To make the ball planter I use 2 half sphere molds I buy on ebay. ($20 a half + shipping) I bolt the halves together and then use an inflatable playground ball inside. I start with a 10” ball so the planter ends up being ¾” - 1” thick. You can make the walls a little thinner by inflating the inner ball more. After the hypertufa sets, I deflate the ball and pull it out. I started making these planters this past summer so it is about 8 months old.
