Living · 6 pages · 12 min
How mulch saves water and hides weeds
A surface cover slows evaporation and blocks the light many weed seeds need.
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From the opening
Mulch saves water by shading the soil and calming the wind at the surface, so less water evaporates from the top layer. It suppresses many weeds by blocking light that their seeds use as a germination cue and that small seedlings need in order to grow, so one layer is doing two physical jobs. The opening covers shade and wind off the soil surface, light blocked from weed seeds, and why a thin sprinkle fails.
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Inside
- Shade and wind off the soil surface
- Light blocked from weed seeds
- Why a thin sprinkle fails
- Surface chips versus wood mixed in
- Where the idea stops applying
- A distinction worth keeping
Sources
- Mulch reducing soil-surface evaporation
- Light exclusion and weed-seed germination