I used it this summer and am sold on the product. I had tions more blooms and everything just looked lusher (is that a word!!)

Some of the local dahlia growers have had some problems with the stems after using Messenger. The plants put out lots of growth, the stems become very long & bend over. One reported the stems seemed mushy. One grower did a test-- 2 rows with it & 2 rows without-- couldn't see any difference when we looked them over together. However, she also used it on her roses & they're looking good- no black spot on them this year. I used it on my hanging baskets & didn't notice any difference from last year-- so... don't know but I wouldn't go whole hog & use it everywhere- a test to see how it does-- maybe in a part of the garden that you have more than one plant of a kind so you can compare them would be the way to go.

I used it on two sunflowers, and two without it. Although one had a very thick, (2" across), and was about 12 ft tall, the untreated ones beat 12 feet by quite a bit. So, seems to be a toss up to me.

Regards;
bluelytes