Why Build a Herb Spiral?
Step-by-Step Instructions for
How to Build a Herb Spiral
We first cleared out the weeds and laid down cardboard with enough overlap to suppress weeds in the area surrounding of the herb spiral. Some people wet the cardboard as it breaks down faster but we didn’t bother. Then you want to use rocks (or some people use bricks) and start making your shape by constructing the outer wall first. We made ours with a 1 meter distance from the centre of the spiral to the outer wall. Some people also choose to just pile a huge mound of soil and then wedge the rocks into it.
Then we made the outline shape of the spiral using the rocks and adjusted it if we needed to while filling it in with soil as we went. We chose slightly sandier soil as were growing a lot of Mediterranean herbs in the top layers.
Once you have the first layer of rocks you can add more dirt and then wedge more rocks to build a double rock wall.
Keep on filling the spiral with dirt until it’s level with the rocks. The uppermost top has a 3 layered rock wall to give the herb spiral more height.
Here’s what the herb spiral looked like the 2nd year.
Not all the herbs were perennials. Some of them self-sowed like the chamomille (and even ended up spilling all over the place outside the herb spiral). I’ve direct seed annual herbs like basil & cinnamon basil, dill and cilantro in the ‘blanks’ that you see here.
Don’t grow invasive herbs in your herb spiral. I made the mistake of growing mint and lemon balm in ours and it’s taken over! Make sure you keep certain herbs like sage or thyme pruned over time.
Best of luck building your very own herb spiral 🙂40