Pine Straw Mulch - Pine Needles Mulch - 3000 Square Feet Pine Straw Mulch - Pine Needle Mulch - 3,000 Sq Ft Pine Mulch has a pine needle length of 9 inches. Great for flower beds, garden areas, and can be an effective method of weed control. Pine straw helps insulate the soil from temperature fluctuations and will not move with heavy rains. A wide variety of plants thrive with pine straw mulch, including azaleas, camellias, hostas, ferns, hydrangea, magnolias.