每日吃瓜

Hi All,

I purchased a small cherry tree a few weeks ago. I noticed this morning that the tips are browning and Im not sure the cause. Im not sure if it has to do with acclimating, watering issues, or if it's a disease. I tried researching a bit but didnt find anything definitive. The tree is in good bonsai soil, outside . We have had a few cooler nights here in Massachusetts (high 30's/low 40's). I dont think its frost damage, but I suppose it could be. Maybe fertilizer burn?--Ive barely fertilized it yet though.

Anyone familiar with cherry trees or other trees with this issue?

Pictures attached.