The Square Planter Box is built from thermally modified cedar — a chemical-free heat process that makes the wood significantly more resistant to moisture, warping, and decay. For a planter that holds wet soil and gets watered regularly, that matters. No liners, sealants, or preservative treatments required; the wood handles moisture exposure on its own.
The square footprint works on porches, patios, decks, or anywhere in the yard. Use it as a standalone planting accent, pair two at an entry point, or group multiple boxes for a larger display. It's sized to hold a meaningful volume of soil for annuals, perennials, herbs, or small ornamentals.
The thermally modified cedar construction is designed for permanent outdoor installation through all four seasons. It will not rot or warp under normal outdoor conditions. Left untreated, it will gradually weather to silver-grey. Apply a penetrating oil to maintain the original warm tone if preferred — no treatment is required.
About ThermaFusion Construction
ThermaFusion Cedar Planter Boxes are built from thermally modified wood — a chemical-free heat treatment process that permanently changes the cellular structure of the wood, making it significantly more resistant to moisture, warping, and decay than untreated cedar. No chemicals, preservatives, or coatings are involved — just heat. This makes ThermaFusion planters suitable for direct contact with wet soil and regular watering without requiring liners or sealants. Hand-built in Edmore, Michigan by Lakeland Mills.
ThermaFusion planters use thermally modified cedar that is significantly more resistant to seasonal checking and cracking than untreated wood. The thermal modification process stabilizes the wood’s cellular structure, making it less susceptible to moisture-driven movement. For more information on cedar checking, see: Cracking & Checking Info, Cracking the Mystery of Log Checking, An Academic Look Into Log Checking.
Dimensions
- Square planter box
- No liner or sealant required
- Designed for permanent outdoor installation
Shipping & Returns
Ships via UPS Ground. Most orders arrive within 1 to 3 business days of shipment. Free shipping on outdoor furniture over $149 within the contiguous 48 states. To check on a shipment or ask about your order, call 989-427-5133. Returns accepted within 30 days of delivery — contact us before returning to receive return instructions and a return authorization.
FAQ
- Does the planter box need a liner? A liner is not required. The thermally modified cedar is treated to resist moisture and decay, making it suitable for direct contact with potting soil and regular watering. A liner can be added if preferred.
- Does the cedar need to be sealed or treated? No. The thermal modification process provides moisture and decay resistance without sealants. Left untreated, the cedar will weather gradually to a silver-grey; apply a penetrating oil to maintain the original warm tone.
- Can the planter stay outside year-round? Yes. The thermally modified cedar is designed for permanent outdoor exposure through all four seasons without requiring shelter or covers.
- Does it come assembled? Planters ship with all hardware and assembly instructions included.
Manufacturer
Lakeland Mills has been manufacturing cedar products in Edmore, Michigan since 1923. For product questions or custom requests, call 989-427-5133.
1-Year Limited Warranty
This product is covered by a 1-year limited warranty against manufacturing defects in materials and workmanship. This warranty covers structural failures and defects present at time of manufacture. It does not cover normal weathering, surface checking of cedar components, or damage from misuse, modification, or exposure to conditions beyond normal outdoor use. To make a warranty claim or ask a warranty question, contact Lakeland Mills at 989-427-5133.
