Is bark mulch suitable for all plants

Bark mulch enhances garden situations by conserving moisture and suppressing weeds, creating a neat carpet around shrubs, trees and herbaceous plants. Its loose structure allows water and air to penetrate, nourishing roots while blocking light to germinating seeds.

However, bark mulch does not suit every specimen. Acid-loving blueberries, camellias and azaleas thrive under its slightly acidic influence, yet species favouring neutral to alkaline soils—lavender, wallflowers and Mediterranean herbs—may exhibit reduced vigour and pale leaves when surrounded by pine-based bark.

Placement and depth matter. A 5 cm layer generally suffices for most borders, while a 2–3 cm spread suits shallow-rooted perennials. Avoid piling chips against stems or trunks, as excess moisture can foster rot. Instead, leave a narrow mulch-free collar and refill annually to maintain effectiveness.

Mixed borders benefit from zoning: apply bark around acidophilic shrubs and switch to gravel or neutral mulch for pH-sensitive neighbours. Containers respond well when topped with a thin layer of bark, preserving moisture without altering root-zone pH drastically.

Bark mulch remains a versatile ally in gardens, but demands thoughtful matching to plant needs. By considering soil preferences and application techniques, gardeners ensure every bed and border welcomes the right combination for fully healthy plant growth.