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Old 07-19-2013, 08:49 AM
Mark Oomkes Mark Oomkes is offline
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Join Date: Dec 2000
Location: Grand Rapids, MI
Posts: 9,648
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.
“Every step we take towards making the State the Caretaker of our lives,

by that much we move toward making the State our Master.”

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