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Stands tall, flowers beautifully and asks for very little ☀️
Family: Amaryllidaceae · Pot diameter: 19 cm · Height: 70 cm
Agapanthus ‘Crystal Blue’® lifts spherical flower heads in a luminous pale blue above its dense green base. A fine, deeper stripe runs along each flower segment, adding depth of colour without losing the cultivar’s fresh, airy character.
Long, arching leaves form a full evergreen clump, while upright flower stems add height without visual heaviness. It is one of those plants that brings order and rhythm to a terrace or border and remains elegant even after flowering has finished.
Its distinctive presence comes from the clear blue colour, airy flower heads and the strong architectural base of its foliage.
A subtle, deeper line runs along each segment of the pale blue flowers, keeping the colour luminous without looking flat.
Numerous individual flowers gather into rounded heads, held on sturdy stems above the lower green mound.
Dense, lance-shaped foliage forms an evergreen clump that keeps a clean outline and strong presence beyond the flowering season.
Why you will love it: it adds height, rhythm and summer blue without making the planting feel heavy or formal.
With a mature height of about 70 cm and a spread of around 50 cm, ‘Crystal Blue’ works best in the middle layer of a deep border or the back row of a shallow one. Place lower plants of about 20–35 cm in front so the flower stems remain fully visible, and use taller shrubs or grasses behind it where they will not block the sun.
Allow 50–60 cm from centre to centre: about 50 cm in groups of three or five for a more unified display, and 60 cm in a mixed border so each clump keeps a clear outline and good airflow. Measure from the centre of one plant to the centre of the next, not from the edges of the pots.
For a calm scheme, keep the palette to white, glaucous-silver foliage and muted lilac. Choose plants for full sun and free-draining soil; where watering needs differ, place them in separate irrigation zones.
Full sun encourages sturdy stems and abundant flowering. Introduce a newly purchased plant to strong sun gradually.
During active growth, water when the upper layer begins to dry, without allowing the pot to dry out completely.
Evergreen in mild conditions. Protect the pot and foliage from severe frost and prolonged cold, wet weather.
Harmful if eaten by people or pets. Do not allow the leaves or fleshy roots to be chewed.
Give it full sun in an open position, preferably sheltered from the strongest winds that can bend the flower stems. If the plant has come from a shaded nursery or shop display, increase its hours of direct sun gradually.
Plant in spring at the same depth as it was growing in its pot, in fertile soil that retains some moisture while draining excess water quickly. Avoid low-lying areas where the soil remains saturated in winter.
Use a pot with several drainage holes and a loose, peat-free multipurpose compost with improved drainage. Once the roots have genuinely filled the available space, move up by only one moderate size, about 2.5–5 cm wider.
While it is establishing and during active growth, water thoroughly when the upper layer of the compost or soil begins to dry. Always allow excess water to drain away; in a pot, do not let the entire root ball dry out completely from summer into early autumn.
‘Crystal Blue’ is listed as evergreen, so its foliage and roots need care during severe frost. In colder areas, move the pot to a bright, sheltered, frost-free position and protect it from prolonged winter rain.
In pots, feed regularly but moderately during active growth with a balanced fertiliser formulated for flowering plants, following the label instructions exactly. In the ground, fertile soil often needs fewer additional applications.
The main flowering period is in summer and may continue for longer depending on the climate and the plant’s maturity. Cut spent flower stems at the base, or leave selected seed heads for winter interest, and remove only yellow or damaged leaves.
Divide a mature, dense clump in spring only when rejuvenation or propagation is needed; division preserves the cultivar’s characteristics. Wear gloves and keep leaves and fleshy roots away from children and pets, as the plant is harmful if eaten.
‘Crystal Blue’ is not a one-season plant. Its base gradually becomes denser and, as it establishes, develops a fuller presence and may produce more flower stems.
In a border, it has room to develop into a broader, fuller clump. Once established, it remains a reliable perennial feature and begins a new cycle of growth and flowering each year.
In a pot, growth remains more controlled and the clump thickens within its boundaries. As it matures, the contrast between the compact green base and tall flower stems becomes more pronounced.
Total height including flowers · a natural clump, not a rigid geometric form
What evergreen means: the foliage remains, but the flower stems are seasonal and do not persist throughout the year.
What to expect after planting: During its first season, it may invest more energy in establishing roots than in maximum flowering. The characteristic full appearance of ‘Crystal Blue’ develops as the clump settles and matures in its position.
Although commonly called African lily in English, the genus Agapanthus does not belong to the true lily family. It belongs to Amaryllidaceae and is placed in the distinct subfamily Agapanthoideae.
What looks like one large flower from a distance is an umbel: many individual flowers arise on their stalks from a common point and form the rounded head.
Each flower has six similar perianth segments called tepals because its petals and sepals are not clearly differentiated. In ‘Crystal Blue’, their deeper central line enhances the striped appearance.
The clump expands from fleshy rhizomes, which are modified underground stems. Dividing them produces genetically identical plants, while seedlings may differ from ‘Crystal Blue’.
Useful answers about sunlight, planting, watering, flowering, winter care and Agapanthus safety.
Yes. Full sun supports more abundant flowering and sturdier stems. If the plant was previously kept in a shaded nursery or shop, increase its exposure to direct sun gradually so the foliage can acclimatise.
It suits both. In the ground it needs a sunny position that does not become waterlogged, while a pot gives you greater control over drainage and makes protection during severe frost easier. Avoid both an oversized pot and permanently congested roots.
During active growth, water when the upper layer begins to dry and continue until the entire root ball is evenly moistened and excess water drains away. Do not wait for the pot to dry out completely in summer, and do not follow a fixed number of days.
Common causes include insufficient sunlight, allowing the pot to dry out completely in summer and early autumn, excessive division, exhausted roots or inadequate winter protection. A recently divided plant may also need time before it flowers abundantly again.
In mild areas it can remain outdoors in a sheltered, free-draining position. Where severe frost occurs, protect the pot and evergreen foliage carefully or move it to a bright, frost-free place. Cold combined with saturated compost is more dangerous than cold alone.
No. Agapanthus is harmful if eaten by people, dogs or cats. Keep it out of easy reach, wear gloves when dividing or cutting the plant, and wash your hands after handling it.
