Q.

When is the best time to fertilize with bone meal for hydrangeas?

Zone 18431 | joanb added on September 11, 2018 | Answered

I do not prune my hydrangeas unless I know the dead stmes.

A.
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MichiganDot
Answered on September 11, 2018

Unlike nitrogen, phosphorus moves slowly through the soil. It can be added anytime since the effect is not immediate. It should be worked into the top 2 inches of soil so it doesn't run off in a heavy rain and pollute waterways. Where I live, soils are naturally high in phosphorus and only farmers and those growing in containers need to add a source of phosphorus. Too much phosphorus is not good for plant growth. You may want to test the soil every few years to guide use of amendments. Compost is also a decent source of phosphorus and is in a form that plants can absorb easily.

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