I have been lucky to come across two herb spirals in the last month. Herbs that need good drainage are planted at the top of the raised garden bed. Plants which need good sunlight are planted on the side that receives the most sunlight and shade loving plants are planted on the other side.
Northey Street City Farm herb spiral
The first herb spiral was at Northey Street City Farm. It is approximately 1 metre high by 3 metres wide with three different levels for herbs. The top level is well drained and drier, while the bottom level is moister and cool. Different plants are planted on different levels depending on their needs.
Raised spiral gardens offer a range of micro-climates to meet the habitat needs of different plants. Raised spiral gardens are also very space efficient, and conserve water. A herb spiral can add detail to an otherwise flat or boring landscape.
Queensland Plant Expo herb spiral
The herb spiral at the Queensland Plant Expo was smaller and probably a better size for most suburban backyards. It had only two levels and the spiral was made with stones to define the different areas. You can see they have used straw mulching to keep the weeds away.
Herbs for a herb spiral
Herbs that prefer moist conditions (plant these near the bottom of the spiral facing the morning sun):
- French tarragon
- Lebanese Cress (in a pot)
- Lemon balm
- Mint (in a pot)
- Mushroom plant
- Vietnamese mint (in a pot)
Herbs that prefer or handle drier conditions (plant facing the summer sun and on top of the spiral):
- Garlic chives
- Society garlic