I have one and am still pulling them up like
weeds around the yard,, if it's outside and the wind is strong enough to blow the babies off, you'll have sprouts
growing where you don't want them,, I brought mine in in the fall but oddly enough they were
growing everywhere in the surrounding area I had out side,, the next
spring,, it snowed a couple of time and got one hard frost,, but I had enough leaves on the ground to hold the heat in I guess,, a couple of starts I found way across the yard,, so who ever named it Mother of thousands was No joke,, LOL,,,,,,,,, Btw the blooms on these are outstanding and last a lonnnnnng time!!!