I was really surprised this year. A couple of the "Bog Witch" pitchers are reaching around 24 inches. Thanks for the compliments. It's been a hobby for years. I've built several bogs over the years for me and one for a nature center. It takes a few hours of labor. Mine are half above and half below ground meaning I dig approximately 16-18" below ground and add 12 more inches above ground with boundaries. I wish I would have used a more natural stone now though.