My Dwarf Jade plant has been dropping dozens of leaves (both good and bad leaves) every day for the past few days. It receives bright indirect light. What is the case? Is it overwatering or underwatering or some disease?
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Looks like over watering. The soil itself looks wet to me. The elephant's ear, like all other Jades, can use very little water, so you can usually just stick to weekly or even two-weekly watering schedules.
This is a very resilient plant, so if this is the first time it happened, just let the soil dry and then water later. If the leaves fall off repeatedly over weeks, it means you have root rot. The plant can recover from that as well, but, it is best to not let it get there.
If you have a sunny spot, put it out for about 5 - 6 hours over a couple of days and the soil should dry out.
I have raised almost every kind of cactus and succulents in my sixty years of loving them. In almost every case I have found that watering once a month is plenty and you will never have one rot, or root rot. If you’re somewhere very hot you can step it up but it’s been a never fail rule for me. I use the first day of the month so I don’t forget.