It's a datura. They should be putting on loads of growth during this heat. Does it have any foliage? If so just leave it be. You can give it some fertilizer, maybe some ST and or B1 and kelp extract. They aren't heavy feeders like brugs and don't seem to need as much water either. If there's no foliage make sure it's still alive. Daturas are so easy to grow from seed. Don't bother buying datura plants again. You can find lots of people that have extra seeds.
Karyn