Mulch Calculator
The right depth of mulch suppresses weeds, retains moisture, and improves soil health. Calculate exactly how much you need and avoid costly over-ordering.
Mulching Your Garden
Recommended Depths
Annual weed suppression: 50–75mm. Perennial borders: 75–100mm. Tree circles: 75mm, keeping mulch away from the trunk. Too thin and weeds push through; too thick and plant crowns can rot.
When to Mulch
Apply mulch in spring after soil has warmed, or in autumn to protect roots over winter. Always mulch onto moist soil — mulching dry soil locks moisture out rather than in. Remove weeds first.
Types of Mulch
Bark chippings: long-lasting, slow to decompose, best for shrub borders. Wood chip: cheaper, decomposes faster and adds organic matter. Compost: best for vegetable beds, feeds plants. Decorative stone: permanent, no weeds, but adds no nutrients.
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