I pulled the oxalis. It seems to hold pretty long. The oldest of the two blooms in the first pic was open for about 3 weeks before the other one opened. Right now, I have two new blooms open on the same spike and a branch has formed with a bud. This plant is very prolific and holds blooms well.Mine climbs, too. How long does yours hold two blooms on one spike? And I think I might just have an oxalis as well!!!