Landscaping Choices That Protect (or Damage) Your Concrete

Landscaping and concrete are neighbors. What you plant and how you water it has a real effect — good or bad — on driveways, patios, and walkways over the long run.

Trees

Mature trees planted near slabs draw moisture unevenly from the soil column, and their roots can grow beneath or beside concrete — see can tree roots cause concrete to settle or crack?.

• Plant large-canopy species (maples, elms, pines) at least 15–20 feet from slabs
• Choose smaller ornamentals near patios
• Prune roots proactively when a tree is close to a walkway

Irrigation

Over-watering is the landscaping habit that damages the most concrete in Spokane. Saturated soil loses strength — the mechanism covered in how Spokane's silty loess soil affects more than just concrete.

• Aim spray heads away from slab edges
• Use drip lines in beds within 3 feet of concrete
• Adjust run times seasonally — reduce in fall to let soil dry

Mulch Beds and Edging

Mulch traps moisture. When a mulch bed abuts a slab, water sits against the concrete edge — accelerating joint deterioration and sub-base saturation.

• Slope mulch beds away from slabs, not toward them
• Use a shallow gravel strip between mulch and slab to promote drainage
• Keep mulch depth below the slab surface at the edge

Grading and Drainage

Landscape grading directly controls where water goes. Grade should fall at least 6 inches over the first 10 feet away from any slab or foundation — a fix covered in 7 common drainage mistakes.

Lawns and Turf

Bermed or crowned lawns that direct water toward slabs are a common issue in Spokane retrofits. A modest regrade often solves years of pooling.

If a slab has already settled, concrete leveling can restore grade — but the durability of the lift depends on getting the surrounding landscape working with the concrete, not against it. Request a free on-site inspection and the technician can flag both slab and landscape issues in one visit.