Many of the plants referred to as cultivars had humble beginnings as mutants. Called "witch's brooms" or "sports", these are parts of the plants that appear spontaneously and do not grow if planted by the seed of the mother plant. These "witch's brooms" are then grafted onto rootstock, usually of the same species, and reproduced. Because even the best grafter will lose plants, the cost of these plants are high than those produced from seed or cuttings.
