Soil Mixes for Raised Beds on Concrete: Do You Need Ground Soil?

Introduction

Building raised beds on a concrete patio raises questions about soil composition and fertilizer needs.

Using Purchased Topsoil Exclusively

You can fill beds entirely with purchased organic topsoil—no need to mix in ground soil. However, you must add fertilizer since topsoil alone lacks sufficient nutrients.

Adding Fertilizer

Incorporate organic fertilizers like chicken litter (a personal favorite) or other natural amendments to provide nutrients throughout the season.

Organic vs. Regular Topsoil

"Organic" topsoil is a loosely defined term that usually means a higher price. The practical difference is minimal; use what you have and focus on adding fertilizer.

Conclusion

Fill raised beds with purchased topsoil, add organic fertilizer, and skip the extra cost of "organic" labeled soil unless you prefer it.