Professional Mulching & Application Guide
Applying a consistent layer of mulch or bark chippings is a foundational gardening skill. For success in the shifting UK climate trends, we recommend a 75mm depth to provide maximum protection for root systems.
Avoid "Volcano Mulching": The Donut Method
One of the most common mistakes in professional landscaping is piling mulch directly against the trunks of trees or stems of shrubs—a practice known as "Volcano Mulching". This traps moisture against the bark, leading to rot, fungal disease, and rodent damage.
Expert Tip: Use the "Donut Method". Lay your mulch in a wide circle but leave a 5cm (2 inch) gap around the base of the plant. This allows the root flare to breathe while still providing all the moisture-retention benefits to the surrounding soil.
Climate Resilience & Thermal Performance
As UK summers become increasingly dry, mulch serves as a vital thermal insulator. A professional-grade 75mm layer of coarse bark can result in up to 38% fewer watering sessions by significantly cutting evaporation rates and keeping soil temperatures stable.
How to Calculate Your Requirement
- Measure: Take the length and width of your garden bed in metres.
- Choose Depth: Standard weed suppression requires 50mm; moisture retention and thermal protection require 75mm (optimum).
- Select Material: Choose Woodland Mulch (finer) or Ornamental Bark (coarser) as their densities and weights differ significantly.
- Calculate Volume: Multiply length × width × depth (as metres) to find the cubic metres (m³). Multiply by 1000 for the total litres.
Choosing Your Material
- Woodland Mulch (Finer): Best for vegetable beds and young borders. Because it is finer, it breaks down faster (within 12-18 months), adding nutrients and organic matter to the soil. It is slightly denser at approx 400kg per m³.
- Ornamental Bark (Coarser): The "gold standard" for aesthetic longevity. The larger chips take 2-3 years to break down and offer superior weed suppression. It is lighter at approx 350kg per m³.