Cedar dominates garden woodworking discussions, but it is not the only option — and it is not always the best choice for every budget, climate, or project type. Pine, redwood, and pressure-treated lumber each have distinct performance profiles that make them appropriate for specific applications. Understanding how these species compare helps make an informed choice rather than defaulting to cedar by reputation alone.
The Comparison Framework
Four factors matter most when choosing lumber for garden structures: natural durability (how long it lasts untreated), cost, food safety (relevant for raised beds and planters growing edibles), and regional availability. A fifth factor — appearance — matters for decorative planters and visible garden structures but is secondary in utilitarian applications.
Cedar: The Benchmark
Cedar establishes the baseline for this comparison. Natural durability: 15 to 25 years in soil contact for heartwood-dominant boards. Cost: moderate to high, varying significantly by region and grade. Food safety: unambiguous — natural, untreated, no added chemicals. Availability: excellent across most of North America, though regional species vary (Western red cedar in the West, Eastern white cedar in the Northeast).
Cedar's weaknesses: higher cost than pine, lower structural density than redwood, and variable heartwood content depending on source and grade. A detailed overview of cedar's properties is covered in the cedar raised bed guide.
Pine: The Budget Alternative
Untreated Pine
Untreated pine — Southern yellow pine, white pine, ponderosa pine — is the least expensive dimensional lumber available at any retail source. It is also the least durable. Untreated pine in soil contact will begin showing significant decay within 3 to 5 years in most climates, and structural failure in a raised bed application can be expected within 7 to 10 years even in dry climates.
Pine's low cost is real, but the short replacement cycle changes the economics. Two or three pine raised beds over 20 years may equal or exceed the cost of one cedar bed, plus the labor of repeated reconstruction. For gardeners experimenting with raised bed placement or starting with a limited budget, pine is a reasonable first-generation choice. For permanent installations, the math favors cedar.
Untreated pine is entirely food-safe — same food safety profile as cedar. The only issue is durability.
Treated Pine
Pressure-treated pine extends the durability of a naturally susceptible species by forcing copper-based preservatives into the wood under pressure. Modern treatments — ACQ (alkaline copper quaternary) and CA (copper azole) — replaced CCA (chromated copper arsenate) in 2003. Current scientific consensus is that copper leaching from modern treated lumber into garden soil is very low, unlikely to accumulate to harmful levels in normal food-growing applications, and well below levels that damage plants.
That said, uncertainty about long-term soil accumulation makes many gardeners prefer to avoid treated wood in food beds, even with modern formulations. The debate is genuinely unsettled in terms of long-term ecosystem effects, and precautionary approaches are reasonable.
Pressure-treated pine's durability advantage over cedar is real for full-soil-contact applications like fence posts and ground-contact structural members. For raised bed walls where soil contact is partial, the gap narrows considerably. Treated pine is also significantly harder to work by hand than cedar — denser, heavier, and more prone to splits near fasteners.
Redwood: The Premium Alternative
Redwood (Sequoia sempervirens) is often discussed alongside cedar as a premium option for outdoor garden structures. Its natural durability is comparable to Western red cedar — both are rated highly resistant to decay — and its appearance is often considered superior, with a consistent reddish-brown color and fine, even grain.
The practical limitations of redwood are significant. It is expensive — typically 30 to 60% more per board foot than comparable cedar grades. It is also geographically restricted; old-growth redwood is protected, and sustainable harvest of second-growth redwood is limited to Northern California and a narrow Pacific coastal strip. Outside the West Coast, redwood is available through specialty yards at significant shipping cost premiums.
For gardeners in Northern California who have access to locally-sourced second-growth redwood, it is an excellent choice. For everyone else, the combination of premium price and high transport cost makes it a difficult recommendation over locally-available cedar.
Black Locust: The Underrated Option
Black locust (Robinia pseudoacacia) deserves mention because it is native to eastern North America, produces wood with exceptional rot resistance — significantly better than cedar in prolonged soil contact — and grows quickly enough to be harvested sustainably from farm woodlots.
