Best Wood for Planter Boxes
A planter box is one of the harshest environments you can put wood in: wet soil against the inside face all season, sun and rain on the outside. Even rot-resistant species are consumables here, lasting years rather than decades, which is why cost weighs heavily. The best planter woods are the affordable end of the naturally decay-resistant list.
What matters here
Rot resistance in soil contact
Constant moisture makes natural decay resistance non-negotiable.
Cheap enough to be a consumable
Planters wear out. Budget-tier rot-resistant species score extra because replacement is part of the plan.
Top picks, ranked
Scored from Janka hardness, workability, seasonal movement, cost tier, and documented uses in our species database.
- Hardwood550 lbf$$ · ModerateExcellent workabilityOutdoor-friendly
Rot-resistant for soil contact · Cheap enough for a planter
Light, soft, and surprisingly rot-resistant, with a coarse oak-like grain. Easy to work and stable, an underrated outdoor and carving wood.
- Softwood420 lbf$$ · ModerateExcellent workabilityOutdoor-friendly
Rot-resistant for soil contact · Cheap enough for a planter
Lightweight, stable, and famously rot-resistant, with a rich red color, the classic premium decking and outdoor wood. Soft and easy to work, but splinters and dents.
- Hardwood1680 lbf$$ · ModerateGood workabilityOutdoor-friendly
Rot-resistant for soil contact · Cheap enough for a planter
A durable, golden-yellow hardwood related to Osage orange, valued for boat building and outdoor furniture.
- Softwood900 lbf$$ · ModerateGood workabilityOutdoor-friendly
Rot-resistant for soil contact · Cheap enough for a planter
The aromatic cedar of closets and chests, its scent repels moths, and it's highly rot-resistant. Hard for a softwood, knotty, and beautifully two-toned.
- Hardwood630 lbf$$ · ModerateGood workabilityOutdoor-friendly
Rot-resistant for soil contact · Cheap enough for a planter
Light, soft, and aromatic, resembling a lightweight ash or chestnut, with good decay resistance. The spicy root-beer scent is unmistakable. An underused outdoor wood.
- Softwood510 lbf$$ · ModerateGood workabilityOutdoor-friendly
Rot-resistant for soil contact · Cheap enough for a planter
A swamp-grown softwood famed for rot resistance and strength, stronger than cedar, ideal for anything that gets wet. Old-growth 'pecky' cypress has a prized pocketed figure.
- Softwood350 lbf$$ · ModerateGood workabilityOutdoor-friendly
Rot-resistant for soil contact · Cheap enough for a planter
Lightweight, aromatic, and naturally rot-resistant, the go-to for outdoor projects that won't see hard wear.
Deciding between two of these?
Before you buy
A plastic liner or a gap between soil and wood dramatically extends any species' life; drainage holes matter more than the wood choice.
Recommended joinery
A box that stays wet inside all season; joints must tolerate constant moisture and the wood is a relative consumable.
Screwed butt joints (coated/stainless)
Simple, replaceable, and appropriate for a wet, hardworking box that won't last forever; skip fussy joinery.
Rabbeted corners for a cleaner look
Adds glue/fastening surface and hides end grain, with corrosion-resistant screws.
Joint choice depends on the build more than the wood. Measured joint strength varies widely by wood, size, glue, and load direction, so these are ranked by suitability and reasoning rather than by a single strength number.
Different constraints?
The Wood Guide layers your budget and skill level onto these rankings and re-scores every species for you.
Picked your wood?
Build a cut list in the board-foot calculator and get the exact lumber to buy, with waste allowance.