This is the big one in the agapanthus world with large globular heads of white trumpet flowers on thick green stems up to 150cm tall. The thick, lush, strap like leaves can reach 60 to 90cm in length and will remain evergreen if kept frost free.
It is not as hardy as many of the numerous agapanthus cultivars but we have found it to be cold resistant enough in coastal and inner city gardens if grown in the ground and given a thick winter mulch. Often, in our southern garden, the foliage has remained pretty much evergreen during milder winters. Potted plants should be put under glass during the coldest months, if the roots freeze then it has had it.
Plant in a moist but well drained soil with full sun and plants in pots keep slightly pot bound. This will encourage less foliage and more flowers especially with a regular feeding of tomato fertiliser during the summer months.
Sent as a young plant in a 9cm or 2L pots.
Additional photo by Stokperdjie - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=17882330