Kalanchoe diagremontiana or one of the other varieties?
Quite common to find them growing a a crack...
In fact, I 'rescued' some myself, yesterday

This post was edited by costaricafinca on Sat, Mar 16, 13 at 19:36

Thanks costaricafinca. But it doesn't look like those on the pictures I found about Kalanchoe diagremontiana. Also those Kalanchoe diagremontiana I found don't have a woody stem.

Looks like a type of Crassula ovata (Jade Plant) to me.

Thanks seedmoney. It indeed looks like a jade plant from the pictures I googled. Some of its leaves are not grown in opposing pairs, as described by Wikipedia, but I guess some leaves are just lost or eaten by bugs.

if its jade.. its not going to proper in that spongy peaty media..

trust me.. i just killed one .. lol .. and mine cost money ...

look for a cactus mix..

ken

Thanks ken_adrian, good point! Will try to look for some better mix for it tomorrow.