Very Old Jade Plant . When root rot becomes established, the first sign the jade plant owner sees are generally those that exhibit themselves in the leaves and stems. Although pruning scares many people, it is really the only leggy jade plant fix. I got this jade plant from a street sale a month or so ago. These from www.reddit.com The insulting phrase old fashioned might be slung around when describing this crassula, but as with. Jade plants thrive in temperatures between 55 and 75 degrees f, but they only need average humidity levels. Place the pot in a basin of water fro 10 minutes to allow the water to infiltrate the soil properly.