Karen , Zinna seeds are most often very adaptable , the blooms usual match descriptions , but in a free ( open garden or field) setting even tiny ones grow large , Most often the types described as shorter work in pots ,
as you said though , I'm sure that is partial lesson you have learned I have the tall 4 ft zinnia red , there is one stuck in a pot that grew a single bloom barely under 2 ft tall same seeds , same plant , all in the growing difference
I do a bunch of weed , one of my favorite and hated is Bull Thistle , But I got painted lady butterflies from one this year
