It certainly is. Joe loves it... it's a shame I only discovered this after he ate 3 plants within a few hours of me putting them in the garden! They keep making valiant attempts to regrow, but he eats them straight back to ground level again!
Some of mine eat it,some wont have anything to do with it. It is easy to cultivate new plants, By either from leaves or whole stems, I just cut some stems to make a few more plants a couple days ago. Let the cut end cure and stick in some soil. The leaves, pretty much the same thing, but you will start with much smaller plants, but if you want a lot of plants in the future do the leaf method. Here are the pics of what I cut and the plant they came from.