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Why do some perennial flowers multiply year after year, and others don't?

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I have 3 differant kinds of lillies, I don't know which kind, but the ones that smell real good don't multiply, I planted 1 plant 5 yrs ago and there is still only one plant, I have 2 other kinds that don't smell at all and I planted 1 each of them 5 yrs ago as well and I have like 20 of those kinds now. Anybody know why that is