When to Mulch: the Dos and Don'ts of Mulching

When to Mulch

Mulch enhances any garden by retaining moisture, protecting tree roots, and suppressing weeds that don't get enough sunlight. It can also include treatments to repel pests, so always check the label. Beyond its practical benefits, mulch neatly outlines your flower beds. However, effectively using mulch requires timely application; knowing the right time to mulch maximizes its benefits.

Broadly speaking, the best time to mulch is in spring after a light rainfall. Mulching in spring helps flower beds look vibrant and deters weed growth. For lawns, mulching grass with a lawn mower is a good strategy.

Don't mulch too early in spring, or the mulch will slow the ground warming up.

 Wait to mulch until your spring bulbs have all come up. If you have trees that drop a lot of litter in spring (such as maples that drop buds or helicopter seeds), then you might want to wait and mulch after this happens, so that the litter doesn't fall on your fresh mulch.

Since one function of mulch is preservation of moisture, just after a light rainfall is considered a great time to apply mulch as long as ground is not completely waterlogged. Spraying the surface of the mulch lightly with water after you spread it helps it set and stay in place.

Tip:Avoid laying mulch just before major rainfall of very windy weather, as these weather conditions might cause some of your mulch to run off or blow away. The heavier the much is and the longer it's been in place, the more it will settle and not be at risk of blowing away.

Mulching in Summer

Some gardeners like to freshen up their mulch in summer, for various reasons. There might be more weed growth than expected due to heavy rain. Some mulches might fade and adding a new layer can refresh the color. Also, in times of drought, a bit of extra mulch can help retain more moisture after watering.

Mulching in Fall

Mulching in fall is often part of the garden routine as the season winds down in many growing zones. Mulch can provide protection from winter cold and dryness. For some shrubs, such as roses or hydrangeas, a lightweight natural mulch (such as pine straw) can be a better choice than heavier mulch such as wood chips, as it is less likely to freeze in case of excessive moisture.

You can also use fallen leaves for an effective winter mulch. Decaying leaves will also add nutrients to your soil and provide a place for early spring insects (including beneficial pollinators) to lay their eggs.

Mulching in Winter

Winter is a bit late for mulching in most areas. But if it looks like your shrubs could use some extra protection from harsh weather or the temperatures are about to get much colder than usual, a bit of extra mulch can help protect the root systems of shrubs. Mulching in winter can also help protect your spring bulbs from squirrels who might dig them up.

When Not to Mulch

Don't mulch just before major rainfall is expected. Too much rain might cause your mulch to run right off your flower beds or away from the base of a tree. You also shouldn't mulch right before a very windy day. Once your mulch has been established for a period of time dependent on weight and quantity, it will be less vulnerable to being shifted by weather conditions. Source