Q.How can I treat jade plants that are losing all the leaves
My Jade plants are losing all the leaves like crazy and that never happened to me before. They were always very healthy but I left them to take too much rain this summer a guess (they are in the pots). I really don’t know if that was the cause of it.
Yes, probably they've got too wet, and the roots are dying, so the plant is losing leaves both because there aren't enough roots to support all of them, and because there may be some fungal diseases moving through the plant tissues. Here are some tips for drying out and saving your plant: https://www.gardeningknowhow.com/plant-problems/disease/treating-root-rot-gardening-tips-for-housplants.htm