This year 4 for my raised beds. I started year one with a single one for tomatoes and yellow crook neck squash. Was so impressed year two I added two more from recycled lumber. Been working at over coming problems I found like tomatoes plants 7 feet tall, taught my self to prune them and keep the tops clipped after they get 5 to 6 feet tall.
egg plant did great both the normal blob looking ones, and the Italian type.
I stopped the growing of the egg plant even one plant produces more than I can use as they all seem to come in at the same time. I had a hard time giving them to people who would use them.
Al
