Why a simple layer of mulch can slash your watering needs by 70%
In short: Mulch acts as a protective blanket for your soil, keeping it cool and moist. By reducing evaporation and slowing rain run-off, this essential gardening tool can decrease your watering requirements by up to 70%. However, choosing between organic, inorganic, or living mulch requires understanding how each interacts with your specific environment.
In drying climates, mulch serves several vital functions. Beyond moisture retention, it suppresses weed germination and reduces competition for light and space. It also provides insulation for the soil and, when using organic varieties, adds essential nutrients as it decomposes. Because it slows down rain run-off, it helps ensure water penetrates the soil rather than washing away.
Gardeners generally choose from three categories. Inorganic mulches, such as gravel or crushed brick, are ideal for paths or fire-prone areas, though they provide no organic matter. Living mulches use groundcovers to shade the soil, but these can compete with other plants for nutrients. Organic mulches, including straw or bark, are highly effective at adding organic matter back into the soil through decomposition.
The choice of organic mulch often depends on the scale and the specific plant. For example, a heavy, wood-based mulch can last several years and resist being scratched away by animals like chickens. In contrast, finer woody mulches look neater but require more frequent replacement as they break down more quickly. For delicate seedlings, using chopped-up straw is preferable to prevent larger pieces from smothering the young plants.
Application technique is equally critical to avoid plant health issues. It is essential to water the soil thoroughly before applying any mulch. While light, fluffy straw can be applied thickly, heavier materials like gravel or wood mulch should be limited to a 2-3cm layer to ensure rain can still penetrate. Crucially, heavy mulches should be kept away from the bark of trees to prevent problems like collar rot.
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Sources
- Summary by Intellect · source: Mulch – which one and when to use it | DIY Garden Projects | Gardening Australia
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