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Northwest Regional Reports

Northwest: August Garden To-Do List

Roses like this ‘Cornelia’ hybrid musk rose (Rosa ‘Cornelia’, Zones 5–9) should be fertilized for continued summer blooms. Photo: Michelle Gervais.

Feed. Fertilize roses (Rosa spp. and cvs., Zones 3–9), lilies (Lilium spp. and cvs., Zones 3–10), and dahlias (Dahlia spp. and cvs., Zones 8–11) to encourage continuous growth and blooms.

Water some more. Ensure that newly planted trees, shrubs, perennials, and annuals are getting adequate water.

‘Muntstead’ lavender (Lavandula angustifolia ‘Munstead’, Zones 5-8). Photo: Michelle Gervais

Deadhead lavender (Lavandula and cvs., Zones 4–9). Remove spent lavender flowers to tidy up shrubs.

Pull tattered foliage. Remove spent and dormant late spring foliage from perennials.

Prune Japanese maples (Acer palmatum var. dissectum, Zones 5–9). Late summer is a good time to lightly prune summer-dormant Japanese maples.

Japanese maples can be pruned in late summer. Photo: Michelle Gervais.

Jason Jorgensen is a landscape designer in Seattle, Washington.

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