well the OP was asking about seeds, and it was pointed out that seeds do not come true many times. So then the fix may be to use cuttings of plants you already have to get more plants and that way you would know they would be the same kind/quality. But then it was pointed out that cuttings do not always perform true to the parent plant. So the question here is--how does one get more plants of the same kind and quality without buying pricey seeds or flat out having to buy the plant again?
