marie
to get a true identical plant you cannot raise from seed if there is any other pollen around due to cross pollination. if they cross pollinate the ones grown from seed can look different. So most growers are growing and selling different ones. they take a small one grown from seed. and then take a cutting of the one (like the purple) "mother plants" and graft to the small one grown from seed. then you know its going to grow to look like the mother plant and they know that it will be a purple one or what ever the mother plant looks like.
hope this clears it up.
mike
