Tempting though it may be to ignore everything else but the delicious flavor of our home produce, it is important to bear in mind that all living things – which means, to a greater or lesser extent, pretty much all of our food – follow a cycle in their growth patterns. With crops which are annuals, such as most commercial crops and many salads and vegetables, if we harvest the food but not the seed we are breaking this cycle.
In order to create an even more efficient system, we can harvest the seeds from our vegetable plots and re-seed them next year, ensuring prolonged biodiversity and more economically liable growing for us, as we don’t have to keep buying seeds.
When you save seeds for planting and legacy from year to year you should plant only heirloom seeds. There are some useful resources out there to help decide which vegetables will be most successful. I have researched many sources including universities. Here are some tips on seed saving from experienced gardeners and knowledgeable individuals and organizations.
However tempting it might be to fill your garden with a blossoming diversity of different types of vegetables, in terms of actually being able to save that diversity for coming generations it may be more helpful to grow just one variety of each different crop at a time.