Cut your seed potato into several pieces, making sure each piece has several sprouted "eyes". Let the cut pieces sit for a few days to harden them off. This will keep them from rotting in the ground.
Place a few inches of soil in your container and place 3-5 cut potato pieces on soil. Cover with soil.
Potatoes grow quickly. When 3 or 4 inches of the potato plant shows above the soil, cover completely with new soil. Be sure to water well.
Plant a new container every 2-4 weeks for a continuous crop. The container in back is about 5 weeks along, and now filled to the top with soil, and the front one is 3 weeks along. When the leaves die and turn yellow, the potatoes are ready. I expect that first bag to be ready in a couple of weeks.
Here are onions planted in a ceramic pot. Plant an inch and 1/2 deep
Cover with soil.
Onions an be used as young, green onions, or allowed to reach full size. Make sure to use some of them young so that the others have space to reach full size.
These are my mixed salad greens growing in a ceramic pot. They don't like hot weather, but you can plant them again in the fall. You can plant potatoes all summer long! Potatoes do best when daytime temperatures are between 50-80. There are over 1000 varieties of potatoes--most grocery stores offer 3 or 4 varieties .
For more gardening ideas, check out pioneerliving.net