Great suggestions. Each of my six plants were looking "tired," as they were lighter green, and growth had stalled to almost nothing. I re-potted all of them three weeks ago. Now, with the larger pots and soil, they have turned a waxy, deep green, and new growth is everywhere.
I've been watering my jade plants once per week, and they've been doing well. But, I thought that perhaps I could stretch the watering to two weeks. I will keep your idea of watching for the signs of dehydration before I water them again. I know you aren't supposed to let them completely dry out. I am only trying to fine tune the length between waterings.
Looks like my new soil moisture probe was a $9.95 waste. Lesson learned. I will try the bamboo skewer right away. I will stay with the 12-4-8 fertilizer, and look to fertilize only 1x per year. My goal is the get the plants about a foot taller, along with an increase in leaves to give them a fuller look.
Thanks Daisyl for the detailed response. MAAB, your 50 year old jade plant is a monster! Very impressive! It looks so happy in that corner of your home.
All good.....thanks again.