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Compact in height, generous with flowers — it feels at home everywhere 💙
Family: Amaryllidaceae · Pot diameter: 17 cm · Height: 60 cm
Agapanthus ‘Su Casa’® fills the scene with blue umbels held lightly above fine green foliage. Each head opens into many small, tubular flowers, while the numerous flower stems create successive layers of colour. Its early start and generous flowering give the compact clump a presence far more abundant than its quiet outline suggests. The result is bright, crisp and full of summer character.
Repeated along a path, it creates rhythm; on a terrace, it becomes a blue focal point among lower planting. The evergreen base keeps the composition organised through mild seasons, even without flowers. Beside white blooms or fine ornamental grasses, the rounded umbels gain a clear outline without making the space feel heavy.
‘Su Casa’® stands out by combining exceptional flowering power, an early start and a compact habit in one balanced cultivar.
It was selected primarily for its high number of flower stems, allowing the blue display to look abundant without losing the clump’s organised form.
It begins flowering early in the Agapanthus season and may continue producing new flower stems, depending on the climate and growing conditions.
Its controlled height is paired with rapid formation of a full base, giving the plant a strong presence without allowing it to dominate the composition.
Why you will love it: it delivers the effect of a large blue floral display in a form that fits easily on a refined terrace or in a mixed border.
At a mature flowering height of about 60–70 cm, ‘Su Casa’® suits the front to middle layer of a deep border or a repeating blue line along a path. In a pot, it works best on its own or as the tallest element in a lower composition, keeping its numerous flower stems fully visible.
For distinct repetitions, allow about 60 cm from centre to centre, bearing in mind that clump width can change with age and position. This leaves room for the strap-shaped foliage without compressing it between neighbouring plants.
Its blue flowers are highlighted by pure white, silver-green foliage and fine glaucous textures. Keep the composition in a sunny, free-draining position and place more drought-tolerant plants at the drier edge of the irrigation zone.
Full sun encourages maximum flowering. It tolerates light partial shade, but may produce fewer flower stems.
During active growth, water when the upper layer begins to dry. Excess water must drain away quickly and never remain around the roots.
Evergreen in mild conditions. Protect the foliage and roots from severe frost, cold winds and prolonged cold, wet weather.
Not edible. Ingestion may irritate the mouth, while the plant sap may irritate the skin and eyes.
Give it an open position in full sun so it maintains a compact habit and makes the most of its high flowering capacity. If the plant previously stood in a sheltered or shaded position, increase its hours of direct sun gradually to prevent foliage scorch.
Plant at the same depth as before, with the crown level with the soil surface. Choose fertile soil that retains useful moisture during active growth but does not remain waterlogged, especially in winter.
Use a pot with unobstructed drainage holes and a stable, airy growing mix. Do not move it straight into an excessively large pot; once the roots have genuinely filled the available space, increase by only one moderate pot size.
After planting, water thoroughly whenever the upper layer begins to dry until the roots are established. Check the mix more frequently in hot weather; in the ground, an established plant mainly needs support during prolonged dry spells. Reduce watering noticeably in winter without allowing the evergreen foliage to become dehydrated.
From the start of new growth until early autumn, provide balanced nutrition according to the plant’s needs and the soil’s fertility. Regular, controlled feeding matters more in pots because the mix’s nutrient reserves are depleted more quickly. Avoid excessive nitrogen, which may favour foliage at the expense of flowers.
‘Su Casa’® is evergreen and needs a sheltered, free-draining position when severe frosts are expected. Remove flower stems once they finish, but retain the green leaves. Divide only when the clump needs it, preferably in spring, knowing that recent division can temporarily reduce flowering. Wear gloves and wash your hands after handling.
‘Su Casa’® was selected for its ability to flower very early and produce numerous flower stems. This is a genetic trait of the cultivar, not a guarantee of the same number of flowers in every season or immediately after repotting.
Once established, the base thickens into a full evergreen clump. Its total flowering height remains about 60–70 cm, while the actual number of flower stems depends on sunlight, age and the conditions of the season.
Its rapid formation of a full base is particularly noticeable in a pot. When the roots use the available space without becoming depleted, the contrast between the lower foliage and the numerous blue flower stems becomes the plant’s defining decorative feature.
Fleshy, strap-shaped blades emerge from the base, while upright flower stems lift the blue umbels above the foliage. Mature flowering height is about 60–70 cm, with an indicative clump spread of 60 cm.
Flowering may begin in May and continue into August or September. The evergreen base remains in mild conditions; winter protection is needed in areas with frost.
What to expect after planting: The cultivar was selected for early performance, but every newly planted specimen first needs to balance its root system. Do not judge its full potential from a single flowering season; the characteristic full display settles in as the clump establishes.
In 2019, at Aalter in Belgium, Tim Wyckstandt noticed an Agapanthus that flowered just a few months after sowing. It became his first own selection at Agapanthuskwekerij, among more than 20,000 seedlings. Further observation revealed its numerous flower stems, continuing flowering and rapid formation of a full base.
The selection received the code ‘19005’ and entered the market in 2023 as Agapanthus ‘Su Casa’®, distributed internationally by Van Vliet New Plants alongside the white ‘Mi Casa’. Early flowering remains the characteristic that connects that first plant with its appearance today.
In ‘Su Casa’®, one new leaf shoot can be accompanied by two to three flower stems. Producing numerous stems from a compact base explains the high ratio of umbels to foliage.
The spherical Agapanthus head is an umbel. Each small tubular flower has its own stalk, and these stalks converge at the top of the same flower stem. This radial arrangement gives the head its rounded volume.
Useful answers about early flowering, sun, pots, winter and the safety of ‘Su Casa’®.
This cultivar is considered very early for an Agapanthus. Flowering may begin in May and continue into August or September, although the exact start and duration vary with the local climate, sunlight and the plant’s establishment.
To make the most of its high flowering capacity, choose full sun. It can grow in light partial shade, but will usually produce fewer or weaker flower stems. Acclimatise a plant that previously grew in shade gradually.
It suits both. Its compact habit and rapid formation of a full base make it a particularly strong choice for pots, while in the ground it works beautifully in groups or repetitions, provided the position is sunny and free draining.
Common causes include insufficient sun, complete drying during active growth, an excessively large pot, recent division or inadequate winter protection. A newly repotted plant may also invest in root establishment first.
‘Su Casa’® is evergreen, so it retains foliage in mild conditions. Severe frost, cold winds or prolonged winter wet can cause damage, so a potted plant needs a sheltered position when conditions become extreme.
It is not intended for consumption, and leaves or roots should not be chewed. Ingestion may irritate the mouth, while the sap may irritate skin and eyes. Keep it out of easy reach and wear gloves when dividing the clump.
