Quick answer
Raised beds are simple once you separate two questions: how much volume you need and what material should fill that volume. A brand-new bed usually needs a true growing soil, while an established bed may only need compost or a smaller top-up.
Raised beds are simple once you separate two questions: how much volume you need and what material should fill that volume. A brand-new bed usually needs a true growing soil, while an established bed may only need compost or a smaller top-up.
1. Measure the actual growing area
Measure the inside length and width of the bed, not the outside lumber dimensions. Then decide how much depth you are actually filling. A 12-inch-tall bed does not always need 12 inches of new soil if there is already useful soil underneath.
2. Choose soil based on what is already there
For a new raised bed or planter box, start with a product intended to function as the main growing medium. For an existing bed that has settled or lost organic matter, compost may be better used as an amendment or top-up rather than replacing the entire soil profile.
3. Do not assume more compost is always better
Compost is valuable, but it is not automatically the best material for the full depth of every raised bed. A balanced raised-bed soil gives roots structure, drainage, moisture-holding capacity and organic matter in a more complete growing medium.
4. Allow for settling
Freshly placed soil settles. A small overage can be useful, especially in deeper beds or larger installations. Our product-page quantity calculators let you add 5–10% before adding the material to your cart.
5. Finish the surface after planting
Once plants are established, a mulch layer can reduce surface drying and help keep the bed cleaner. Keep mulch away from direct contact with tender plant stems.
- For vegetables, prioritize a balanced root zone rather than the cheapest fill material.
- If the bed is very deep, call us before filling the entire volume with premium growing soil—we may be able to recommend a more efficient approach.
- Use the quantity calculator on the Raised Bed Soil product page.
Turn the guide into an order.
Use the soil finder, open a product calculator, or send Specialty Soils your project details.
Frequently asked questions
How do I know which Specialty Soils product fits my project?
Use the What Soil Do I Need tool, compare the products linked in this guide, or send us the project details for a recommendation.
Can I buy this material in bulk?
Many products are available in bulk, bagged, or both. The product page shows current formats and whether a firm online price is available.
Can Specialty Soils deliver it?
Bulk delivery is available depending on material, order size, access and destination. Exact delivery pricing is confirmed before scheduling.
Plan the complete raised-bed project
Separate new fill, existing-bed improvement and quantity before choosing a product.
