I read this super interesting book recently called “landrace gardening by Joseph lofthouse and it was super interesting so I thought I’d share.
The basic concept is that instead of planting heirloom varieties in your garden , that might be adapted to climates vastly different than yours, you just get as many seeds as you possibly can from different varieties, plant them all close to eachother in your garden, neglect them and then let survival of the fittest take its course.
The initial survival rate of the plants will probably be super low and only the plants best adapted to your climate should stay. Save those seeds and plant them again the next year. After a couple of years you will get plants that are very well adapted to your climate, growing season, amount of rainfall etc. because of this you will have to put less work into the crops and get bigger yields.
Another thing he harps on is hybrid vigor. Basically F1 hybrids are popular because they tend to grow better than heirlooms. The reason for this is that heirlooms are highly inbred (the habsburgers of crops) and by crossing them with other varieties they become less inbred and thus more vigorous. So part of the idea of planting all kinds of seeds together is that you are crossing a bunch of varieties to get more genetic diversity and healthier plants.
You will not get very consistent looking crops though (colour, shape etc might all vary) but at the end of the day a zucchini is a zucchini no matter how it looks. And after a couple of years your hardy, well adapted crop will stabilise a little too.
You can also in addition to the natural selection for the strongest plants, select for the traits you are interested in. Only save seeds from the crops that are tasty and have good yield. Or maybe you want pumpkins that store longer, so only save seeds from the ones that take the longest to rot etc.
This way also permits you to be more independent from commercial seed growers and having to buy seed packets every year.
That’s basically the overview of it, but if you are interested in this concept I would suggest you go read the book, it was truly very interesting. I will be trying this out with my own vegetable garden from now on. I’ll update in a couple of years with the results :p