My Garden Project: The Herb Spiral – Design and Layout
The minute I learned of the existence of herb spirals I wanted one, but the task always seemed so daunting to undertake. This year instead of dreaming about it, we actually decided to do it! It has been a little challenging, mostly trying to find the time to do it, but so far it is well worth the effort.
What is Herb Spiral?
(Imagine from Growing Herbs for Beginners)
There are lots of resources online about permaculture and herb spirals. I am not an expert in either of these things, so I will stick to the basics. If you want to learn the finer details I encourage you to check out the many resources available online and in books.
A herb spiral is a permaculture concept that allows you to grow a variety of herbs, many requiring different growing conditions, in a confined and compact space. Because of its vertical design this style of garden is incredibly energy efficient and productive. It’s also an excellent solution for people like me who have a very small space to grow things in. Although you can still have one if you have acres to play with!
Because it is built in a spiral, this garden design takes advantage of gravity which allows water to drain downwards to all the layers. This creates a dryer climate at the top and a moister growing area at the bottom. The spiral also creates microclimates, meaning you will have areas with lots of sun, areas with mostly shade and areas that are sheltered.
Building a Herb Spiral – What We Did
Traditionally herb spirals are made with bricks, stones, rocks or blocks of some kind. This keeps the garden insulated a night and helps retain heat during the day. Early on we decided that if we were going to do this we needed to keep the costs low.
At first I started searching Kijiji for anyone giving away or selling bricks or stones. I wasn’t having much luck. Almost every time I found a post for free bricks they were gone within hours. I decided to create my own ad asking for free bricks or landscaping stones. Within 24 hours I had three responses. In two days of hauling we got all the bricks we needed for our project completely for free.
Pick Your Spot
In our backyard we don’t have much in the way of options for where to put our spiral, but if you have a larger yard you will have the luxury of some choice. Traditionally a herb spiral is placed close to the kitchen, allowing you to run out your door and grab whatever ingredients you might need for the meal you are preparing. Not an option for us but a lovely idea.
Level and Prepare Your Spot
Since you will be creating a structure that will hopefully last some time it’s a good idea to try to make the ground underneath it as level as possible. Our yard is incredibly sloped and full of holes and bumps. Prior to laying our cardboard down we used dirt and mulch to help level out the spot we chose.
The cardboard helps to prevent any grass or weeds from infiltrating your spiral. It’s an easy way to prepare a site for a garden box or in this case, a herb spiral. You can also use gravel or landscaping fabric.
Plan Your Spiral
Next we marked the centre of our spiral and created a circle (using bricks as markers). Traditionally herb spirals range from 1.5-2 metres in diameter. We went with 1.6 metres (about 5.5 feet). In all honesty they can be as large or as small as you would like them. We wanted to be able to easily reach the herbs at the top of the spiral without worrying about falling or balancing on the bricks precariously!
In permaculture the bottom of your spiral (or pond if you so choose) is normally oriented to the south in the Southern Hemisphere and to the north in the Northern Hemisphere. Living in Ontario, Canada that would mean according to permaculture we should have oriented the bottom of the spiral to the north. The reason for this is to plant according to sun, shade and water requirements. That being said you must take into consideration your space and the sun exposure you have. Our backyard is northwest facing. That means our home and a very large tree blocks our southern sun. In order to compensate for this we needed have our opening face the southwest. Had we followed traditional models and not taken into consideration our land/plot our shade loving herbs would have baked in the sun and our sun lovers would not have received the light they needed. Permaculture is all about working with the land you have and working in harmony with its natural rhythms.
We decided against a pond at the bottom of the spiral for fear of my son stepping in it. However it can easily be added in at another time. The pond can be used for frogs and/or to grow watercress.
Building Your Spiral
This was by far the most tedious part! Thank goodness I have a strong marriage because we were bickering by the end. We changed the orientation of the bottom of our spiral twice (above picture was in the incorrect orientation for our backyard) and were constantly shifting bricks around to make it look just right. My husband pointed out that ironically we did a much better job during our trial run on the patio because we didn’t care about it being exact. We just eyeballed it. Once we broke out the tape measure things got hairy. My only suggestion is to have patience and to work within your own strengths.
You will want to gradually increase the height of your spiral as you go along. We discovered that once you lay down your foundation row it is actually much easier to work from the centre outwards as the rows start to get to high. Trial and error my friends!
We made the lower level of our spiral two rows high and ended up with a centre being six rows of bricks high. Traditionally herb spirals end up being about 1 metre (2.5 feet) high.
Next time I’ll talk about filling your herb spiral