Mother should be grown from seed every year, for their genetic intergity begins to decline. MJ is an annual plant, being its life cycle in nature is one season, though growers have maintained mothers longer. Remember, clones aren't just a couple of weeks old, but they are as old as the mother. Remember to allow mothers to rest in between cloning, flush mothers for several days before taking cuttings or foliar flush nitrogen out of would be cuttings. Would be cuttings should be flexible, confirming low nitrogen and high carbohydrates to insure good rooting. Older lower branches contain more carbohydrates.