Euphorbia Geroldii Plant Care. As the plant matures you can expect it to reach up to around 60 cm (24″) tall. Photo by @ref_garden via instagram #1. Caring For Euphorbia Geroldii: Thornless Crown Of Thorns! from www.ohiotropics.com As the plant matures you can expect it to reach around. All you should know about thornless crown […]