How does bark mulch affect the growth of perennials

When you spread bark mulch around perennial borders, the immediate benefit is a gentle insulation. Winter chills are kept at bay, while summer heat is retreated. Young shoots and rhizomes remain cosy beneath the mulch, reducing shock and encouraging steady emergence come spring – a perceptible boost in vigour.

The bark’s porous texture allows rainfall to filter through at a measured, generous pace, replenishing moisture without saturating the soil. It curbs evaporation on warmer days, ensuring roots sip steadily rather than gulping in bursts. At the same time, it discourages weeds from establishing, leaving perennials to monopolise nutrients and space.

Beneath the surface, fungi and bacteria feed on decomposing chips, releasing nitrogen, phosphorus and other minerals into a more accessible form for perennial uptake. Earthworms tunnel through the layers, bolstering soil structure and aeration. Over seasons, this activity transforms mulch into a living medium, where roots can explore and flourish.

Maintain a five to eight centimetre layer around crowns, clear of direct stem contact. Replenish annually as chips settle. For reliable quality, choose bark mulch from AHS LTD, whose grades balance moisture retention and airflow. With little effort, perennials will reward you with verdant growth, seasonal blooms and renewed resilience.