Herb Spiral
A spiral-shaped raised bed that creates multiple microclimates: dry and sunny at the top, moist and shady at the bottom, perfect for a compact herb garden.
Estimated cost
$20 – $60
Estimated time
2 – 3 hours
Lifespan
10+ years for stone; 4–6 years for wood
Soil needed
About 0.5 cubic yards of mixed soil and gravel
Weight empty
50–150 lbs depending on material
Weight full
300–600 lbs
Best for
Mediterranean herbs at the top, moisture-loving herbs at the bottom
Placement
Full sun. Position the spiral so the tallest point faces south in cool climates or northwest in hot climates.
Boards to Buy
| Boards to Buy | Quantity | What You Use Them For |
|---|---|---|
| Flat stones, bricks, or broken concrete | Enough for a 4 ft spiral wall | Retaining wall |
| Gravel or coarse sand | 1–2 bags | Drainage at the top |
| Quality potting mix or garden soil | 10–15 gallons | Fills pockets |
| Compost | 1–2 bags | Mixed into soil |
- ·Optional: landscape fabric under the base
Steps
- 1Mark a 4–5 ft diameter circle on flat ground.
- 2Lay the first course of stones in a spiral shape, leaving the center open for the tallest point.
- 3Build the wall up in 3–4 courses, making the center about 2–3 ft tall.
- 4Fill the center and top pocket with gravel first, then a gritty soil mix for drainage.
- 5Fill lower pockets with richer, moisture-retentive soil and compost.
- 6Plant rosemary, thyme, and oregano at the top; parsley, chives, and cilantro in the middle; mint in a contained lower pocket.
- 7Water the lower pockets more often than the top.
- 8Harvest from the top downward to encourage bushy growth.
Tools needed
- ·Shovel
- ·Wheelbarrow
- ·Work gloves
- ·Level (small)
Common mistakes to avoid
- ·Building it too tall to reach the top easily
- ·Using only potting soil — add grit for drainage at the top
- ·Planting mint in open soil instead of a contained pocket
- ·No gravel base — waterlogged top kills rosemary and thyme
Maintenance tips
Trim herbs regularly to keep shape. Refresh the top with gritty compost each spring. Weed between stones before plants seed.
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