Step-by-step instructions
Step 1
Choose the planter dimensions from mature root depth, location, and the total wet weight the support surface can carry.
Step 2
Create a cut list for sides, ends, base slats, and feet using actual board thickness and planned drainage gaps.
Step 3
Cut and label pieces, predrill near cedar ends, and dry-fit the box square.
Step 4
Glue where appropriate and fasten with corrosion-resistant screws, keeping base slats supported and drainage paths open.
Step 5
Ease sharp edges, finish exterior surfaces if desired, and allow full cure before adding screen and potting mix.
Step 6
Fill and water gradually while checking drainage, then lift the planter clear of surfaces that could trap moisture.
Wet soil makes large planters extremely heavy. Confirm the deck, balcony, or support surface capacity; wear eye protection when cutting and avoid finishes not suitable for the intended plants or food contact.
