How to Mulch a Vegetable Garden Before Planting
How to Mulch a Vegetable Garden Before Planting
After creating our raised beds at Raikana Primary School, we thought we were getting close to planting. But there was another important step we needed to take first: mulching the beds.
Mulching was not something we did simply because it looked good. We had already started noticing problems around the newly prepared beds. Birds were coming into the garden and digging through the soil looking for insects and worms. Local dogs and cats were also coming through the area, and sometimes we would arrive in the morning and find animal droppings in or around the garden.
On some occasions, dogs were also digging around the beds, and parts of the raised beds could be disturbed or fall down.
At the same time, we were working under the hot autumn sun. The soil was exposed, and we did not want the moisture in the soil to disappear quickly through evaporation.
This is where mulch became an important part of our garden preparation.
In This Article
- Why we decided to mulch our raised beds
- What mulch does for garden soil
- The grass clippings we used as mulch
- Where we found the grass clippings
- Carrying the mulch approximately 1 kilometre to the garden
- How we spread the grass clippings over the raised beds
- How mulch can help protect soil moisture
- Mulch and weed suppression
- Mulch as protection from animals disturbing the beds
- Grass-clipping mulch vs straw mulch
- Important safety considerations when using grass clippings
- How thick should grass-clipping mulch be?
- Gardening Lesson
- What Came Next?
Previous article: How to Make Raised Beds for a Vegetable Garden
Why We Decided to Mulch Our Raised Beds
Once the raised beds were created, the soil was exposed and vulnerable to the conditions around the garden.
We started noticing that birds would come into the garden and dig through the beds while looking for insects and worms. This could disturb the soil we had just prepared.
We also had another challenge: local dogs and cats sometimes came through the garden.
When we arrived in the morning, we sometimes found animal droppings in the garden. Dogs were also digging in some areas, and this could disturb the shape of the raised beds.
These problems made us realise that the soil needed some form of surface protection.
There was also the weather to consider. The garden was being prepared during autumn, but the sun was still hot. Exposed soil can lose moisture through evaporation, so we wanted to cover the surface rather than leave all of the newly prepared soil exposed.
Gardening Lesson
Mulch is not just decoration. It can become part of the way you manage soil moisture, weeds, soil temperature and the surface of a garden bed. In our case, mulch also became a practical way of protecting newly prepared beds from some of the disturbance we were experiencing.
What Is Mulch?
Mulch is a layer of material placed on top of the soil rather than mixed deeply into it.
Organic mulches include materials such as grass clippings, straw, leaves, compost and other plant materials. As organic mulches break down, they can contribute organic matter to the soil.
Mulch can help reduce evaporation from the soil surface, suppress weeds, moderate soil temperature and protect soil from the direct impact of rain. These benefits can be particularly useful in vegetable gardens and raised beds.
Why Mulching Was Important in Our Garden
Our raised beds had already been prepared, but we did not want to leave the soil completely exposed.
The hot autumn sun could increase evaporation from the soil surface. Covering the soil with an organic mulch gave us another layer between the exposed soil and the surrounding conditions.
Mulch does not replace watering. If the soil is dry, it still needs appropriate watering. Instead, mulch helps reduce the amount of water that is lost from the soil surface through evaporation.
This was particularly important for us because we wanted to protect the work we had already done while preparing the beds.
The Mulch We Used: Grass Clippings
The mulch we used at Raikana Primary School was grass clippings.
We did not buy bags of commercial mulch from a garden centre. We found another source that was much closer to the garden.
Near the garden there is a park where grass was being cut and trimmed. When we passed the area, the cut grass had not yet been packed up or removed. It had been left on top of the grass beside the pathway.
We saw an opportunity to make use of that material rather than allowing it to go to waste.
Collecting the Grass Clippings
We collected the grass clippings using ordinary trash bags from home.
This was not a machine-operated process. We collected the grass by hand, filled the bags and carried them ourselves.
The distance from the park to the garden was approximately 1 kilometre.
