Self-sufficiency is very subjective! It greatly depends on the eating habits of each and the years, if we make preserves, or freezing, if we have a cellar to keep root vegetables ...
Some years, I sometimes throw (uh sorry! Compost on the surface in the vegetable garden) some very successful vegetables and other years, that chi!
Regularly, I crumble under tomatoes (18-20 feet for 2 people), zucchini (2 feet), pumpkin (5-6 feet or 18 or 20 pumpkins, I don't cut them), 60 feet of potatoes (even the bad ones years is enough), radishes I do more because they bite and are glassy but at the time a sachet made me the season (but that was before when the sachets were well filled, now I have the impression to buy air, the number of seeds being reduced like skin of sorrow!)
5-6 cabbage (butter and Milan), 3-4 Brussels sprouts, 3-4 red cabbage, 4-5 kohlrabi, 4-5 celeriac, 5-6 meters of carrots (I say that but last year I thought I had missed my carrots, I redid a row 3m and a little later, forgetting that I had already redid a row, I re-re-made a 3rd row of carrots: conclusion, I mulched my garden with carrot tops
2 feet of basil (but this year, I make 5-6 for pesto, Didier gave me an idea last summer.
4-5 feet of chervil (I love with oil potatoes and oil herring, it's very healthy!
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This year, I try 6 feet of sweet potato (cuttings I made with a commercial sweet potato that I had put to germinate), and physalis (excellent in jams) a row of peas 4m with the method of which we had talked here 2-3 months ago (sow very thick, the whole package on 5 m, it works thunder, I would make you photo if you want, they are flowering.
Strawberries, I have them everywhere! old strawberry plants even come out under the hay this spring when they had already produced 4-5 years! The hay gave them a facelift, flowers galore, very green, stiff, thick leaves ...
Green mangetout beans, I make 3 to 4 times from mid-May to July 14: 5 or 6 pockets of 5 to 7 seeds each time.