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When is the best time to apply Horticultural Oil?

Horticultural oil is an ideal remedy to deter overwintering pests. The best time to apply it to woody plants and shrubs is before the buds break and leaves open but you also want the little pests to be active, not hiding, so wait until temperatures warm up to above zero for at least 24 hours.


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London Middlesex Master Gardeners are a non-profit group of volunteers operating locally since 1985. Our mandate is to provide unbiased gardening advice and expertise to encourage successful and sustainable horticultural practices for home gardeners.