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Old 07-19-2013, 08:49 AM
Mark Oomkes Mark Oomkes is online now
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Join Date: Dec 2000
Location: Grand Rapids, MI
Posts: 7,754
Are you sure lack of nutrients is the problem?

Roses are heavy feeders. Black-eyed susans generally don't need or want fertilization. Rhodies (by me) want something like Hollytone, NOT 20-20-20. Maybe they do by you, but I never would.

As a general rule of thumb, shrubs\perennials do not respond well to water soluble, fast release ferts. They are not turf grass. There are some exceptions such as roses.
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