Plant in full sun to light shade in a decently well drained soil with regular to occasional irrigation. This variety will go partially deciduous but is hardy to at around 19 degrees F and even more if mulched. As with other Agapanthus this one should tolerate near coastal conditions, frost and neglect and useful in the garden and as a cut flower.

The name Agapanthus is derived from the Greek words 'agapé', meaning "love" or "friendship" and 'anthos', meaning "flower" and it is for this reason that "Love Flower" is sometimes given as its common name, though there does not seem to be any colloquial usage of this name and the reason for naming as such remains unclear. Some have suggested that the translation could be interpreted as "lovely flower", "flower of love" or if the name originated from the word 'Agapeo' which means "to be contented with" it could just refer to a flower Charles Louis L'Héritier, who first used the name Agapanthus. A good accounting of this is presented by Wim Snoeijer in his Agapanthus: A Revision of the Genus Timber Press 2004 but essentially Carl Linnaeus (the father of modern taxonomy) in 1753 published the name Crinum africanum for a plant likely brought back to Holland from the Cape of Good Hope by the year 1679. In 1789 Charles Louis L'Héritier de Brutelle, the Director of the Jardin des Plantes in Paris, changed the name of this plant to Agapanthus but used the invalid specific epithet umbellatus instead of preserving Linnaeus species name africanus. This mistake has perpetuated naming problems within the genus ever since. In addition, the common "Lily of the Nile" is often used for this plant even though this plant originated in South Africa and not along the Nile River.

Agapanthus 'Brilliant Blue' was bred by Agapanthus hybridizer Vance Hooper of New Plymouth, New Zealand. It is considered to be a Agapanthus campanulatus var. patens F2 hybrid. Agapanthus campanulatus var. patens is a smaller deciduous agapanthus with deep blue flowers from the higher elevations (5,900 to 7,900 feet) in the Drakensberg Mountains of South Africa. It has long been used for hybridization with other species, bringing in smaller size, hardiness and a deep blue flower coloration. It was a primary parent of the well-known Headbourne Hybrids that were bred in England by Lewis Palmer in the late 1940s at Headbourne Worthy and introduced in the 1950s and 1960s. This was a new Agapanthus for us in 2014 but we like what we saw and read about it - Irish nurseryman and horticulturalist Pat Fitzgerald says of it that "Agapanthus 'Brilliant Blue' is a dwarf and very floriferous African Lily with the deepest blue flower of any variety we tested so far. It is ideal for use in patio containers or in the milder climates in perennial or mixed borders." This plant received US Plant Patent PP25,966 in September 2015 and we grew and sold it from 2014 until 2023. 

The information displayed on this page about Agapanthus 'Brilliant Blue' PP25,966 is based on the research we conducted about it in our nursery horticultural library as well as from information provided by reliable online resources. We also include some of our own observations made about this plant as it grows in the nursery gardens and other gardens that we have visited, as well how the crops have performed in the containers in our nursery field. We will also incorporate comments that we have received from others and welcome hearing from anyone with additional information about this plant, particularly if it includes cultural information that will aid others to better grow it.