If you’re asking how many worms per square metre for raised beds, you’re not alone — it’s one of the most common questions gardeners have when trying to improve soil health. Raised beds often contain very few natural worms, especially if they’re filled with bought-in soil. Adding the right number of worms helps speed up nutrient cycling, improve drainage and get plants growing better, faster.
A Simple Rule of Thumb
For healthy, productive raised beds, aim for around 10–15 garden worms per square metre, plus a small population of composting worms near the surface to process organic matter.
A good, simple guide is:
For healthy, productive raised beds, aim for around 10–15 garden worms per square metre, plus a small population of composting worms near the surface to process organic matter.
A good, simple guide is:
- 10–15 deep-burrowing garden worms per m²
- 50–60 g of composting worms per m²
This combination works at different soil levels — garden worms improve structure and aeration deeper down, while composting worms break down compost and mulch on the surface.
An Easy Way to Get the Right Amount
Our Worms for Raised Beds Kit is designed around this exact balance. For example, the small kit contains enough worms for roughly 4 m² of raised bed, making it easy to scale up depending on how many beds you have. Once introduced, worms naturally regulate their numbers based on food and conditions — so you don’t need to worry about adding too many.
Our Worms for Raised Beds Kit is designed around this exact balance. For example, the small kit contains enough worms for roughly 4 m² of raised bed, making it easy to scale up depending on how many beds you have. Once introduced, worms naturally regulate their numbers based on food and conditions — so you don’t need to worry about adding too many.
Add worms in spring or autumn, pop them into a few small holes across the bed, cover with compost or mulch, and keep the soil moist. With the right number of worms in place, raised bed soil usually improves year on year — with less effort and better harvests
