I purchased one of these last summer (the tag said it was from Monrovia). I placed it in a pot and put it in front of a rock wall where it received a lot of sun. I overwintered it in the house where it was in a window that receives morning sun and when the weather warmed up i took it back outside to its original site.

The plant has grown very well and has produced many new balls and received lots of compliments but it has not bloomed. I do know it had the remnants of a flower when I purchased it.

Are there any "tricks" I can use to get it to bloom next year?