Frugal gardening: Grow OP veggies and save your seed. Excellent varieties to start with: Fortex pole beans, Suyo Long cucumbers. You can look them up on Fedco Seeds or Johnny's select seeds web sites. Many squash varieties are also OP. If you grow only a single variety from one of the squash families: Maxima, Pepo, or Moschata, your seeds should breed true. (as long as your neighbor's garden is not too close.) You can grow a single variety from each of the 3 families, and they will not cross from one family to the other. Tomatoes do not usually cross, as long as there is a bit of distance between plants, so you can save OP tomato seed with fairly good reliability. Beans also easy to save w/o cross pollinating. Parsley will come back the second season, for a 2 year harvest followed by a huge set of seeds. Let it go to seed, and you may never have to plant parsley again. Dill sets seed the first year, again... you may never have to plant again. Let lettuce go to seed. Makes the garden look "weedy for a while", but will produce a wonderful crop the next season. Just tear up those plants at the end of the season and toss them where you want the lettuce to grow next spring. Radish and calendula go to seed in my garden. My chickens love those seeds so much that I have to harvest some (calendula) seeds myself to be sure there is some for next season! I don't bother with radish, b/c it doesn't breed true all the time for me.