Well, first of all that that’s not a hydrangea, that’s a rose of Sharon, a type of hibiscus.
Second of all those are aphids and they are really common on hibiscus family plants for whatever reason.
Third of all, the best way to get rid of them is by sprinkling diatomaceous earth. I’d do it now while the plant isn’t blooming because the diatomaceous earth kills all insects, so you don’t want pollinators to be caught in the crossfire.
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Well, first of all that that’s not a hydrangea, that’s a rose of Sharon, a type of hibiscus.
Second of all those are aphids and they are really common on hibiscus family plants for whatever reason.
Third of all, the best way to get rid of them is by sprinkling diatomaceous earth. I’d do it now while the plant isn’t blooming because the diatomaceous earth kills all insects, so you don’t want pollinators to be caught in the crossfire.