Agapanthus are great showy, garden flowers with tall stems and exotic looking flowers in striking blue, mauve, white and pink. Agapanthus are perennials, some are evergreen others deciduous. Growing Agapanthus is not difficult, getting them to flower is more tricky. The ideal growing conditions are full sun with fertile, moist but well-drained soil.
Agapanthus are rated amber wheelbarrow as medium difficulty to grow. It is important to select the correct variety for your garden and then to plant in the right place in your garden. Some varieties of Agapanthus will tolerate more cold and frost than others. It can take a little time to get Agapanthus to flower, although once established Agapanthus will flower for some years with no real attention. Whichever variety you select, it can take a couple of years to get them established and to flower.
Like so many of our garden favourites, when growing Agapanthus, the trick is to get the right plant in the right place and this is very much the case with Agapanthus. There are about 10 species of Agapanthus both deciduous and evergreen, but Agapanthus vary in hardiness. As a rule of thumb, the deciduous varieties are more hardy than the evergreen varieties, and the less hardy types will need a winter mulch and frost protection.
When growing Agapanthus outside, if your garden is not sheltered, you will need to select a fully hardy variety, such as A. Blue giant, A. Midnight blue, A. Lilliput (as you may expect a short variety up to 10cms) A. Snowy Owl with white flowers. Check when you buy, the label or website will state if the variety is fully frost hardy. Selecting a hardy variety is essential unless your garden is sheltered and for an explanation of what is meant by hardy follow this link
If your garden is exposed, wet, and/or prone to frost, or you wish to grow a more tender variety, Agapanthus are best grown in pots so they can be moved into a unheated conservatory or greenhouse for the winter. In colder areas Agapanthus will need shelter and winter protection.
If you live in Cornwall, or the Scilly Isles you are lucky, and can ignore this advice as Agapanthus grow abundantly, flowering freely in the milder conditions.