GuideGarden Layouts
Build a Stone Herb Spiral for a Small Garden
A herb spiral is a mound of soil held by a low stone wall that winds upward like a snail shell. The top drains fast and gets full sun, while the bottom stays cool and moist, so herbs with very different needs grow side by side in a small space close to the kitchen.
What you will build
You will mark a circle about 6 ft (1.8 m) across, build a spiral wall of stones or bricks that rises toward the centre, fill it with a free-draining core and soil, and plant it from the top down. The wall is dry-stacked without mortar, so it is easy to adjust as you go.
Keep the wall low, rising from a few inches at the outer end to about 3 ft (90 cm) at the centre at most, so it stays stable and you can reach the top herbs. In very wet climates, put the spiral on the sunniest, best-drained spot you have.
Real-world examples
Photos of similar builds by other people, shared under open licenses. They show the idea in practice; the details differ from this guide.
Materials
- Stones, bricks or broken paving slabs, enough for a wall about 20 ft (6 m) long that rises in height
- Rubble, gravel or broken bricks for the core
- Topsoil and compost
- Sharp sand or grit to mix into the top soil
- Cardboard to smother grass under the spiral
- Herb plants
Tools
- Spade and garden fork
- String and a peg to mark the circle
- Wheelbarrow
- Rubber mallet
- Gloves and sturdy boots
Step by step
1Choose and mark the spot
Pick a sunny spot close to the kitchen door. Push a peg into the centre, tie a string about 3 ft (90 cm) long and mark a circle. Decide which way the spiral opens: the low end should face the sun (south in the northern hemisphere).
2Prepare the ground
Cut the grass short and cover the circle with plain cardboard to smother it, or remove the turf. Lay a few inches of rubble or gravel over the centre area to help drainage.
3Lay the first course of the spiral
Starting at the outer low end, lay stones along a spiral line that winds inward to the centre, leaving a planting channel about a foot (30 cm) wide between the turns. Set the bottom stones firmly into the soil so they do not slide.
4Build up the wall and fill as you go
Add stones to the wall, getting higher toward the centre. As each section rises, fill behind it with rubble in the core and topsoil above, so the soil supports the wall. Lean the stones slightly inward for stability.
5Mix soil for each zone
Mix plenty of grit or sharp sand into the soil at the top for herbs that hate wet feet. Use plain soil with compost in the middle, and add extra compost at the bottom to keep it moist.
6Plant from the top down
Plant rosemary, thyme, sage and oregano at the top; chives, coriander and marjoram in the middle; and parsley, mint and lemon balm near the bottom. Water well and keep newly planted herbs watered until they are established.
Tips for a better result
- Plant mint in a buried pot with the base cut out, or it will take over the whole spiral.
- A small pond or water bowl at the foot of the spiral adds moisture and attracts wildlife.
- Stones store heat during the day and release it at night, which Mediterranean herbs like.
- Pick herbs often; regular cutting keeps them bushy.
Common mistakes to avoid
- Building it in the shade, where the top herbs struggle.
- Making the wall too tall and steep, so it collapses after rain.
- Using heavy clay soil at the top, where Mediterranean herbs need sharp drainage.
- Planting vigorous herbs without containing them.
Safety
- Lift stones with your legs and get help with heavy ones.
- Wear gloves and sturdy boots, and watch your fingers when setting stones.
- Keep the spiral low near paths and children's play areas.
General guidance only. Follow the instructions for your tools and materials and your local rules, and use a qualified professional for electrical, gas and structural work.
Finishing up
A herb spiral packs a whole herb garden into a few square feet and looks good all year. Trim the herbs after flowering, top up the soil with compost each spring, and reset any stones that frost has loosened.
About this guide: written by the DIY Outdoor Builds editors from general, widely used building and gardening practice. Text and illustration © DIY Outdoor Builds. Photos are by the people credited under each one, used under their licenses. Found an error? Let us know.
Built one?
Share your photos, measurements and what you changed. Your build gets its own page and helps the next person.
