To give the best flowers, feed border plants in spring with a balanced fertiliser, a granular feed is a good idea for slow release of nutrients. For container plants, start feeding every 2 weeks in April until flowers bloom with a liquid feed – like a tomato feed.
Keep the plants looking their best by deadheading when the flowers fade. Cut the flowers at the base, unless you want to keep the seedheads on the plant for interest later in the year.
Tidy the foliage of deciduous types in autumn, removing any dead, diseased, or damaged foliage. On the other hand, any dead foliage can be removed from evergreen varieties at any time of year.
From November to April, protect your agapanthus from cold weather with horticultural fleece. In colder areas, container grown evergreen types can be moved into a greenhouse or coldframe for extra protection. If the plants are grown in the border, mulching them in winter will help them to survive the winter season.