Combine this technique with multiple layers like this: http://www.gereports.com/post/91250246340/lettuce-see-the-future-japanese-farmer-builds http://www.gerepo

Combine this technique with multiple layers like this: http://www.gereports.com/post/91250246340/lettuce-see-the-future-japanese-farmer-builds http://www.gereports.com/post/91250246340/lettuce-see-the-fu... edit: fixed link....