Why clay is not the enemy

The red clay across the NC Piedmont Triad has a reputation among homeowners as the killer of plants — but most of the time, the soil is not the problem. Wrong plant choice is. Clay actually holds water and nutrients longer than sandy soil, which is a benefit for the right species. The trick is picking plants that have evolved for, or can adapt to, our specific Piedmont conditions.

Here is what I plant on Reidsville, Greensboro, and Eden properties when the soil is heavy clay. All of these have been pulled from NC State Extension Plant Toolbox with our 20+ years of on-the-ground performance data in this region.

Trees that love NC clay

Eastern Redbud (Cercis canadensis)

Native, blooms purple-pink in March before the leaves come in. Tolerates clay and partial shade. Grows 20-30 ft. Hardy in zones 4-9.

Dogwood (Cornus florida)

NC state flower. Native, understory tree, white or pink flowers in spring. Needs morning sun, afternoon shade in our hotter summers. Tolerates clay if not waterlogged.

American Holly (Ilex opaca)

Evergreen, native, can grow to 50 ft if happy. Tolerates everything from clay to sandy soil, partial shade to full sun. Red berries on female plants attract birds.

Crepe Myrtle (Lagerstroemia)

Not native but well-naturalized. Tolerates clay, drought, and heat once established. Blooms summer through fall. Choose disease-resistant varieties (Natchez, Sioux, Tonto).

Shrubs that thrive in clay

Yaupon Holly (Ilex vomitoria)

Native, evergreen, takes clay or sand, takes flood or drought once established. Comes in upright and weeping forms. Workhorse foundation plant.

Inkberry (Ilex glabra)

Native, evergreen alternative to boxwood. Tolerates clay and wet feet, which makes it perfect for the low spots in NC yards.

Oakleaf Hydrangea (Hydrangea quercifolia)

Native, large white blooms in summer, burgundy fall color. Tolerates clay if drainage is not catastrophic. Partial shade.

Sweetshrub (Calycanthus floridus)

Native, fragrant maroon blooms in spring. Great for partial shade clay areas where most shrubs sulk.

Perennials and groundcovers

Hostas (Hosta spp.)

Shade clay specialists. Pick larger varieties (Sum and Substance, Empress Wu) for high impact.

Hellebore (Helleborus orientalis)

Evergreen, blooms January-March, deer resistant. Tolerates dry shade and clay.

Cast Iron Plant (Aspidistra elatior)

The name says it all. Evergreen, deep shade, clay tolerant, almost indestructible.

Liriope (Liriope muscari)

Workhorse groundcover. Evergreen, takes sun or shade, takes drought once established.

Carex (Carex spp.)

Native sedges including Carex pensylvanica are increasingly used as a no-mow alternative to turf in shaded clay areas.

What to plant ONLY if you have great drainage

These need amended soil or a raised bed in NC clay: lavender, rosemary, Mediterranean herbs, blueberries, azaleas (need acidic soil too), most succulents.

What to avoid in NC clay

Skip: most Mediterranean plants without raised beds, bald cypress in dry clay, most California native species, anything labeled “well-drained soil required” without amendment.

How to amend NC clay if you must

For most foundation plants, dig the hole 2-3x as wide as the root ball, mix the native clay 50/50 with compost or pine fines (not sand — sand + clay = concrete), and plant slightly high so the crown sits 1-2 inches above grade. More important than amending the planting bed wholesale, which leads to roots circling in the amended pocket instead of pushing into the surrounding clay.

If you have a specific spot in your yard you are not sure about, we offer free landscape consultations. Call (336) 552-7764 or fill out the free estimate form. We have planted thousands of trees and shrubs across the Piedmont Triad and can give you specifics for your microclimate.

Gary Ford is the owner of Garrison’s Landscaping LLC in Reidsville, NC. NC Turfgrass Council member with 25+ years of landscape design and installation experience in Guilford and Rockingham Counties.