I like the idea of graphically representing the growing/learning aspect of the daycare. The wheat symbol is OK, but would like to see more ideas along this line. Doesn't necessarily have to tie into a Biblical reference.
The logo itself needs to include purple and possibly some other primary colors. Also, we don't usually emphasis "Harvest" in the title. "Harvest Christian Daycare", is usually one line and "& Learning Center" is usually a subline, so I would like to see something with that emphasis. However, I do sort-of like emphasizing "Harvest" because of the growth connotation that it gives.