No, there’s no 100% guarantee that the seed that you are buying WILL grow into a plant. However, there’s a good chance that it will, if you buy it from a reputed seed bank. Seed banks such as Crop King Seeds and I Love Growing Marijuana (ILGM) generally sell seeds which are of a higher-quality as they go through an intense ‘picking’ process. Some seed banks also offer you a refund or a ‘confirmed success rate’ up to 80-90%.