Building a Herb Spiral

Herb spirals are a vertical garden design - a highly productive and energy-efficient way to grow food whilst maximising space. Herbs are the perfect plants for spiral gardens as they have a variety of requirements with regards to water, light and space, and the spiral will offer varying conditions to suit.

This type of garden utilises the natural force of gravity, allowing the water to drain down through the layers. This creates a moist area near the bottom and drier zones at the top. Microclimates are created, providing a range of conditions for different plants and their needs.

• Maximize space to grow more food
• Multiple microclimates available for optimal plant growth (plants are healthier where growing needs are met)
• Mixed or companion planting reduces insect problems and fosters beneficial plant relationships for better growth
• Manage water-use by harnessing the natural force of gravity to perpetuate the growing season
• Harvesting is easy and all plants are effortlessly accessible
• Save money by growing your own food
• Create an attractive garden feature and focal point

Planting Plan:

Think about the plants you would like to include. Some prefer good drainage and direct sunlight, whilst others prefer shade. Here is one possible spiral layout showing some herb species and where each one will grow well:

Materials:

• Cardboard
• Bricks
• Rocks or some sort of building material
• Soil or materials as for the no-dig garden (pea straw, lucerne, straw, manure, compost)
• Herbs
• Additional flowers
• Water

Construction:

1. When building the herb spiral on grass, first lay a thick bed of newspaper or cardboard with overlapping edges. Give this layer a good soaking of water.
2. Plan the spiral using the chosen building material to set out a single layer with the spiral flowing in an anti-clockwise direction (water flows anti-clockwise in the southern hemisphere). The spiral should also finish facing south, so the lowest end is the shadiest and therefore most moist section of the garden.
3. Continue laying the building blocks (bricks or stone etc.) getting higher as it spirals inwards. There are no specific rules for size and dimensions of herb spiral gardens, but a common spiral would be one metre high in the centre and one and a half metres in diameter.
4. Fill the spiral with the chosen soil medium or layer as in a no-dig garden. 
5. Plant out the herbs according to plan, considering the position of the plants. 
6. Water and watch it grow!