My first rhubarb crowns

[enchant]

I ordered three Victoria rhubarb crowns from Johnnys Seeds.
http://www.johnnyseeds.com/p-7757-victoria.aspx
They just arrived, and the instructions say to put them in the ground as soon as possible. My plans are to dig a new garden for them, but that won't be ready for a few weeks. In the meanwhile, I filled a large planter with compost and planted the three crowns in that.

At this point, they just look like dead sticks that you'd find on the ground. How long before I should see any life? I understand that I won't be harvesting anything this year. I just want to know at what point I should get concerned if I don't see any activity.