Keith has been involved in the gardening and landscaping industry for the past 21 years. From a jobbing gardener to running his own landscaping services....
There are many benefits to choosing to top dress a lawn. In short topdressing is beneficial because it provides nutrients to the soil, increases water retention, and suppresses weeds. It also makes the lawn appear healthier and greener.
Below we will look at the benefits of top dressing a lawn and some of the disadvantages that you should weigh up.
What does top dressing a lawn do?
The process of top dressing is a lawn renovation technique, where compost, sand, washed green waste, or similar material is applied to the lawn to improve soil structure, fertility, and appearance.
Does Top-Dressing a Lawn Help?
Topdressing is popular because it provides a simple way to add nutrients to the soil, increase water retention and prevent erosion. In addition, it helps to suppress weed growth and improves the look of the lawn.
Over time, soil can be compacted, which can prevent nutrients from reaching grass roots. Top dressing a lawn can relieve compaction, improve drainage, and encourage deep rooting.
Top dressing a lawn can also improve soil structure and help neutralize soil acidity, which can encourage earthworms and other beneficial soil organisms.
Benefits of top dressing a lawn with sand
Many gardeners love to add sand to their lawns because they believe it improves their appearance. But what exactly does it do? And why should you consider adding sand to your lawn?
Sand is a natural, inexpensive option for top dressing. It’s lightweight and easy to spread, but it does require some maintenance. Sand tends to compact over time, so you’ll want to rake it back into place after each rain.
There is nothing novel about using sand as a top dressing. Sand in fact has been used for centuries to improve soil quality.
Soil varies from area to area and there is no type of top dressing that is best for all types of soil. In many instances, You can often get better results by combining different types of top dressing. Sand is often mixed with other materials, such as compost or fertilizer, to suit the soil on which you are laying it.
One of the key benefits of sand as a top dressing for lawns is that it can improve drainage and prevent waterlogging. Sand also helps retain moisture in the soil, which makes grass greener and healthier.
But there are some downsides to using sand. For example, it can cause compaction and erosion problems. If you decide to use sand, you’ll want to apply it at least twice per year.
Benefits of top dressing lawn with compost
Top dressing’s primary goal is to improve the soil’s fertility and ecosystem. This is best achieved through adding organic matter to the soil before planting. Because compost is a mixture of decomposed organic material, generated by millions of microorganisms, it makes it a very good material to use as a top dressing.
Compost contains nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, copper, iron, zinc, manganese, boron, molybdenum, chlorine, and other trace elements. These nutrients are essential for plant growth and development.
The idea behind top dressing is to add nutrients to the soil through the addition of organic material. Compost contains nitrogen (N), phosphorus (P), potassium (K), and various other nutrients that are essential for plant growth and development.
Compost is also teeming with millions of beneficial bacteria, fungi, and protozoa that break down both organic and inorganic material that exists in the soil building a developing a beneficial soil ecosystem
Thus the benefits of top dressing a lawn are substantial and have several advantages over other methods. In particular, compost is free if produced yourself, is readily available, and does not require additional equipment. In addition, compost improves soil structure and increases water retention capacity.
Benefits of Top Dressing
- Top dressing is less expensive
- It can be done to lawns with or without grass
- It can help control thatch
- neutralize soil acidity,
- encourage earthworms and other beneficial soil organisms.
- Top dressing only needs to be applied every two to three years
- It can help control weeds
Disadvantages of Top Dressing
As with most things, there are some disadvantages of top dressing that need to be considered. For example, it can cause compaction, which rather than improving can lead to poor drainage and reduced water absorption. Also, it can attract pests such as aphids and ants.
Many of the disadvantages can be avoided with careful selection and mix of materials that you are going o use for top dressing. It is important to understand the type and nature of your soils and use the correct bend of material to achieve the best results.
- Top dressing does not always help control soil erosion
- can cause drainage problems with the wrong material mix
- Possible damage to the existing grass
- needs to be applied every couple of years
- Attracts pests and insects
There are some gardeners that believe that top dressing harms the environment. They argue that it encourages the growth of invasive species and contributes to erosion. Others say that top dressing is unnecessary if a lawn is well maintained.
Top dressing a lawn is not a ‘quick fix’, but can improve the quality of the soil and encourage grass growth, which, in turn, will improve a lawn’s health and appearance. The most benefits of top dressing a lawn come when applied in after preparing first by aerating and then scarifying.
There are disadvantages of top dressing, the main one being that it is a process that needs to be repeated every couple of years, depending on soil quality and usage. The other consideration is environmental impact although for many the benefits outweigh the drawbacks.
 University of Florida: Soil and nutrient management: Compost and manure