Why your sandy garden might be repelling water like a raincoat
In short: Sandy soil is often dismissed as 'poor,' but it has unique properties that can be mastered. This video explains why some sand becomes hydrophobic and provides a blueprint for transforming it into a nutrient-rich sanctuary.
Sandy soils, particularly in coastal areas like Perth, can become 'non-wetting' or hydrophobic. This happens when decomposing organic matter coats sand particles in a waxy substance, causing water to bead off rather than soak in. To fix this immediately, organic wetting agents like humic acid can break down that wax, though long-term success requires structural changes.
The key to success lies in two elements: organic matter and clay. Adding aged manure or compost improves moisture retention and microbial life, while specific clays like bentonite or kaolin can permanently alter soil texture. For intensive areas like vegetable patches, deep enrichment is necessary, while larger areas benefit from consistent annual mulching and organic top-dressings to prevent degradation.
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Sources
- Summary by Intellect · source: How to garden on sandy soil
- Also: www.rhs.org.uk — Sandy soils: plants for | RHS Advice
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