As of mid-September 2026, here in Riverside, the foundation beds around my old ranch house are due for fresh mulch before the first rain, and my reflex is the one I’ve had for years: haul in a few bags of bark and bank it right up against the stucco, thick enough that it looks finished and holds water for whatever is planted along the wall. No bare dirt, a clean edge, moisture locked in where everything else dries out fast.
Then I read the Riverside Fire Department’s page on the zones around a home. Zone 0 is the first five feet out from the house, and the department’s instruction for it is blunt: “Avoid anything combustible in this zone: woody plants, mulch, woodpiles, combustible trellises, and stored items.” It calls that strip an excellent place for pavers, rock mulch or pea gravel instead. My bark bed sits exactly where the fire department wants rock.
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What the University of California says
The University of California’s master gardeners give the same distance for a different reason, and they spell it out for anyone mulching around a house: “Keep organic mulch, except compost, five feet or more away from the home and all structural foundations; consider a band of inorganic mulch against the foundation to deter termites and other pests.” For the strip closest to the house they name the same materials the fire department does: non-combustible rock, gravel, concrete and pavers for areas less than five feet from structures.
Why the moisture works against you
Holding water against the wall is the whole point of that bark, and it’s the problem. California’s Department of Pesticide Regulation explains what the insects in the soil need: “Subterranean termites nest in soil and forage away from their nests. They depend on moist environments and build mud tubes to prevent themselves from drying out when foraging above-ground.” The same agency says termites are attracted to moisture and to soil-to-wood contact, and it tells homeowners to keep mulch at least a foot away from structures as a minimum…