Jade plants don't require pruning for the sake of health. Large specimens become quite heavy, but resort to natural self-pruning in the absence of regular maintenance. Very long, firm stems that appear to be healthy may drop from over-grown branches in such cases. Your Crassula argentea may simply grow so large that you feel the need to manage its habit, with some trimming. Jades respond well to pruning as much as 25 percent of the total foliar volume at a time. These beauties can be safely pruned anytime throughout the year. The best time for this is while the plant is actively growing.
Gently snap off any stems or leaves that feel flimsy or loose to you.
Use a clean, sharp knife or pruning shears to remove any dead, damaged or diseased stems.
Look the jade plant over carefully to get a good idea of which remaining healthy stems or branches that you want to trim off. Keep in mind that two new stems will eventually grow in place of each one that you remove.
Trim each stem back to a node of a lateral branch. Make your cuts clean while you're pruning, and don't leave any stubs.
Cut larger limbs back flush with the branches they're growing from.
Clean up any trimmings or other plant materials that have dropped onto the topsoil. Removal of this debris will help ward off pests and diseases.
Set the trimmed stems on your counter overnight to allow the cut ends to heal. Plant them in damp sand to root new jade plants.