I have been murdering them for about ten yrs. I am long time serial killer.
I was serious about buying a lot of them every winter. It is the most reliable flower all winter indoors. I entertain a lot in the winter and they impress my guest. Of course I do not tell them they will be dead by next winter.
You are right it is a slow death. I have admitted I do not like to water plants so it could be lack of water since it seems they start dying after I bring them inside after their summer vacation outside by March they are down to their last leaf.
