Cycle: A = annual, B = biennial
Pollination: Self = self-pollinated, Cross = cross-pollinated by another plant.
Isolation Distance: recommended distance by which different varieties must be separated to prevent unwanted cross- pollination.
Seed Longevity: Averages, not guarantees. Seed longevity depends on the condition under which the crop was grown and how the seeds have been stored.
Saving Ease: All vegetables that are self-pollinated are easy to save. Vegetables marked with an asterisk (*) are easy to save, but are cross-pollinated. Since they cross, you’ll have to learn more to make sure that you get plants like the ones you started with.

A Note on Seed Health: Seeds from cross-pollinating plants that are isolated in small colonies can become inbred after a time, so it is recommended that they be planted in large enough colonies to avoid inbreeding, at least every few generations. Recommended minimum populations to maintain vigor and avoid inbreeding depression (# of plants per colony): 25 cucumbers, squash, melons; 50-100 radishes, brassicas, mustards; 200 sweet corn.