Topsoil provides mineral structure
Topsoil varies widely in texture and quality. It can form part of a bed mix, but dense or poorly graded material may drain badly when used alone in a contained raised bed.
Compost supplies organic matter
Mature compost can improve structure and nutrient supply, but pure compost is not automatically a balanced long-term growing medium. Check maturity, ingredients and local guidance.
Raised-bed mixes combine roles
Commercial and locally blended mixes aim to balance drainage, water retention and stability. Compare ingredients, usable volume and suitability for the crops rather than relying on the product name.
Practical checklist
- Calculate volume before comparing bags with bulk delivery.
- Choose materials suitable for edible crops when relevant.
