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Filling Foundation Planters: Soil Blend Ratios, Bulk vs. Bagged, and Cost-Effective DIY Tips

Retaining wall around foundation, two 9×4 ft planters. Quote $150 for soil + gravel. Can't afford; will buy bagged soil and DIY. Asks soil type, mix, bag cost, plant suggestions. Chicago area.

Ideal Mix

60–70% native soil + 30–40% organic matter (ground bark, compost). Bagged topsoil alone lacks clay for water retention.

Sourcing

Check local bulk soil company for native topsoil delivery, then blend with fine pine bark or cotton burr compost.

Volume

1 ft deep = 36 cu ft per planter.

Cost Verdict

$150 is reasonable if soil blend is right—labor is significant.

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