 Men and women are busy hacking down branches and loading up a donkey with them. The best thing about growing worms is that it's not for too long, Bibi Khan explains. When the worms are a week old they're weighed out and however many grams we get of worms determines how many kilograms of cocoons we end up with. At that stage they all fit on a trestle table in one room but now they've taken over the whole house.