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July Gardening Tips

July Gardening Tips
for the Willamette Valley

by Rod Smith
Oregon Certified Nursery Professional

© 2002-2009 Rodney A. Smith
All rights reserved.
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Pruning

Cut off old flowers to encourage repeat blooming. Cut delphiniums and columbines back by half for a fall bloom.

Pruning overgrown deciduous trees and shrubs in the summer will slow down their growth the following year.

Prune hedges now, especially if you trim only once per year. Make the bottom slightly wider than the top to keep it from becoming bare at the bottom.

Rapidly growing branches on Apples, Pears and Blueberries can be cut back to 3 or 4 leaves so they will form productive lateral branches.

Remove blackberry and raspberry canes that have fruited to make room for the new canes.

Spraying

Continue to spray for leaf spot diseases and powdery mildew if plants are watered by overhead sprinklers.

Spray rhododendrons twice a month through August for root weevils if the leaves have notches on the edges.

Spider mites are a serious problem on arborvitae and needle leaf evergreens during hot weather. Spraying once a month makes them worse. Apply two miticide sprays a week apart. Hosing down the plants once a week with plain water also helps.
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