When to Repot a Thanksgiving Cactus. On average, Thanksgiving cactus plants require repotting once every 3-5 years. The best time to do it is in the winter, just after flowering has ceased.

Rebman's been at the museum for over ten years, but cactologists before him began a large cactus collection there, thousands of plants. The museum's plant collection numbers over 165,000 specimens ...

The saguaro cactus is an Arizona icon. A few develop twisted, fan-shaped tops. Here's what's special about the crested - or cristate - saguaro.