When should you mulch in the garden? Garden experts explain the best timing and reasons why
There are so many benefits to mulching your garden, but when should you do it for maximum effect?
Whether you're a seasoned gardener or new to the hobby, you've probably come across mulch and heard of all the benefits it offers. However, there is an art to the timing of mulching, and getting it right delivers more results.
Mulching is a fantastic way of protecting your plants from all different types of weather, and it can also be a great way of transforming your garden on a budget. Because of its versatility, it can be difficult to know exactly when it is best to add it to your garden and time it right so your plants are actually reaping the benefits.
So whether you're looking to prepare your garden for an upcoming heatwave or need to protect your plants from frost, here's when the experts recommend adding mulch to your plot.
When should you mulch in the garden? Expert advice
In the same way that there's a best time to water your garden, you'll get the most benefits from mulching your plants when it's done at the right time of year.
"Mulching's most effective when the soil's already moist and warm enough for plants to grow well," explains Dr Russell Sharp, Founder of Eutrema. "The main purpose of mulch is to conserve moisture, suppress weeds and gradually improve the soil as organic materials break down, so applying mulch after watering or after a period of rain helps trap that moisture in the ground and reduce the need for frequent watering during warm weather."
"Mulch also protects the soil from extreme temperature changes, which is particularly useful during hot, dry spells. Around trees, shrubs, roses and perennial borders, a layer of organic mulch can make a noticeable difference to plant health over the course of the growing season," he adds.
Mulching is also an important step to take if your area is under a hosepipe ban, as the organic layer will retain soil moisture, meaning less watering is needed.
Dr Russell is an innovator, best known for developing the range of plant care products offered by his company, Eutrema.
When should you not use mulch?
As with many garden tasks, take deadheading your plants, for example; there are times when it's not suitable and could be more of a waste of your time than anything else.
"You should not mulch just before extreme weather is expected. Very wet or windy conditions can wash or blow away the fresh mulch, as it is usually a lightweight material," says Richard Barker, horticulture expert and Commercial Director at LBS Horticulture.
"You should also avoid mulching too early in spring, usually before the soil has had time to warm up. This is because the mulch will act as an insulator, and placing it too early can trap cold moisture in the soil and prevent it from warming," he explains.
So we certainly wouldn't recommend adding mulch to your March garden jobs next year, but as always, work with the ever-changing weather.
With 4 years in the industry, Richard is a gardening expert at LBS Horticulture. He is keen to share his knowledge with both experienced and beginner gardeners, and prides himself on keeping up to date with the latest horticultural trends.
What month is best to mulch in the UK?
Whilst mulching can be beneficial for various reasons throughout the year, in different seasons, there is a key time when it's best to start mulching your garden.
"April is usually the best month to mulch," says Dr Russell. "By then, the soil has usually started to warm up after winter, but it still holds plenty of natural moisture. Applying mulch at this point helps lock that moisture into the soil before the hotter weather arrives and weeds become more established."
So while you're sowing your flower seeds in April, you can also mulch your plot as you go.
"Autumn can also be a good time to mulch, particularly around trees, shrubs and perennial plants, as it helps protect the soil over winter while organic materials gradually break down. Rather than focusing on an exact date, it's better to look at the condition of the soil. If it's moist, workable, and the risk of prolonged frost has passed, it's usually a suitable time to mulch," he continues.
What is the downside of mulch?
You can, of course, make a spring gardening mistake when mulching and the mulch itself does come with some downsides. Luckily, knowing them beforehand means you can prepare for and prevent as much as possible.
- Root rot: "A layer of mulch that is too thick will trap moisture in the soil, potentially suffocating plant roots, causing root rot and promoting fungal growth," says Richard.
- Pests: Unfortunately, mulch layers can become the ideal dark, damp hiding spot for garden pests like slugs and snails, so you'll need to put in some more anti-pest measures after mulching.
- Nitrogen depletion: Richard says, "If you use uncomposted mulch, such as sawdust or uncomposted wood chips, it can take nitrogen from the soil as it breaks down."
- Risk of stem rot: The way you mulch is important too, Richard explains, "If mulch is placed too close to the stem of a plant, this traps moisture against the stem and makes it vulnerable to diseases."
So whether you want to keep your garden healthy while you're on holiday or need to change how you water your garden during a hosepipe ban, now you know when and when not to mulch.
