Understanding how and when to use compost, lawn dressing, and potting soil can dramatically improve the health and success of your garden or landscaping project. These soil-enhancing products are key to creating healthy, nutrient-rich environments for lawns, garden beds, and potted plants. Whether you’re a home gardener or a professional landscaper, the timing, method, and quantity of each material are crucial for achieving lush, thriving plants.
Compost
For Home Gardeners, compost is a powerhouse of organic matter that replenishes soil nutrients and encourages microbial activity. The best times to apply compost are early spring and autumn. In spring, compost revitalises the soil after winter and prepares it for planting. In autumn, it helps improve structure and feeds soil life during the off-season.
How to use compost
Spread a 2–5 cm thick layer over your beds and gently dig it into the top 10–15 cm of soil. You can also use compost as a mulch or mix it with soil when planting.
Recommended Quantity – For general soil improvement, use 20 to 50 litres per square metre depending on soil condition. Poorer soils may need a thicker application or soil amendments.
For Landscapers, compost is invaluable during new landscape installations. Use it to condition soil before laying turf, planting flower beds, or installing trees and shrubs. It improves drainage, encourages deep root growth, and supports long-term soil fertility.
Signs of Quality Compost
- Rich, dark colour
- Crumbly texture
- Earthy smell (not sour or rotten)
- Free from visible plastic or large chunks
Look for compost that is weed-free, well-decomposed, and balanced in nitrogen and carbon content.
Lawn Dressing
For Home Gardeners, lawn dressing is a top layer applied to existing lawns to improve root development, fix low spots, and encourage thicker growth. The ideal times to apply lawn dressing are early spring and early autumn when the grass is actively growing.
How to use lawn dressing
First mow your lawn, then apply a 0.5–1 cm layer of lawn dressing evenly over the surface. Use a stiff broom or rake to work it in between the blades.
Recommended Quantity – Use 5 to 10 litres per square metre depending on how uneven or depleted your lawn is.
For Landscapers, lawn dressing is used in turf establishment, lawn rehabilitation, and routine lawn care maintenance. It is also helpful after aeration or dethatching to encourage quick recovery and better root-to-soil contact.
Signs of Quality Lawn Dressing
- Fine, crumbly texture
- Free of stones, weeds, or clumps
- Balanced mix of screened topsoil, compost, and sand
A good lawn dressing should allow air and water movement while supplying a light nutrient boost.
Potting Soil
For Home Gardeners, potting soil is essential for container gardening, as it offers the right balance of drainage, aeration, and nutrients for potted plants. Refresh your potting soil once a year, ideally in early spring before the growing season kicks off.
How to use potting soil
Replace old potting soil completely for plants showing poor growth or top up with fresh mix if the soil has settled. Always ensure your potting mix is moist before planting.
Recommended Quantity – One 30-litre bag typically fills a medium pot (30 cm wide). For larger container areas or raised beds, calculate by volume using 20–30 litres per square metre depending on depth (at 10–15 cm deep).
For Landscapers – Use potting soil when planting in containers, vertical gardens, rooftop installations, or indoor green walls. It is vital for ensuring plant success in non-soil environments where natural drainage and microbial activity are limited.
Signs of Quality Potting Soil
- Light and airy texture
- Drains well but retains moisture
- Contains organic matter, perlite or vermiculite, and compost
- Free of pests, pathogens, and unpleasant odours
Avoid potting soils that feel soggy, smell sour, or appear compacted. A healthy potting mix should feel springy and slightly moist.
Professional tips
- Always water thoroughly after applying compost or lawn dressing.
- Avoid over-dressing lawns, which can smother grass.
- Combine compost with humic or fulvic acid in winter to improve soil biology.
- For best results, use organic, weed-free, and screened products.
At earthworm.co.za, we supply high-quality organic, weed-free screened compost, lawn dressing, and potting soil designed to give your garden or landscaping project a healthy, fertile start. Whether you’re prepping your spring garden or installing a professional landscape, using the right products in the right way makes all the difference.
A great garden starts from the ground up.
