My pansy beds are struggling this year. They seem to be fairly healthy but are very weak in the blooms. I have many nice green plants; but that's all. One thing I did this year was apply Preen to the beds plus fertilizer. Although the label lists a ton of flowers that Preen is safe for, it doesn't list pansies. I just figured they'd be OK with all the other flowers listed. Any ideas as what might be my issues? I'm doing another bed of pansies tomorrow and leaving the Preen out. I hope they do much better.