All You Need to Know About Comfrey Tea as a Natural and Effective Fertilizer for Plants


When it comes to organic fertilizers, there are many options available for gardeners. One of the most popular and useful choices is comfrey tea. Comfrey tea is made from the leaves of the comfrey plant, which is known for its high nutrient content. In fact, comfrey leaves have a higher nitrogen, phosphorous, and potassium (NPK) analysis than most commercially available fertilizers. This makes it an excellent choice for plant growth and health.

Comfrey tea is easy to make at home. Simply pack a container with wilted comfrey leaves, add water, and let it sit for a few weeks. The leaves will naturally decompose and release their nutrients into the liquid. After the steeping period, the tea can be diluted with water and used for watering plants. The liquid fertilizer can be applied directly to the soil around the base of plants or sprayed onto the leaves. The high nutrient content of comfrey tea nourishes plants and helps them resist pests and diseases.

There are many uses for comfrey tea in the garden. It can be used as a general-purpose fertilizer for all types of plants, including flowers, fruits, and vegetables. Comfrey tea can also be used to make a foliar spray, which is applied directly to the leaves of plants. This method allows nutrients to be quickly and efficiently absorbed by the plants, promoting healthy growth. Comfrey tea can also be used as a compost activator, helping to break down organic materials more quickly and efficiently. By adding a few cups of comfrey tea to your compost pile, you can speed up the decomposition process and create nutrient-rich compost.

If you’re interested in making your own comfrey tea, there are a few things to keep in mind. First, it’s important to use a cultivar called Bocking 14, which has been specially bred for its high nutrient content and low levels of toxic compounds. This cultivar is also less invasive than other varieties of comfrey, making it a better choice for home gardens. Second, it’s important to harvest comfrey leaves at the right time. Leaves should be harvested before the plant flowers, as this is when they contain the most nutrients. Finally, it’s important to follow proper dilution rates when using comfrey tea. The liquid fertilizer should be diluted to a ratio of 10 parts water to 1 part comfrey tea for most plants.

In conclusion, comfrey tea is a natural and effective fertilizer that can be easily made at home. Its high nutrient content makes it an excellent choice for promoting healthy plant growth and preventing pest and disease problems. By following a few simple steps, gardeners can make their own comfrey tea and reap the benefits of this organic fertilizer.

Using Comfrey Making Comfrey Compost Comfrey Liquid Feed or Tea

Comfrey is a flowering herb that is known for its exceptional qualities as a fertilizer. It is often referred to as the “best fertilizer on earth” because of its high nutrient content and ability to improve soil structure. Comfrey can be used in various forms to benefit your plants, whether you want to make compost, organic liquid feed, or mulch. Here are some methods to explore:

Making Comfrey Compost: To make comfrey compost, you will need comfrey leaves, which are rich in nitrogen and other essential nutrients. Comfrey leaves can be composted alone or mixed with other organic materials like kitchen scraps or garden waste. Composting comfrey leaves will break them down into a rich, dark compost that your plants will love.

Comfrey Liquid Feed or Tea: Comfrey liquid feed or tea can be made by steeping comfrey leaves in water. The nutrients from the leaves will seep into the water, creating a nutrient-rich liquid that can be used to feed your plants. To make comfrey tea, place comfrey leaves in a container, cover them with water, and let them steep for 2-3 weeks. After that, strain the liquid and dilute it with water before using it as a fertilizer.

Using Comfrey as Mulch: Comfrey leaves can also be used as mulch around your plants. Simply spread a layer of comfrey leaves on the soil surface around your plants. The leaves will slowly break down, releasing nutrients into the soil and suppressing weed growth. Comfrey mulch is particularly beneficial for fruiting plants like tomatoes, as the high potassium content promotes flowering and fruit development.

Comfrey is a versatile plant that can benefit your garden in many ways. Whether you choose to make comfrey compost, liquid feed, or use it as mulch, your plants will reap the rewards of this organic fertilizer. Just remember to handle comfrey with care as its leaves can irritate the skin. If you want to learn more about using comfrey and other organic fertilizers, there are many books and online resources available for further exploration.



