One of the plants that I was keen to transplant from the garden to the allotment was comfrey (Symphytum officinalis). I had several plants, which I grew from root cuttings several years ago. Some were growing in the concrete blocks in the raised beds – which turned out to be a mistake, as they’d grown very impressive roots and wedged themselves in firmly. These ones were extracted with a sledgehammer. I took them to the allotment and planted them around my new green cone composter, and despite the terrible abuse they are still alive and growing new leaves. It’s a tough old plant.
Comfrey is a popular plant with people who practice permaculture, because it has so many uses. With deep roots that are able to bring nutrients up from the subsoil, comfrey is known as a ‘dynamic accumulator’ plant. These nutrients are stored in the leaves, which can then be used to feed other plants.
Comfrey is a very vigorous perennial, which can be cut several times each season. The composition of the leaves means that they break down rapidly and be used fresh to feed plants – either placed in planting holes or left on the soil surface as a nutritious mulch. Comfrey leaves also act as a compost activator – so adding them to the compost heap speeds up the composting process as well as adding nutrients.
You can also turn your comfrey leaves into a very good liquid fertilizer. If you drown the leaves in a bucket of water for several weeks, you’ll get a smelly liquid feed that is great for fruiting vegetables like tomatoes and peppers because it is high in potash. You can try adding scented herbs like thyme or rosemary to the mix to improve the aroma, but comfrey is different from most plants in that its leaves will happily rot down without the addition of water. Seal the leaves into a bucket for a few weeks, weighed down, and they will produce a brown liquor that can be diluted into a much less stinky liquid feed. Whichever method you choose, the remains of the rotted leaves can be added to the compost heap at the end.
And if that’s not enough – bees really love comfrey flowers, and plant has medicinal uses, although it is no longer recommended as an edible.
If you want to add a comfrey plant or two to your garden then buy root cuttings (or beg them from someone with mature plants) of Bocking 14. This variety is sterile, so it won’t self-seed all over the garden. Root cuttings are usually available from May to August. Keep new plantings well watered until they are established. If the ground is not ready for planting then your comfrey will be happy in a container for quite a while.
And if you want to do things the permaculture way, consider planting your comfrey around the compost heap. Not only will it be handy, but it will soak up any nutrients that leach out of the compost!