The color morphing of hydrangea flowers can be a surprise for those with bigleaf hydrangeas, H. macrophylla, or H. serrata (mountain hydrangea). To ensure stronger growth and blooms, it is essential to know the variety of hydrangea you have. For bigleaf hydrangeas, commercial fertilizers can change the color from pink to blue. For overwintered hydrangeas, fertilize them in early spring and again.
The best fertilizer for hydrangeas is a granular, not liquid, fertilizer formulated for woody plants. Organic, slow-release fertilizers like Espoma Rose Tone are an excellent choice, as they are flowering shrubs like hydrangeas. Hydrangeas thrive when fed a balanced or all-purpose fertilizer like 10-10-10 NPK or 12-4-8 NPK.
Rose food and any granulated shrub fertilizer, either organic or a time-release product, are ideal. To lower pH, apply an acidic fertilizer such as aluminum sulfate or wettable sulphur. Mulch with peat or pine bark and use exact amounts of lime or aluminum sulfate.
Hydrants benefit from a 10-10-10 NPK fertilizer, while higher phosphorus fertilizers can boost blooms. HollyTone NPK is 4-3-4 for all hydrangeas, and RoseTone is similar for oakleaf, panicles, smooth, and macrophylla. A good all-purpose composition will provide all the fertilizing hydrangeas need, either from a chemical source or organic matter.
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