A wooden planter box does more for curb appeal per hour of building time than almost any other outdoor project — a single afternoon build that transforms a porch, deck, or entryway. Building from solid planter box plans also means you can size boxes exactly for the plants you want to grow, rather than compromising with whatever fits a retail container.
This guide covers planter styles for different placements, the drainage and liner details that determine whether your box lasts years or rots within one season, and sizing guidance based on what you’re planting.
Why Drainage Design Matters More Than Looks
A beautifully built planter box that traps water at the bottom will rot from the inside out within a season or two, regardless of how well the joinery was cut. This is the one detail worth more attention than the box’s appearance — proper drainage holes, and ideally a slight gap or feet lifting the box off the ground, are what separates a planter that lasts a decade from one that needs rebuilding every year.
Planter Box Styles
Simple Rectangular Planter
Best for: Beginners, porches, entryways, herb gardens
Build difficulty: Beginner
Materials cost: $20–$50
Build time: 1–2 hours
A basic box with butt-jointed corners, drainage holes drilled in the bottom, and optional feet for airflow underneath. The fastest, most forgiving outdoor woodworking project — a genuine one-afternoon build even for a complete beginner.
Tiered/Multi-Level Planter
Best for: Visual interest, varied plant heights, small footprint gardens
Build difficulty: Intermediate
Materials cost: $50–$120
Build time: 4–8 hours
Multiple planter boxes at staggered heights on a shared frame, letting trailing plants cascade from upper tiers while taller plants anchor the base. Requires more structural planning since the frame supports multiple soil-filled boxes at once.
Self-Watering Planter Box
Best for: Low-maintenance gardening, vacation-friendly plants
Build difficulty: Intermediate
Materials cost: $60–$130
Build time: 4–6 hours
Includes a built-in water reservoir at the bottom with a wicking layer, reducing watering frequency significantly. Requires careful liner and overflow design to work reliably — get the reservoir sealed properly or it defeats the purpose by leaking.
Sizing Guide by What You’re Growing
| Plant Type | Minimum Depth | Notes |
|---|---|---|
| Herbs, succulents | 6–8 inches | Shallow root systems, good for small entryway boxes |
| Flowers (annuals) | 8–10 inches | Standard planter depth for most seasonal flowers |
| Vegetables (peppers, lettuce) | 10–12 inches | Needs real soil volume for consistent moisture retention |
| Small shrubs, dwarf trees | 16–20 inches+ | Best built as a larger, structurally reinforced box |
Material and Liner Choices
Cedar: The standard choice for outdoor planters — naturally rot-resistant even with constant soil and moisture contact. Costs more than pine but lasts significantly longer without a liner.
Pressure-treated lumber: Long-lasting and budget-friendly, though a plastic liner is worth adding as a buffer between soil and wood, especially for food-growing boxes.
Plastic liner: Adding a liner (or repurposed nursery pot) inside any wood planter dramatically extends its life by keeping constant wet soil off the wood directly — cut drainage holes in the liner to match the box’s drainage holes.
Hardware: Stainless steel or coated deck screws prevent the rust staining that regular screws cause on light-colored wood exposed to constant moisture.
Common Planter Box Mistakes
- Insufficient drainage holes: A single small hole isn’t enough — space multiple 1/2 to 3/4 inch holes across the bottom to prevent water pooling after heavy rain or watering.
- No airflow underneath: A planter sitting flush on a deck or porch traps moisture against the bottom board. Small feet or a raised frame extends the box’s life considerably.
- Skipping the liner on softer woods: Pine or fir without a liner breaks down fast in constant soil contact — a liner is a small step that meaningfully extends the box’s lifespan.
- Building without considering final weight: Filled soil is heavy — a large planter box can weigh over 100 lbs once filled and watered. Plan placement before building, since moving it afterward isn’t simple.
Small Build, Big Impact
A planter box built from proper planter box plans is one of the best return-on-time projects in outdoor woodworking — a few hours of work for years of curb appeal. Get the drainage right from the start, and even a simple rectangular box will outlast anything from a garden center.
For anyone wanting complete plans covering tiered and self-watering planter variations, Ted’s Woodworking includes several planter designs within its broader project library.