plant maturity & disease resistance
Do you find that older plants have less disease or are more tolerant of disease? It seems that way to me & others have commented on it (Modern HTs on OGR forum). Or is that just an artifact--some individuals survive because they are more resistant to begin with?
It's true in cattle (okay, a long stretch comparison). Mature cows are much more tolerant to or resistant to worm infestation. Calves & yearlings need regular treatment.
It seems like if I can get a rose plant to the 3 year old stage it lasts forever with minimal disease after that.