'Psychic gift' told me Dynogen was the topic of this post... wierd.

I bought a can years ago, then asked about it in these forums, and was told that the growth spurts it promotes are a great stress to plants, generally speaking.
It's made with a powerful hormone which, when put on flower buds for instance, makes the flowers grow much larger than they normally would and is used by showers for awesome blossoms.
That means that if you do use it, you need to be extra sure you're feeding based on the plants increased needs, even then they may be stressed to the point (after the growth hormone wears off) that they have a harder time than they normally would protecting themselves againsed pests/diseases.

I did use it back when, saw no noticable difference.
I did use it in 2002 on 3 Roses (growing tips and/or buds) and noticed only one difference, one HT shot up one very huge and wildly thorned cane, but not a basal cane, I would have wanted that too much...
I did use it in 2003 on more Roses, hoping for another huge cane, saw no difference even though I sprayed more on than ever before.

Not giving up on it, maybe I need different test subjects... but I wouldn't buy it again, I see better results with kelp and alfalfa and the like.

I have used Dynogen on peonies for years. My peonies usuall grow to about 4 feet with multiple blossoms on each stem. I think its a fabulous product!