Sometimes you think you're paying really close attention but then you suddenly notice something has happened over the past few years.

I focused on how this tree has some naked spots on the trunk, which I'd noticed in passing but then I realized it has been losing the leaves grown while inside for winter, and retaining the ones grown while outside for summer. Dracaena 'Ricky / Rikki'



And Rick has a friend.


Do you have some plants with winter parts vs. summer parts? Or different sections from moving house, or moving something to a different location inside or outside location?

Hm, yes, you can see the different leaf spacing.

I don't think I have a good one to show. My big Dracaena braunii have been indoors for a couple years now, WillC persuaded me to leave them well enough alone (chuckle) --It seemed they got such nice sturdy root shoots when outside for summer, but now I think all their root shoots are sturdy.. I'll have to take a look and see if I still think that.

Mostly its etiolated succulents, or the lemon that used to grow beautifully over summer, but get covered in scale and drop everything in winter (chuckle/not chuckle)

Here's another plant where it's as obvious, a cactus. The fat parts are summer, the skinny parts are winter.

I haven't noticed such things in terrestrial plants yet, but (semi)aquatic plants do the same, but as a response to other conditions.

Many of the plants destined for the aquarium trade (are thus usually end up submerged) are in fact mostly grown emersed; just their roots and lower parts of the stem in the soil and water.
When they eventually end up in someone's aquarium, they tend to 'melt'. Almost all the leaves get holes and fall apart kinda like the flaky fish food; the plant seems dead.
After a while however new leaves sprout which do look fine.

Reason is that emersed grown leaves are not adapted to the submersed conditions and thus the plant aborts them in favor of ones that are adapted.

I wouldn't be surprised if terrestrial plants like your Dracaena underwent something similar, but in this case perhaps in regards to available light and temperature? But it seems odd to just abort the leaves altogether though...I'm not sure about this.

Me either, just observing & documenting.