Hi all, zone 9b, Southern California here.
Last week, temperatures dropped briefly into near freezing, around 33 to 34° f. There was also quite a bit of wind.
Immediately after this, my grafted black sapote, approximately 3ft tall, had its leaves turn black, shrivel up, and many of them fall off. The underlying trunk and many of the larger branches look okay. I'm rather discouraged by this as a tree has been a champ and didn't seem phased at all by cooler weather, and I also have protected it with a bag during the cold front, but alas to no avail.

Any suggestions on what I should do with what remains? Throw it out? Wait and see if it grows back? Bail on the black sapote in future and plant something else? It handled the summer heat without any issue, put on a ton of new growth... But this cold was only near freezing for a couple of hours and seems to have done it in.
Thank you!