It really depends on which veg you like to eat but it is possible to grow veg to last all year if you have enough space to grow a range of crops and to be able to rotate crops as it isn't advisable to grow some crops in the same soil year after year without a break. You could grow enough potatoes to last all year but you need quite a bit of space to grow them in and there's always a chance that maincrop potatoes could be hit by blight and you may lose them all, you would also need somewhere to store them in the correct conditions too. Cabbage will grow all year as long as you use the correct varieties for each season, beans are easy to grow and can be stored, also carrots can be stored, fruit can be made into preserves or pies which could be frozen. Of course there's always the question is it more cost effective just to buy veg from the supermarket than to bother growing it yourself but I always try to grow as much veg as I can no matter what the cost implications are.
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It really depends on which veg you like to eat but it is possible to grow veg to last all year if you have enough space to grow a range of crops and to be able to rotate crops as it isn't advisable to grow some crops in the same soil year after year without a break. You could grow enough potatoes to last all year but you need quite a bit of space to grow them in and there's always a chance that maincrop potatoes could be hit by blight and you may lose them all, you would also need somewhere to store them in the correct conditions too. Cabbage will grow all year as long as you use the correct varieties for each season, beans are easy to grow and can be stored, also carrots can be stored, fruit can be made into preserves or pies which could be frozen. Of course there's always the question is it more cost effective just to buy veg from the supermarket than to bother growing it yourself but I always try to grow as much veg as I can no matter what the cost implications are.