Repot pot-bound agapanthus
May is a good time to divide and repot very root-bound agapanthus, even though they must have constricted and restricted roots to flower. This means that a common mistake is to give each individual plant or section too much compost and space to grow into. The result will be luxuriant foliage but a noticeable absence of flowers. However, when you repot you must allow some room for the roots to grow and take up nutrients and water. The solution is to plant three smaller plants in one pot so they are crowded but have a little room for growth. This will mean that they are likely to flower modestly in this first summer, but as they grow quickly in the fresh compost the roots will soon become restricted against the sides of the pot, stimulating vigorous flowering. Then, in about three years’ time, they will need repotting to repeat the process.