[The turtle's already produced a piece of chalk and has started to mark out points. He considers before simply mystic-tech'ing up a frame that fit within the points he'd marked out so he could trace along the outer edges.]

Well, technically pests shouldn't be a problem provided nothing's lurking in the dirt or anything you might transplant. But there are simple enough remedies for those problems. But yes, containing the dirt will be easy enough, and if you have grass then it'll keep any loose earth from spreading around. We could put in a pathway or something too. Actually, what all did you have in mind for putting in this garden?

[He waves a hand at Poinsettia for them to go ahead with answering while he goes over to start getting measurements for the drawers.]