Frequently Asked Questions
How much soil for a raised garden bed?
A 4x8 ft raised bed at 12 inches deep needs 32 ft³ or 1.2 yd³ of soil. Mix 50 percent topsoil, 30 percent compost, 20 percent vermiculite or peat moss for best plant growth - the Mel Bartholomew 'Square Foot Gardening' formula.
Is bagged or bulk soil cheaper?
Bulk is dramatically cheaper above 1 yd³. Bagged topsoil retails at $4-6 per 40lb bag ($20-30 per cubic yard equivalent). Bulk delivery runs $25-40 per yard delivered. For projects under 1 yd³, bags are convenient enough to justify the markup.
Do I need to amend the soil?
Yes for most uses. Pure topsoil is mineral-heavy. Add 25-30 percent compost for nutrients and water retention. For acid-loving plants (blueberries, azaleas), add peat moss. For clay-heavy ground, add gypsum and coarse sand to improve drainage.
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This calculator provides estimates for informational purposes only. Results are based on assumptions and may not reflect actual outcomes. Consult qualified professionals in relevant fields before making important decisions based on these results.