John Innes Compost: A Guide for Container Gardening
What is John Innes Compost?
John Innes compost is a type of potting mix that is ideal for long-term plant growth in containers. It is named after the John Innes Horticultural Research Institute, where it was first developed in the 1930s.
How Does John Innes Compost Differ from Other Composts?
John Innes compost is heavier than other types of potting compost because it contains loam, or soil. Loam provides a steady supply of nutrients and water, and it has good drainage and aeration. This makes John Innes compost ideal for plants that will be growing in containers for more than one season.
What are the Different Types of John Innes Composts?
There are three main types of John Innes potting compost:
- John Innes No. 1: Contains a low level of fertilizer and is used for potting on young seedlings or rooted cuttings.
- John Innes No. 2: Contains a moderate level of fertilizer and is used for potting on plants at the next stage of growth.
- John Innes No. 3: Contains the highest level of fertilizer and is used for mature plants growing in containers.
There is also an ericaceous compost, which is lime-free and suitable for acid-loving plants.
Are John Innes Composts Peat Free?
Traditionally, John Innes composts have been made with peat. However, there are now some peat-free options available. Peat-free John Innes compost is better for the environment because peat extraction damages peat bogs and contributes to climate change.
Advice on Buying John Innes Composts
When buying John Innes compost, it is important to choose a high-quality product. Look for composts that are made by members of the John Innes Manufacturers’ Association. These composts will meet certain quality standards.
Where to Buy Peat-Free John Innes Composts
Peat-free John Innes composts can be harder to find than traditional peat-based composts. However, they are worth seeking out because they are better for the environment. You can find peat-free John Innes compost at some garden centers and online retailers.