That meant the mulch itself became part of the physical work of preparing the garden. We were not simply spreading material that had already been delivered to us. We had to find it, collect it, bag it and carry it to the garden before we could begin mulching.
For a small garden, finding a nearby source of suitable organic material can sometimes make mulching much more affordable.
Turning Grass Clippings Into Garden Mulch
Grass clippings can be useful mulch, but they need to be handled properly. If a thick layer of fresh grass clippings is placed down all at once, the material can compact and form a dense mat.
A compacted layer can interfere with air movement and water reaching the soil. For this reason, grass clippings are generally better applied in relatively thin layers rather than one very thick mass.
Where possible, allowing grass clippings to dry before using them can also reduce the tendency of the material to mat together.
This was especially relevant to the material we collected because we were working with grass that had already been cut and was lying around the park.
How We Applied the Grass Mulch
Once we had brought the grass clippings to the garden, we started placing them over the raised beds by hand.
We worked across the beds, spreading the grass over the exposed soil and building a protective organic layer.
The process was simple, but it was physical work. We had to distribute the grass evenly enough to cover the exposed soil without creating an excessively thick, compacted layer.
Mulch Helps Protect Soil Moisture
One of our main reasons for mulching was the hot sun.
Bare soil is directly exposed to sunlight and wind, which can increase water loss through evaporation. A layer of mulch provides a physical cover over the soil surface and can reduce evaporation.
This does not mean that mulched soil will never dry out. The garden still needs appropriate watering according to the crop, soil and weather conditions.
The purpose of the mulch is to help the soil hold onto moisture for longer rather than leaving the surface completely exposed.
Mulch Can Also Help Suppress Weeds
Another important reason for mulching is weed management.
A suitable layer of organic mulch can reduce the amount of light reaching weed seeds near the soil surface, making it harder for some weeds to establish.
Mulch does not eliminate weeds completely. Persistent weeds can still grow through gaps in the mulch, and some weeds may already have established roots underneath it.
This is why mulching works best as part of an overall garden-management system rather than as a single solution.
Mulch and the Birds, Dogs and Cats
Our situation at Raikana Primary School also gave us another reason to cover the soil.
Birds were coming into the garden and digging through the beds looking for insects and worms. We could not simply tell the birds to stay away.
Dogs and cats were another challenge because the garden was not completely isolated from the surrounding area.
Sometimes we would arrive in the morning and find animal droppings in the garden. Dogs could also dig into the beds, disturbing the soil and occasionally causing parts of the raised beds to fall.
The grass mulch gave the soil a layer of surface cover. It was not a guaranteed barrier against animals, but it helped us protect the surface of the newly prepared beds while we continued developing the garden.
Grass Clippings vs Straw Mulch
Grass clippings and straw can both be used as organic mulch, but they are not exactly the same material.
| Grass Clippings | Straw |
|---|---|
| Freshly cut grass from lawns or maintained grass areas. | Dry stems left after cereal grains such as wheat or barley are harvested. |
| Can break down relatively quickly. | Generally lasts longer before breaking down. |
| Usually needs to be applied in thinner layers because it can mat together. | Usually has a looser, more open structure. |
| Can be inexpensive or free if a safe local source is available. | Often needs to be purchased or transported from another location. |
| Breaks down relatively quickly and contributes organic matter to the soil. | Breaks down more slowly and provides longer-lasting surface cover. |
| The source needs to be considered carefully because lawn or park grass may have been treated with herbicides. | Choose clean, good-quality straw and be aware that straw can contain some viable seeds. |
Tip: Scroll left or right horizontally to view the full table.
For our garden, grass clippings made sense because we had access to a nearby source and could collect them ourselves. Straw may be a better option for another gardener depending on availability, cost and the conditions of the garden.
Important: Know Where Your Grass Clippings Come From
This is one part of using grass clippings that I would not ignore.
