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There are two main varieties: bush beans and vine (pole) beans. They are often labeled determinate and indeterminate, respectively. Lima beans are annuals, which means that they grow within a single season once a year. Find lima bean seeds at a local nursery or garden-supply store.  Bush beans tend to mature more quickly. They are called "determinate" plants because they yield all of their beans at one time. The bushes grow up to 30-90 centimeters high. Stick to bush varieties (like Henderson or Fordhook) if you're growing lima beans in a pot. "Indeterminate" vine varieties mature more slowly, but they yield a better harvest per square foot, and they tend to have fewer problems with disease. On a pole, a vine plant can grow 2-4 meters high. Consider growing this variety in a small garden. Wrap your lima beans in a wet paper towel, then seal the towel inside an airtight plastic bag. Let the seeds germinate for a few days, until they sprout stems and small roots. Each bean should feature one prominent, noticeable stem. If you live in a region with a short growing season, start the seeds in seedling pots roughly 3-4 weeks before you expect the final frost of the spring. Bury each seed beneath 1-2 inches of loose soil. Keep them in a warm, moist environment, no cooler than 60° Fahrenheit and no hotter than 70°. Consider using a biodegradable peat or paper pot. Lima bean seedlings can be delicate and difficult to transplant, so it is safest to use a pot that you can plant directly into the ground. Do not try to plant a clay or plastic pot into the ground, as this will limit the plant's growth.

Summary:
Acquire lima bean seeds. Germinate beans in a bag. Start seedlings in a pot.