8 Materials for Raised Garden Beds: From Wood to Steel

The appeal of raised beds isn't new, but their origins are practical, not aesthetic. They solve poor soil, no soil, drainage issues, erosion, and compaction. Once built primarily from wood, today's options include concrete, stone, steel, and more—stylish and practical.

Wood

The most common and often least expensive material. Use naturally rot-resistant cedar or redwood; avoid toxin-preserved woods like creosote-soaked railroad ties. Pressure-treated wood uses alkaline copper quaternary (EPA-approved for food crops), but you may line beds with weed barrier fabric to prevent soil contact.

Pros: Easy DIY installation; widely available; suits traditional and contemporary designs; cost-effective.
Cons: Doesn't last forever—eventually needs replacement. Untreated wood lasts up to 10 years; treated lasts longer.
Cost: Cedar/redwood up to $150/bed; pressure-treated $75–$100.

Concrete

Urban landscape elements like concrete have become chic and trendy—flexible for most garden styles.

Pros: Properly installed, lasts indefinitely; works in traditional, contemporary, or global styles (Spanish courtyard, Mexican stucco); can be tinted to match or contrast structures.
Cons: Expensive; not a DIY project in most cases.
Cost: Materials inexpensive but labor-intensive. ~$30/sq ft; more with sloping yards or difficult prep.

Masonry

Chameleons of the garden world—fit nearly any style depending on rock type. Handy DIYers may self-install; most hire masonry crews.

Pros: Permanent addition; supplies widely available; attractive; can match home exterior.
Cons: Costly depending on rock type.
Cost: $5–$10/sq ft or more for premium rock.

Cinderblock

Stack to desired height, or mortar in place with surface treatment and capped tops for elegance. Stacked = rustic/inexpensive; mortared = elegant/pricier.

Pros: Very inexpensive and widely available (home improvement stores); fits rustic to urban to elegant aesthetics; durable.
Cons: Heavy pieces—difficult solo.
Cost: Materials $9–$15/sq ft. Professional with cap stone and stucco: triple that.

Rock

Easy DIY for average homeowners. Small boulders or large cobbles, no mortar needed for low walls (12 inches or less). Straight or curved beds; larger rocks push together, smaller nestle.

Pros: Casual cottage look; easy DIY; no special equipment; materials widely available.
Cons: Doesn't suit every landscape style; not permanent (but flexible if you change bed shape/location).
Cost: Free if on property; otherwise $85+/cubic yard. Sold by cubic yard, pound, or ton—verify pricing.

Galvanized Culvert

Typically used for road drainage, sliced sections make stylish contemporary planters. Building supply stores carry them; also check online for "free pickup" discards.

Pros: Cool contemporary look; readily available; easy install (no assembly); permanent; more height/size control than stock tanks.
Cons: May need to call around; pay for cutting into sections; need truck or delivery; more expensive than stock tanks.
Cost: 20–30 ft lengths, various widths. ~15 two-foot-tall, 36-inch-wide planters for $900.

Stock Tanks

One of the easiest options. Round or rectangular with rounded ends, used for livestock, now popular for urban chic. Only work: drill ¼- or ½-inch drainage holes in bottom.

Pros: Available at feed stores; inexpensive; no assembly; last indefinitely; movable for redesign; various sizes.
Cons: Need truck or delivery; sides heat up in summer (typically not scorching).
Cost: $30–$150 depending on size.

Steel (Cor-Ten)

Industrial elements add rustic sophistication. Cor-Ten comes in 3/16 or ¼-inch sheets. Starts natural steel color, weathers to stunning rusty patina. Chemical processes can accelerate patina but risk rusty runoff.

Pros: Contemporary aesthetic; slim profile; naturally weather-resistant; long-term.
Cons: Pro installation recommended (difficult, heavy); costly; not available everywhere; avoid salt-spray areas (rapid deterioration); heats soil—poor for heat-sensitive plants; edges get hot—place in part shade or use non-cascading plants.
Cost: Simple 2x6 ft Cor-Ten planter: $1,200+ depending on location.