Mulch vs. rock beds in Garland's clay soil
Use mulch in beds with plants you want to keep alive through August: it holds water, cools roots and slowly improves clay. Use rock along the foundation, around pools and patios, on slopes, and with dry-loving plants. Many Garland yards use both.
Every spring someone asks us to replace their mulch with rock "so I never have to deal with it again." Every fall someone else asks us to pull the rock out because the beds hit 130 degrees in July and everything died. Both are right, depending on the bed.
What mulch does
Mulch is a working layer, not just a finish. Two to three inches of shredded hardwood or cedar:
- Holds water. On clay that bakes into brick, that's the difference between watering twice a week and every day.
- Keeps roots cooler in August, which shrubs, perennials and young trees notice.
- Feeds the soil as it breaks down. It's the only long-term way to make clay easier to work.
- Suppresses weeds while it's fresh and thick.
The trade-off is that it breaks down. Most beds here need a top-up once a year, and full-sun, irrigated beds sometimes twice.
What rock does
- Doesn't decompose. Put it down once and it stays for years.
- Doesn't wash away in a storm the way fresh mulch can on a slope.
- Looks clean in modern and xeriscape designs, around pools, and along foundations.
- Drains fast on top, which matters next to a foundation.
The trade-off is heat. Rock soaks up sun all day and radiates it back into plants and the house wall at night. Over time it also collects leaves and dirt that weeds root in, and weeding rock is much harder than weeding mulch. Removing rock later is a truck-and-shovel afternoon, not a rake job.
Where we'd use each in Garland
Mulch
- Beds with shrubs, perennials or seasonal flowers.
- Around trees, in a ring pulled back from the trunk.
- Front beds you want looking fresh every spring.
- Anywhere you're trying to improve clay over time.
Rock
- Narrow strips along the foundation and under drip lines.
- Around pools, patios and walkways.
- Beds of agave, yucca, Texas sage, lantana or ornamental grasses.
- Slopes, and dry creek beds over a drain line.
Four things to get right either way
- Edge first. A clean edge is what makes either material look finished.
- Weed fabric under rock, never under mulch. Under mulch it blocks the soil benefits and turns into a mess.
- Get the depth right. Two to three inches of mulch, about two inches of rock.
- Keep it off the trunk. Anything piled against bark holds moisture and rots it.
Want the beds done, not debated?
Free bed estimates in Garland, Richardson, Murphy, Rockwall and East Dallas.