I've got a little container that looks just like this except mine are a little older and have started growing hairlike thorns out of the top. Its fun watching them grow, although slowly. Mine like to change colors from green to pink and back
Obliguhl, you might have to put them in more light, it didn't take but five days or so for most of mine to pop up but I took them out from under the florescent and placed them in the windowsill and about a month after the first ones popped up I am still getting new ones here and there.
'Little spider weaves a wispy web, stumblin' through the woods it catches to my head. She crawls behind my ear and whispers secrets. Dragonfly whiz by and sings now teach it.'