Build a Flagstone Raised Bed for Your Vegetable Garden

Inspired by the stone walls at England's Chelsea Flower Show, Marilyn Herlihy Dronenburg of Fallbrook, California, created beautiful mortarless raised beds using dry-stacked flagstone. She chose "patio-cut" flagstone—1½-inch-thick slabs roughly 8 to 18 inches wide—that stacks easily, making it ideal for this project. Her beds measure 5½ by 11 feet and stand about 2 feet tall.

Key Guidelines

Limit wall height to 3 feet or less; taller walls require a special footing. Flagstone is available at most building material and garden supply centers, with prices varying by cut, thickness, and color. Dronenburg used about 3 tons of Arizona flagstone per bed (approximately $190–$280 per ton, plus delivery).

Materials Needed

• String
• Tape measure
• Powdered limestone or gypsum
• Soil
• Shovel
• Flagstone
• Heavy work gloves
• Protective goggles
• Narrow cold chisel or brickset
• Hand sledge
• Scrap wood
• 4-foot level

Construction Tips

Lay out the bed with string and mark lines with powdered limestone. Excavate a shallow trench, then stack stones, staggering joints for stability. Use a level frequently. Backfill with soil as you build. The result is a durable, attractive raised bed that adds structure and charm to any vegetable garden.