Keyhole Garden Beds: Build a Productive, Accessible Raised Bed System

Keyhole gardens—horseshoe or circular beds with a central access path—maximize growing space in small areas while minimizing bending. Originating in permaculture, they're ideal for vegetables, herbs, and flowers, and adapt easily to individual needs.

Design Principles

Place frequently harvested/high-maintenance plants nearest the center for easy reach. The keyhole shape (24-inch center radius, 5–6 foot outer radius) allows access to all plants without stepping on soil.

Construction Methods

Raised Keyhole Beds (Most Popular)

1. Stake center; mark 24-inch radius for access path
2. Mark 5–6 foot outer perimeter
3. Build walls (stone, boards) to 3–4 feet high
4. Fill with quality soil/compost mix

Sheet Mulching (No-Dig)

Layer wet cardboard/newspaper on grass in keyhole shape. Add straw, then compost/soil on outer edges for planting, leaving center opening. Builds into raised beds over time. Can include central focal point (tree, water feature).

Rock Wall with Central Compost Basket

1. Level 6.5-foot diameter area near water source
2. Mark 16-inch center basket with 4 stakes (5 feet tall), lined with permeable material
3. Build flat-stone wall around basket to 4 feet high, leaving 1.5–2 foot keyhole opening
4. Fill with layered compost: kitchen scraps, sticks/twigs/leaves, soil—repeat

Keyhole gardens yield productive, organic harvests in any climate, any space, with minimal effort.