When should I refresh mulch in garden beds?

In New Brunswick, refresh mulch in garden beds every 1-2 years, with the best timing being late spring (mid to late May) after the soil has warmed but before summer heat arrives.

The timing depends on your mulch type and garden conditions. Organic mulches like shredded bark, wood chips, or compost break down faster in our Maritime climate due to high humidity and moisture, typically needing refreshing annually. Stone mulches or rubber mulch can last 2-3 years but may need topping up where they've shifted or settled.

Late May is ideal timing for New Brunswick because the soil has warmed enough for beneficial microbial activity, but you're getting ahead of summer weed pressure. This timing also allows any perennials that are slow to emerge (like hostas or astilbe) to push through before you add fresh mulch. Avoid mulching too early in spring when soil is still cold and wet, as this can delay soil warming and potentially promote fungal issues in our humid climate.

Signs your mulch needs refreshing include visible soil showing through, the mulch layer being less than 2 inches thick, or organic mulch looking gray and decomposed rather than rich and dark. In areas with heavy foot traffic or where you've been working in the beds, mulch often gets scattered and needs replenishing more frequently.

When refreshing, don't just pile new mulch on top of old. Pull back existing mulch, weed thoroughly, and add a thin layer of compost if your soil needs organic matter. Then apply fresh mulch to a total depth of 2-3 inches, keeping it 2-3 inches away from plant stems and tree trunks to prevent moisture-related diseases and pest issues.

For DIY homeowners, mulching is straightforward work you can handle yourself. Calculate about 3 cubic yards of mulch per 1,000 square feet for a 2-inch layer. Many NB garden centers offer delivery, which saves your back and vehicle. However, if you have large beds or want a complete garden refresh with new plant additions, a landscaper can efficiently handle the entire project and ensure proper plant spacing and mulch application.

The investment in quality mulch pays dividends through the growing season by retaining soil moisture during dry spells, suppressing weeds, and gradually improving your soil as organic mulches decompose.

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