Foraging - there are plenty of fruits around that just grow wild!
Know how to preserve and save all your fruits!
Knowing the trees and plants located on our land and their uses with respect to lumber, edibility, medicinal value etc.
Self Sufficiency isn't only about feeding yourself. It's also about being able to take care of oneself as far as:
Health and wellness (essential oils, clean water, homeopathic remedies, cleaner recipes, and more)
Providing and maintaining ones home as simply and affordably as possible
DIY repairs for home and vehicle maintenance
Heating the home in the winter (wood)
Providing clothing for your family (wool from sheep, skins from animals, etc.)
Using and reusing everything that you can - in other words wasting nothing!
Knowing what resources are available near your home and how to use them in emergencies (alternative sources of water, shelter, heating, lighting, communication, food, trees and what they can provide, etc.)