Let’s tie the tangent with the main series again and talk about seeds.

For many crops, self-sustainability with seeds is perfectly doable, as long as a few precautions are observed. I will illustrate some of those precautions with various crops.

There are multiple species of edible beans; probably the most important are runner beans (Phaseolus coccineus) and common beans (Phaseolus vulgaris). The species do not hybridize, but they both have multiple cultivars. And here the first care needs to be taken – in any given season, only one cultivar of each species should be grown to avoid cross-pollination. Otherwise, the cultivars lose their properties and, for example, one ends up with neither white nor red beans, but with black ones with white spots. Also, bush beans can cross-pollinate with climbing beans, resulting in freaky plants with unpredictable growth. Thus, if multiple cultivars were to be grown together, it would not be possible to save seeds for the next season. But dry beans and canned bean pods both have a long shelf life when stored properly, so it should not be a problem to grow one variety per species per year and still maintain a good variety of colors and shapes.

Potatoes do not hybridize and produce seeds; they are grown from cloned tubers. In theory, it is possible to keep growing different varieties together in perpetuity, as long as one manages to keep the tubers separated. And herein lies the problem of volunteer potatoes. Those are plants that grow here and there from tubers that were accidentally left in the ground from the previous season. A tuber the size of a pea can survive in the ground and the next year produce tubers the size of a fist. And even with crop rotation, it can happen that these volunteers spread underground, and thus the varieties get mixed up a bit. It would never be a big problem, but it can lead to slight inconveniencies, like firm salad potatoes getting mixed in with soft potatoes for mash.

Spelta, wheat, oats, and other grains are generally grown in stable varieties, so saving one’s own seed should not be a problem.

Peppers and tomatoes are a bit tricky. There are stable varieties, and the plants mostly self-pollinate, so it is possible to save seeds. However, cross-pollination is possible, and thus contamination can occur when multiple varieties are grown together. Moreover, there are multiple F1 hybrid varieties that do offer significant benefits, with one downside: saving seeds is impossible, and they need to be bought. Overall, it might be best to find one-two varieties that work best in a given environment, and ignore the rest, if saving your own seeds is a must.

Pumpkins are a headache. There are multiple species, each with multiple varieties, and the species can hybridize together, producing infertile and/or freaky offspring. If wild gourds are in the area, they can introduce genes producing bitter tastes, etc. Saving one’s own seeds is thus inadvisable, unless one pays care to isolate desired flowers, prevent insects from accessing them, and pollinate them manually.

All these problems or lack thereof apply to a wide variety of plants, so a 100% seed self-sufficiency is not as easy to achieve as one might think. But it is possible for the main foodstuffs grown on the five big fields with minimal effort.