Beano 2. They will still produce fruit beyond year 3 but they produce less and less each year. The plants get woodier also. First year plants crop lightly also so have 3 rows or beds as OldCompostHeap says. Keep renewing and ditching each year. This is done on the cheap as old plants produce new ones each year. Hope this is of help.
ewhy thanks i just use them in the garden for the tortoises to eat to be honest so thats really good to know