July Gardening Tips
July Gardening Tips
for the Willamette Valley
by Rod Smith
Oregon Certified Nursery Professional
© 2002 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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