Black locust is far less available as milled lumber than cedar or pine. Finding it requires seeking out regional specialty mills or farmers who manage locust stands. Where it is available, it is typically less expensive than cedar. For gardeners near sources, black locust offers the best natural durability of any native North American wood for soil-contact applications.
Douglas Fir: The Structural Alternative
Douglas fir is stronger and stiffer than cedar, making it appropriate for structural applications where span and load-bearing matter — garden trellises, pergolas, arched structures, and long-span overhead elements. Its natural durability is moderate — better than pine, well below cedar in soil contact.
For tall raised beds or tiered garden structures where structural rigidity is the primary concern, the structural superiority of Douglas fir may justify its shorter service life in soil-contact components. Treat the base boards with cedar (for durability) while using fir for the upper courses (for rigidity and cost efficiency) — a hybrid approach that optimizes performance at each position in the structure.
Composite Lumber: The Maintenance-Free Option
Composite lumber — engineered from wood fiber and recycled plastic — is rot-proof, maintenance-free, and increasingly available in standard dimensional sizes appropriate for raised bed construction. Its drawbacks: higher initial cost than most natural lumber, petroleum-based material content, non-biodegradable, and a synthetic appearance that many gardeners find aesthetically jarring.
Composite raised beds are gaining traction among gardeners who prioritize permanence and zero maintenance over aesthetics and natural material content. They are a legitimate option for urban rooftop gardens and other settings where structural permanence and weight are paramount.
Side-by-Side Summary
- Cedar: 15–25 years, moderate cost, food-safe, widely available. Best overall for most garden builds.
- Untreated pine: 5–10 years, lowest cost, food-safe, available everywhere. Best for temporary or first-generation builds.
- Pressure-treated pine: 25–40 years, moderate cost, food-safety debate, widely available. Best for full-soil-contact structural applications where cedar performance is insufficient.
- Redwood: 15–25 years, high cost, food-safe, West Coast only. Best for West Coast builders with access to local supply.
- Black locust: 25–40 years in soil contact, low to moderate cost (where available), food-safe, limited availability. Best for East Coast builders near regional mills.
- Composite: Indefinite, high cost, food-safe, increasingly available. Best for permanent installations where aesthetics are secondary.
For the vast majority of raised bed and garden planter projects — whether a first beginner vegetable garden or an established raised bed system — cedar remains the most practical choice when cost, durability, food safety, and availability are weighed together.
Frequently Asked Questions
Is pressure-treated lumber safe for growing vegetables in raised beds?
Modern pressure-treated lumber using ACQ or CA formulations is considered acceptable for vegetable beds by most extension services and regulatory bodies. Independent studies have found minimal copper uptake in food crops from soil adjacent to treated lumber. Gardeners who prefer to use no treated products near food crops can line bed interiors with polyethylene sheeting as an additional barrier, or simply choose untreated cedar.
Why is untreated pine used in so many raised bed plans despite its short lifespan?
Pine's dominance in beginner raised bed guides reflects its universal availability, low cost, and ease of working. Many first-time raised bed builders use pine to test placement and layout before committing to a permanent cedar installation. It is a reasonable starting-point material even if not the best long-term choice.
Can cedar and pine boards be mixed in the same raised bed?
Yes. A common strategy is to use cedar for the bottom course — the boards in direct soil contact that are most exposed to decay — and pine for upper courses that experience less moisture stress. This concentrates the cedar premium where it delivers the most value.
Is redwood from a hardware store actually old-growth redwood?
No. Old-growth redwood harvest is heavily restricted in California. Hardware store redwood is second-growth material, which has similar species characteristics but younger wood with lower extractive content in the heartwood. Second-growth redwood is still a durable, attractive wood but may not perform quite as long in soil contact as old-growth figures historically suggested.
How does the environmental impact of cedar compare to pressure-treated pine?
Untreated cedar has a lower environmental footprint than pressure-treated pine when sustainably sourced — no chemical treatment, no disposal concerns, and biodegradable at end of life. Pressure-treated lumber requires more careful disposal (not suitable for burning or composting due to copper content) and its production involves chemical processes not present in natural cedar. FSC-certified cedar from well-managed forests is among the most environmentally sound lumber choices available for garden construction.