Weeping willows (Salix spp.) produce extensive root systems that spread far beyond their canopies. The aggressive root systems of these trees can damage pavements and buried structures around them. Installing protective root barriers around vulnerable buried structures and selecting the right planting spot for your weeping willow helps ensure the long-term health of your tree and protects your property from damage.
The roots of weeping willow trees create a network of shallow roots that spread out from the tree in every direction. Weeping willow roots can spread out from the trunk up to three times the distance between the edge of the tree's foliage and its trunk. Weeping willows typically produce foliage that is between 45 and 70 feet wide at maturity with roots that can spread approximately 100 feet from the center of the trunk of large specimens.
Weeping willows have a wide growth habit above and below the ground that needs an open space. Weeping willows grow well in full or partially shaded areas but prefer direct sunlight. The roots of weeping willow are adapted to wet soils made of clay, loam or sand with an acidic or alkaline pH but grow best in areas that are well-drained and free of competing roots from other plants. Choosing areas with proper drainage helps prevent the growth of fungi in the soil and prevents root rot.
Weeping willows have extensive root systems that grow close to the surface. Disturbing the soil around your willow can damage its roots, weakening your tree and leaving it vulnerable to further damage from insects, disease or weather. If a mowed lawn surrounds your willow, take care to avoid damaging roots that broach the surface when you mow.
Root barriers can prevent the root system of your weeping willow from damaging buried water and sewer lines, septic tanks or foundation walls. Physical root barriers made of metal or plastic buried between your weeping willow and vulnerable structures restrict the growth of large potentially damaging roots. Wire mesh root barriers allow small roots to spread beyond the barrier and allow water to drain through the barrier. Solid barriers of plastic or metal often force roots to grow around them and can prevent water in the soil from draining properly.
Root barriers are most effective when they are buried at least 3 feet deep. Using a root barrier that runs the entire length of the structure you need to protect ensures that the broad root system of the weeping willow does not simply grow around the barrier. Using an inadequate root barrier only postpones the damage this tree can cause. The roots of weeping willow trees often broach the surface of the soil and can cause considerable damage to sidewalks and other paved surfaces near the tree.
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