Unusual for healthy looking leaves to just fall off - at least they look healthy in the photo. And so many at the same time. Are they firm? I can't tell if pot has drainage hole(s)?

Is there a chance someone, or a pet or some other critter, if outside, has 'brushed' against it?

Oldest leaves eventually dry up, shrivel and fall off, but most often just 1 at the time. Leaves that are sill green and looking OK don't.

I thought so too. Yes they are firm and yes there are drainage holes in the bottom of the container.

No chance of that. Could it be from a change in temperature? I am from Ontario aswell, and the temperature dropped from 30C to 15C over the weekend (during the day, so it's colder at night). I do leave my window open, so the plants wouldve gotten cold air. This is all I can think of.

I am in Ontario as well, and have all plants outdoors...last night, temps dropped to below 10*C!, and apparently around 4*C for about an hour. So far, I didn't find any dropped leaves. And it has been raining too as you know, quite a bit. All my plants are fully exposed. Maybe it could happen (what you suggested) - but I have been growing jades for years; keeping them outside until late fall when temps drop to somewhere between 5-10*C and never lost so many leaves in same way as you describe. Plants could get a frostbite - but that would look different, and temps would have to be lower. Here is photo from yesterday:

The trunk seems to be firm. I just went to check on it and 3 more leaves have fallen off.

I can't think of what the problem is. Leaves in the photo look healthy, and the way they are detached is not how they fall off for natural reasons. It would take bit of effort to pull them off so cleanly. You can't just gently knock them off. Are they soft? Is the very end where it should be attached to stem soft and perhaps slightly shrivelling? Can you take clear close-up? Or look at it with magnifying glass and describe...

I went looking, and found 3 old leaves on the same plant that are drying up. Here is a pic of leaf still attached, and after it fell off (it is papery dry and crisp). Plant is quite large, and there were only 3:

This is the best photo I could get. The leaves are not soft. And yes they have been falling off right at the spot they attach to the trunk.

Madison

It bugs me not be able to figure this out - I find it quite unusual. Wish someone else had some suggestions.

Do you fertilize it? How often do you water it? I would try to find sunnier spot so it grows more compact. Internodes look quite long. Is this only jade you have?

Have you checked the roots? Asking because the mix looks really fine and may not be draining well. There may be problems going on below the surface that aren't really visible yet but are causing the leaf drop.

Liz pointed out something I didn't ask about - I see quite a bit of perlite (?) and assumed that mix drains well. And that it is well mixed. But assuming isn't good, so Thanks to Liz for asking...

it is potted in a mix of 60% perlite and 40% cati/succulent mix, however after I repotted it I read on here the small particles of perlite should have been filtered out. May this be the problem?

Is it possible for succulents/cacti to be grown indoors and be healthy or will lack of sun harm them? This plant did not make it, but I have a few other plants I keep on my windowsill. Would it be better I moved them outside for thir growing season?

Also I think it would be best to repot my other plants in more grittier soil as much of the perlite in the soil is very fine. Where would I find grit or turface?

I get grit in 25kg bags from farm supply store, approx.$10(?). Using very little turface now, but got few bags few years ago from GardenProd; they moved since to Ancaster and best to call them if they still sell to public. Used to be just under $20 for 25kg bag then. Perlite needs to be sifted or rinsed of dust and smallest particles. Where in Ont are you?

Lack of sun could be a problem - etiolation. But many ppl have to grow indoors. Using sunniest locations for plants, and often some supplemental lighting. But if you have outdoors most will benefit from being there. Do not forget: acclimatize!!!

Are you saying plant in photo died?

I am near London Ontario.

I do have a yard but am hesitant to put my plants outside as my dog is very mischievous and would most likely cause some harm too them.

Yes the plant in the photo dropped all of its leaves.

Did you take a photo of the roots and soil when it died? Better to figure out what went wrong for next time.

My guess is very limited root system wasn't established in the mix resulting in shriveled leaves and then over watering resulting in the dropped leaves.