Sustainable gardening. I leave a couple onions, leaf lettuce, kohlrabi and more go to seed. The seeds provided by my own garden are perfectly suited for my locale and it is fun to share them. Usually gets others started in the same thing!
Parisian Carrots, a great little round carrot that is a nineteenth-century French heirloom. It excels in clay or rocky soil where other carrots have problems developing properly. They say it works great for containers.