Amanda Lees

What I think you have is Crassula perforata - your last photo shows variegated form. I can't tell if it is all the same plant - was it started from cuttings of the same plant? I don't think it is grown in enough light since some photos show very etiolated plant. In low light, variegation may not show. Occasionally, variegated plant may revert & grow just green leaves. While it could "fry" in hot, direct sun (usually around noon time), it still needs good light to stay compact.

Dry & crispy leaves happen if plant doesn't get enough water. But it is confusing because you say some leaves are squishy - that would suggest overwatering. It is possible that some of your soil drains better than other, and if you water at the same time that would cause some to be over- and some be under-watered.

As plant gets old, stems tend to get woody. It is good idea to cut it down and restart cuttings. I trim cuttings if they are very woody/hard. They root very easy; I have quite a few pots from 1 original small pot. I leave original stem (with roots) quite short & in the pot; it most often branches out again.

What is the "white oil" you sprayed it with?

If there is a fungus, it is best to use a fungicide (like sulfur). If you see some webs, plant could have mealy bugs & should be treated asap

I noticed couple of your plants look different - this looks to be Crassula pyramidalis. Also one of the 'stacked crassulas' but different sp.

And this may be Crassula rupestris or one of the hybrids. They all have same needs

Yes thats Crassula pyramidalis (Spring La fountain)

the the others are

Baby’s necklace

Crassula perforta giant form

Crassula perforta southern cross variegation

Crassula perforta veriegate ( more yellow and green) its jot a cuttingtying.

Crassula rupestris 'High Voltage'

The babys necklace used to be plump and well together but after it got sick and lost leaves it went like that.

now the same plant has both crispy leaves and wet soggy leaves. (confusing i know).

White oil is sold commercially as a petroleum oil-based organic pesticide

It is effective in the control of aphids, scale, mealybug, mites, citrus leaf miner, and smooth skinned caterpillars."White oil" is also an alternative name for mineral oil. I use this on my orchids all the time and saw no mention of side effects on Succulents.

Amanda Lees

TY for the explanation - different countries label their products differently...I have bought some horticultural oil years ago; but if any bugs - I use rubbing alcohol & have been for years now. I never used mineral oil (what is called mineral oil here!) on plants & not sure how/if it works.

Side effects sometimes demonstrate if sprayed plant is left in the sun while still wet - if I need to spray, I move plant out of sunlight/strong light. BUT I think you know that.

I see you have quite a variety of stacked crassulas. Care of them should be the same - good drainage; good light; water when needed...regular pruning for the desired form...IF THOSE PICTURED were my plants I would most likely restarted some cuttings & make sure they are in well draining mix (I add lots of sifted perlite & grit to the mix)