Foundation Shrubs Help, Not Hurt, Wet Basements: Planting for Drainage

A homeowner with a 5-year-old house, past flood, and foundation cracks plans to regrade with black dirt. Husband opposes foundation plants, fearing they draw water to the house. Wife thinks plants absorb water. Who's right?

Wife Wins: Plants Are Net Water Removers

Plants transpire—roots absorb soil water, release it as vapor through leaves. They lower soil moisture near foundations. They do not "attract" water from afar.

Proven Strategy

1. Regrade: Positive slope (5% minimum, 6 inches drop in 10 feet) away from foundation.
2. Foundation shrubs: Plant evergreen shrubs 3+ feet from wall. Good choices: dwarf yaupon, boxwood, holly, juniper, cherry laurel.
3. Ornamental grasses: In wettest spots—Calamagrostis, Panicum, Miscanthus—high transpiration.
4. Mulch: 2.5–3 inches shredded bark or chips.
5. Downspout extensions: Bury solid pipe 10+ feet out or to daylight.

Critical Spacing

• Shrub base ≥ 3 feet from foundation (prevents root intrusion into cracks, allows air circulation behind foliage).
• No vines on walls.
• No sprinkler heads hitting the house.

Plants + proper grade + gutter management = dry basement. The husband's intuition is backwards.

Expert: Brandon Swisher | BMSwisher@aol.com