In short
- Mulch keeps soil cooler, holds moisture, cuts down on weeds and feeds the soil, but it needs topping up every year or two.
- Rock lasts for years, but it holds heat and doesn't improve the soil.
- SAWS recommends 2 to 3 inches of natural, un-dyed mulch, kept several inches away from trunks and stems.
What mulch is
The brown layer of shredded bark or wood that covers the soil around your plants.
Mulch vs. rock
| Mulch | Decorative rock | |
|---|---|---|
| Heat | Keeps soil cooler | Holds heat and warms the ground, which can stress plants in summer |
| Water | Holds moisture | — |
| Soil | Feeds the soil as it breaks down | Doesn't improve the soil |
| Weeds | Cuts down on weeds | Weeds can still come up between the stones |
| How long it lasts | Needs topping up every year or two | Lasts for years once it's in place |
How deep, and how often
- Depth: SAWS recommends 2 to 3 inches for most landscape beds. Use natural, un-dyed mulch such as hardwood or pine bark, and keep it several inches away from tree trunks and plant stems.
- How often: organic mulch breaks down over time. Clemson Cooperative Extension suggests replacing it every year or every other year.
Two plants that handle the heat
A low-maintenance bed isn't just rocks. Plants chosen for Texas heat keep it green and blooming with less water.
- Lantana: a Texas Superstar plant, heat and drought tolerant, best in full sun and soil that drains well.
- Gold Star esperanza: a Texas Superstar shrub with yellow blooms; handles heat and drought once established, with full sun and good drainage.
SAWS coupons and your HOA
SAWS has offered WaterSaver coupons for turning grass into planted beds. Check the current program on saws.org.
Many HOAs ask for approval before you change beds or materials in the front yard. Check your HOA's rules before the work starts.
We install both
Not sure which fits your yard? Pick "Not sure, recommend something" in the estimate form and we'll talk it through. See beds, mulch & rock.
Sources
- San Antonio Water System (SAWS), “Mulch matters: the right way to mulch” (May 2026)
- Clemson Cooperative Extension, “Mulch or Rock: Which Do You Prefer?” (Jan 2025)
- AgriLife Today, “Lantana camara varieties named newest Texas Superstars” (May 2024)
- Texas A&M AgriLife Extension, Travis County, “Texas Superstar: Gold Star Esperanza” (Jun 2023)
- San Antonio Water System (SAWS), “Take the path to less grass with WaterSaver coupons”
Checked Oct 18, 2026. Water rules and dates can change: always confirm with the source.