If you've ever spent a Saturday on your knees pulling the same weeds you pulled a fortnight ago, wool mulch is worth a look. It's a simple job that keeps working long after you've put the trowel away.
How it helps keep weeds under control
Many weed seeds need light to germinate. A layer of wool mulch around 3cm thick blocks much of that light, helping to reduce weed germination before it starts.
Water and air can still move through to the soil beneath, helping to create a healthy growing environment for your plants.
While no mulch can stop every weed, wool mulch significantly reduces weed growth, and any weeds that do appear are often fewer in number and easier to remove.
It feeds your plants over time
Wool is a natural protein called keratin. As it gradually breaks down, it contributes nitrogen and other nutrients to the soil over time.
Rather than a quick burst of nutrients, wool provides a slow-release source of organic matter that helps support long-term soil health.
Your soil life will thank you
Worms thrive in moist, protected soils rich in organic matter, and wool mulch helps create those favourable conditions.
Wool is excellent at holding moisture, helping the soil stay damp for longer during dry periods. It also acts as a natural insulator, helping moderate soil temperatures through both summer heat and winter cold.
As the wool breaks down, it supports soil microorganisms and contributes organic matter to the soil. Healthy worm populations and active soil biology can help improve soil structure, aeration and nutrient cycling, creating a more productive garden over time.
If you'd like to go a step further, wool mulch can also be worked into the soil, where it may help improve moisture retention and add organic matter as it decomposes.
A few extra benefits
Less watering
Wool holds moisture near the root zone, helping soil stay moist for longer and reducing the need for frequent watering.
Fewer chemicals
By suppressing weeds naturally, wool mulch can reduce the need for herbicides, sprays and synthetic weed barriers.
A sustainable local resource
New Zealand wool is a renewable by-product of farming. Using it in the garden helps put a natural, locally sourced material to good use.
How to use it
1.Remove any large or established weeds.
2.Water the soil if it's dry.
3.Spread the wool mulch around 3cm thick, keeping it a few centimetres away from plant stems and trunks.
4.Top up as required as the wool gradually breaks down.
How much do you need?
As a general guide, 1kg of wool mulch covers approximately 1 square metre when applied at the recommended depth.
Wool mulch is ideal for:
•Vegetable gardens
•Fruit trees (except lemon trees)
•Berry patches
•Raised beds
•Flower borders
•Native plantings
Do the job once, do it well, and let the wool do the hard work. Less weeding, healthier soil, and more time to enjoy your garden.
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