Because our grass came from a public park, the source of the grass matters. Before using grass clippings around vegetables, it is important to consider whether the grass may have been treated with herbicides or other lawn chemicals.
Some herbicide residues can remain in treated grass clippings and may potentially affect sensitive vegetable crops. If you do not know what was applied to the grass, it is safer to consider another mulch source that you can verify.
This is particularly important when collecting grass from parks, public spaces, neighbours or other places where you do not know the maintenance history.
How Thick Should Grass-Clipping Mulch Be?
More mulch is not automatically better.
Grass clippings can form a dense mat when applied too thickly, especially when the material is fresh or wet.
A practical approach is to apply grass clippings in a relatively thin, loose layer rather than dumping a large amount in one place.
If the clippings are very wet, compacted or forming a thick mat, it may be better to spread them more thinly and allow them to dry before adding more.
Do Not Cover the Vegetable Stem
Mulch should protect the soil, but it should not be piled tightly against the stems of growing vegetables.
When plants are eventually planted into the beds, leave some space around the stem so that the plant itself is not buried under a thick layer of wet organic material.
The goal is to cover the soil around the plant, not to bury the plant.
Mulching Before Planting
We chose to mulch our beds before planting because the beds had already been prepared but the vegetables had not yet been planted.
This gave us an opportunity to protect the soil while we continued preparing the garden.
However, the exact timing of mulch application can depend on the crop, climate and soil conditions. A thick organic mulch can also keep soil cooler, which may matter when soil needs to warm up for seed germination.
For our garden, the immediate concern was protecting the prepared beds during the hot conditions and reducing the amount of exposed soil.
Mulch Is Not a Replacement for Good Soil Preparation
Mulching works best when it is part of a larger gardening system.
Before we reached this stage, we had already cleared the overgrown land, turned the soil, removed roots and created raised beds.
Mulch was therefore another layer of preparation rather than a way of fixing poorly prepared soil.
A gardener should still think about soil structure, drainage, fertility, watering and the needs of the vegetables being grown.
Gardening Lesson
Mulching is about protecting the soil you have already worked hard to prepare.
At Raikana Primary School, we had already spent time clearing the land, turning the soil and building raised beds. Leaving those beds completely exposed would have allowed the sun, wind, weeds, birds and animals to continue disturbing the surface.
The grass clippings gave us a locally available organic material that we could collect and use as a protective soil cover. It took effort to collect and carry the mulch, but it became another practical part of building the garden.
What I Learned From Mulching the Garden
This stage taught me that gardening is sometimes about solving small problems before they become bigger ones.
We had already built our raised beds, but then we noticed birds disturbing them. Dogs and cats were also entering the garden. At the same time, the soil was exposed to the hot autumn sun.
Mulching gave us a way to cover the soil and protect the work we had already completed.
I also learned that mulch does not have to come from a garden centre. Sometimes useful organic material can be found nearby, provided that the material is suitable and its source is safe.
In our case, the grass was available at a nearby park after the grass had been cut. We collected it using bags from home and carried it approximately one kilometre to the garden.
That experience reminded me that gardening can involve resourcefulness as much as it involves tools and fertilisers.
What Came Next?
After clearing the land, turning the soil, removing roots, building raised beds and finally protecting those beds with mulch, the garden was becoming ready for the next major stage.
The soil was prepared, the beds had been shaped, and the surface had been protected.
The next step was to move from garden preparation toward the actual vegetables we wanted to grow.
At Raikana Primary School, our planned vegetables included Swiss chard spinach, garlic, kale, beetroot, onions, leeks and cauliflower.
The next part of the journey would therefore be about moving from prepared beds to planting and establishing the crops.
You May Also Like
- How to Clear Overgrown Land for a Vegetable Garden
- How to Turn Soil and Remove Roots Before Planting
- How to Make Raised Beds for a Vegetable Garden
Evergreen Hideout Gardening Journal: This article documents how we used locally collected grass clippings to mulch the raised beds at Raikana Primary School after clearing the land, preparing the soil and creating the beds.
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