Proper Mulch for Strawberries | Home Guides | SF Gate:
Pine needles, also called pine straw, are a proper mulch for strawberries and slightly increase the acidity of the soil as they decompose. They are an ideal alternative to plastic mulch for strawberry patches with slug problems. Plastic mulch creates a moist environment slugs love, while sharp and prickly pine needles repel these creatures. Mulch with about 2 to 3 inches of pine needles a few weeks after planting or right after the plants blossom. Add pine needles to create a depth of 3 to 4 inches to insulate overwintering plants from the cold.
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