2. Westhorpe, C. (n.d.). Comfrey: FAQ’s. Retrieved from

3. “Does Bocking 14 Comfrey Master the Gardeners’ Pest and Disease-free Fertiliser?” Radio Loop.

Nutritional NPK Analysis of Bocking 14 Comfrey

Comfrey is a useful plant for making organic fertilizer, especially when it comes to its nutrient content. Bocking 14 Comfrey, in particular, is known for its high nutritional value, making it a popular choice among growers and gardeners.

When it comes to the NPK analysis of Bocking 14 Comfrey, the nutrient content can vary depending on various factors such as soil conditions, weather, and cultivation practices. However, on average, Bocking 14 Comfrey is known to have a high nitrogen (N), phosphorus (P), and potassium (K) content, making it a balanced fertilizer for plants.

The NPK ratio of Bocking 14 Comfrey can be estimated to be around 2-1-5. This means that it contains approximately 2% nitrogen, 1% phosphorus, and 5% potassium. These three essential nutrients play vital roles in plant growth and development.

Nitrogen (N) is responsible for vegetative growth, promoting lush foliage and green leaves. Phosphorus (P) aids in root development, flowering, and fruiting. Potassium (K) contributes to overall plant health, disease resistance, and fruit quality.

Comfrey tea made from Bocking 14 Comfrey can be used as a liquid fertilizer for plants. To make comfrey tea, the leaves of the comfrey plant are harvested, chopped, and placed in a vessel with water. The mixture is then allowed to decompose for a certain period, typically about 2 to 3 weeks. The resulting liquid is then diluted and used to water plants.

This comfrey tea can provide plants with essential nutrients, including NPK, and also acts as a beneficial side dressing around the base of plants to promote healthy growth. It can be particularly useful for fruiting plants, as it provides the necessary nutrients for robust fruit production.

It is important to note that the NPK analysis of Bocking 14 Comfrey mentioned above is a general estimate and can vary. For more accurate information, it is recommended to have the compost tested by a professional laboratory to determine the exact nutrient levels.

In addition to its NPK content, Bocking 14 Comfrey also contains other essential plant nutrients and trace elements. It is rich in calcium, magnesium, and iron, among others, which contribute to plant health and productivity.

When using comfrey tea as a fertilizer, it is essential to follow proper application guidelines. It is best to dilute the tea with water to avoid over-fertilizing plants and causing nutrient imbalances. A dilution ratio of 1:10 or 1:15 (comfrey tea to water) is generally recommended.

Comfrey tea can be applied to plants by pouring it directly into the soil around the base of the plants, or it can be sprayed on the foliage. It is advisable to apply the tea during the growing season, around every two to three weeks, for optimal results.

Comfrey tea can also be used to make a nutrient-rich compost by mixing it with other organic materials such as kitchen scraps, grass clippings, or manure. This compost can then be used as a natural fertilizer for garden plants.

When using comfrey tea or compost, it is important to keep in mind that they are organic materials and will decompose over time. Thus, it is necessary to replenish the supply regularly to provide a steady source of nutrients for the plants.

In conclusion, Bocking 14 Comfrey is a valuable plant for making organic fertilizer due to its high NPK content. Its nutritional profile and other essential plant nutrients make it a beneficial addition to any garden or growing system. If you are a commercial grower or a home gardener looking for a natural and nutrient-rich fertilizer, comfrey tea and compost made from Bocking 14 Comfrey are worth exploring.


  1. Zarro, M. (2012). Comfrey Fertilizer: How To Make And Use Comfrey Tea. Retrieved from
  2. Master Gardener Program. (2018). Bocking 14 Comfrey. Retrieved from

If you have any questions about Bocking 14 Comfrey or would like more information, please feel free to contact us. We are here to help!

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Dr Heidi Parkes

By Dr Heidi Parkes

Senior Information Extension Officer QLD Dept of Agriculture & Fisheries.