Greenclaws

Greenclaws was a big green monster who lived in a greenhouse. Every week, Iris would visit Greenclaws. They would put one of Greenclaws' fabulous seeds in a plant pot, put the plant pot inside a secret growing place in the Riddle Tree, wait for Owlma (a mechanical owl) to alert them that the plant was ready and then open the tree to find the plant had grown into something bearing unusual fruit. (en.wikipedia.org)