[Tilted Irish Kilt]

Eric in the Ozarks :" All plants are still inside our beach house/sun room..."

If other plants are present in the sun room , all the more likely that aphids may have overwintered elsewhere.
Check the bottom of the leaves with a magnifying glass for possible beginning of aphids, or white fly .

[Eric in the Ozarks]

All the garden plants were started from seed in January.

We do have some house plants that over winter in the beach house.
Maybe they’re the source.

Thanks everyone for good ideas...