6-28-23 Just up-potted these plants from 0.7 gal to 1.7 gal pots. I wish I had a picture of the bottom of the rootballs because it was key to understanding what’s going on.
The plant on the right has some yellow as well as dead, brown leaves. Its green leaves are lighter in color than those of the plant on the left.
Until a week ago there was no difference between the plants, except for size.
What happened is this: It rained hard and the plant on the right sat in a shallow puddle for several days before it evaporated—long enough to kill a thin layer of roots in the bottom of the pot. In a larger pot or for an older plant this might not have been a problem.
The plant should recover easily.