All of my trees are flushing new leaves now. I've noticed a few spots where the cluster of new leaves from a bud will shrivel up and fall off while still ~1cm in size. This is only a tiny minority of new growth, maybe 1% on various trees. Is this a normal thing? Any idea why some leaves might be killed off so quickly?
The only thing I can think of is perhaps these baby leaves are extraordinarily cold sensitive. Prior to the spring growth flush I was keeping the minimum temperature in my greenhouse at ~33F. Now with new growth and flowers I start the heaters when its ~36F, just to be careful. It should not have dropped below 35F, which I thought was a safe temperature even for tender growth.