The seem to be growing much slower this year. It’s now well into July, and they are just now starting to bloom steadily. I got them in the ground a bit later than usual, but I don’t that that explains it all.
The picture below show the current height, which I’m pretty sure is way shorter than previous years. For the first time, the potted plants seem to be doing better than the ones in the yard. That makes me think the soil is the issue. I’ll compost for next year.