The easiest way to make the plant food is just pick a load of the leaves (stems too) and put them in a container full of water. Leave this for about 10 days before removing the leaves and stems and that’s it. Then, you have your own potassium rich plant food for hardly any effort or time.
However, one big warning to bear in mind – it does have quite a potent smell. Therefore, you probably want to keep it towards the back of your garden.
The good news is that, for just a little more time and effort, there’s a way of making comfrey food that doesn’t smell as much. So, here’s what you’ll need and how to do it…
- A length of drainpipe approx. 45cm long
- A fencepost to fix it to
- Alternatively, a length of wood about 1.3m long to act as a stake
- Screws to fix the drainpipe to the post/stake
- Funnel, ideally one with a built-in filter at the base
- Empty container, 5L plastic water container
First, if using a stake bash that into the ground first.
Then, attach the drainpipe to the fencepost or the stake using the screws, leaving just enough room to fit the funnel and water container under the bottom of the drainpipe.
Place the end of the funnel into the empty container and position under the bottom of the drainpipe.
Next, fill the drainpipe with comfrey leaves and stalks, firming them in tightly.
You might have to cup one hand under the bottom of the drainpipe whilst doing this in order to stop the leaves falling out.
The next stage is to simply let nature take its course.
The leaves will naturally start to decompose creating a concentrated liquid that drips into the container. The joy of this method is that because air can get into the drainpipe, it won’t smell.
Store the liquid in a cool, dry place such as a garage, out of direct sunlight.
When you come to use it, dilute it using one part comfrey liquid to 15 parts water. Then, you can continue to make and store this free plant food all summer long until the plant naturally dies down in the autumn.