Thanks guys. Your point about animals is well taken. I plantedd some bursa in one of my test plots and had half of it damaged by raccoons. I'm thinking they smelled people on it and ruffed them up. They stopped when they got through 3 or for and realized there wasnt food there. I think that's going to be the biggest hurdle with small plots -- total loss due to random bad luck. Fewer number of plants equals more per plant risk.
On the bright side, I just found a spot that looks really promising. It's nestled between a parking lot bordered by red cedars, a woodlot, and the fence next to the highway. It's virtually out of side by everyone, no trees, and not too dry or too wet (the difference is inches in elevation in south florida), and gets nice sun exposure. If I filled it up it would hold hundreds of plants (I'm not going to do that..). This could be a game changer for me. I'm pretty pumped. Now if my sprouts would just grow a little faster.