. Then in 2019 I decided to add some more for a larger forest. However the American larch were nowhere to be found so I opted to go with 10 Japanese larch. After all, these supposedly are more tolerant of warmer conditions. Well I managed to lose 4 of them in an August heatwave. So in 2020 I went back for another 10 J. larch. By the spring of 2021 I still had all 10 American larch and 16 J. larch. I repotted all but the 6 J. larch from 2019 since they were very large and in large flat pots. All 10 American larches did fine but I got some sunburn on a handful of the J. larches. They limped along for a couple of months and finally 6 died leaving me with 10 American and 10 J. larch. Then over the fathers day weekend one of the big J. larch wilted and died. Initially just the growing tips wilted, followed by their needles going limp. Finally all the needles fell off yesterday leaving only a few small green buds which actually look like they are wilting. I have always attributed this to heat stress but this last one is a puzzler since it was in a group of very vigorous large J. larches. At this point I still have all 10 of the American larch, 5 of the large J. larch from 2019, and 4 of the smaller J. larch from 2020. Does anyone have any experience with J. larch and can comment on this? Is this the sudden larch death I have heard of? Below is a photo showing the most recent loss next to a healthy tree—the two looked identical until last saturday.