We cut down comfrey to make our own organic comfrey feed here at Bridge Cottage at the end of May or beginning of June to make a feed for our tomatoes, peppers, cucumbers, dahlias and clematis, hanging baskets and indoor pot plants. this process then continues throughout the summer, as comfrey if fast-growing.

 

Comfrey is an excellent source of potassium, an essential plant nutrient for flower, seed and fruit production. Its leaves contain 2-3 times more potassium than farmyard manure. The comfrey root grows very deep, tapping sources of potassium in the subsoil that would not normally be available to plants and thus makes comfrey a superb plant for the organic gardener who is looking to use homemade, organic means of fertilising crops. We also add nettles to the mix, as they contain nitrogen, which is important for leafy growth

 

Other plants to add to the comfrey feed bucket are nettles, rich in nitrogen and borage.

We like to leave the cutting of comfrey until the bees have had their fill of the nectar from the flowers, which here in Northumberland is around the beginning of June. It might be earlier if you are in more southern climes.

We grow Russian comfrey, but be warned – this is very invasive, so unless you have a big plot, you might like to look for the Bocking 14 variety which is easier to tame. Bocking 14 is also higher in nutrient content than the wild comfrey.  See if you have a local plant swop group or find someone with a big clump who is happy to divide it for you. Once established, this is a prolific plant, so finding some shouldn’t be a problem.

 

Cut the leaves using shears and wearing gloves, about 5cm from the ground. You can be brutal, and this plant will soon grow back, allowing you to do another cutting from it later in the year.

 

There are two schools of thought when it comes to making the feed. If you are a fan of Gardener’s World, you may have seen Monty Don adding comfrey leaves to a bucket of water and letting that steep. It produces a less concentrated feed, is easy to do, but boy, does it stink! Use approximately 1kg leaves to 15 litres of water. After about 4-6 weeks this can be strained, and the leaves put on the compost heap. It can then be watered directly onto your plants.

Another method is to make a concentrate. Use a container with a hole in the bottom, or a bokashi bin. Place the leaves in the bin, chop with shears, and then press own with a weight. (we use a couple of bricks in a bucket) and allow the leaves to rot of their own accord, catching drips of this precious black liquid, which should be used sparingly. Use in a ratio of one-part feed to ten parts water.

 

 

 

Feed your crops:

• tomatoes/peppers in pots – feed 3 times a week
• tomatoes/cucumbers in greenhouse beds – feed twice a week
• indoor and outdoor pot plants/hanging baskets – feed once a week

Feed tomato plants with comfrey feed as the first fruits set

 

Other uses for Comfrey:

Composting

Place cut or bruised comfrey leaves in alternate layers throughout your compost heap. Their decomposition will encourage bacterial action causing the heap to heat up and speed up the composting process.

 

Mulch

Use as a mulch.  Chop up comfrey leaves with grass cuttings and place a 5cm layer on the surface of the soil around all plants. This will slowly rot down to provide nutrients and act as a mulch to keep in moisture and help control weeds.

 

Leaf Mould Seed Compost

Add fresh cut leaves to your leaf mould heap. Their nutrient-rich liquid will be absorbed, making it a perfect medium for growing seeds and potting compost.

 

Planting Potatoes & Beans

Fertilise the bottom of your potato and runner bean trenches with a layer of comfrey leaves. As they break down, the plant roots will access the potassium-rich fertiliser.

If you master the making of an organic feed, your plants will love you and so will the planet.

Happy gardening 🙂

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You might enjoy some of the writing and ideas in other section of this website, as we look towards leading more sustainable lives by growing our own food and creating dishes in line with seasonal eating, or head to our handy ‘Month by Month’ guides to find out what is seasonal and on topic:

• Sustainable Living
• The Bridge Cottage Kitchen
• Month by Month

Many thanks for reading.

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