What can you grow in the holes of cinder blocks?
I've been reading all the threads on this forum about making raised beds out of cinder blocks, and I'm really taken with the idea.
There's another thread on this forum about the measurements of beds made out of cinderblocks, and my question is closely related.
My question is, What can I grow in the holes? I remember reading that someone (I think it was Ray) said that not much would grow in the holes. Someone else said they grew strawberries. I've read about growing bush beans in the holes of cinder blocks (one garden book suggests 4 bush beans to a hole, which seems too much to me), and herbs. Others mentioned pest deterrent plants like marigolds. I was wondering about nasturtiums. . .
Would the smaller leaf lettuces grow in the holes of cinder blocks? Mustards? Parsley? What else would grow in them?
Do plants growing in the holes need a lot of extra watering?
Basically I'm trying to decide whether to consider the holes a "serious" growing space. It's an issue for me because I don't have a lot of space for the beds, and because I'd like to keep everything in the beds easily reachable (this was discussed on another thread too.)