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Prune spring-blooming plants.
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Continue pruning shrubs if reducing their size or promoting a fuller shape.
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Watch for aphids and treat on a regular basis.
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Deadhead roses and lightly shear or pinch back abundant growth on fall-bloomers.
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Remove flower stalks from spring bulbs, but leave the foliage in place until it completely browns.
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If spring beetles like the harlequin have damaged perennials, simply trim back the foliage to encourage new growth.
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Continue planting summer crops.
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Apply a preventive for powdery mildew and blackspot and/or keep an eye out to be ready to arrest it at first signs of trouble.
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Continue seeding summer annuals.