Last June I published two cactus pictures, including one of little prickly pears living on a rock.
Apparently, bacteria are the secret to their success.
"When a seed falls in bats and bird droppings onto barren rock, it contains all the bacteria it needs to pioneer colonisation of that rock," says Dr [Yoav] Bashan [of the Northwestern Center for Biological Research in La Paz, Mexico].
Cactus is one of my favorite plants to put inside the house. It is true that cactus also helps produce soil from the rock. Hey, you want to save a dog, check this out: http://apps.facebook.com/save-a-dog/
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