Walnuts grow on trees and are ready for harvesting in September. When its green outer shell turns brown it starts to crack and the walnut gets the form we are used to. Generally, walnuts are the size of a small lemon and weigh around 10-15 grams. When you crack open the shells you will see the actually edible part which looks like two halves of a human brain. If you are looking to buy walnut wholesale of certified organic products ask for the possibilities.