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Rhizomatous perennial with fleshy roots
Amaryllidaceae
Purple-blue tender perennial for containers and borders
Van Noort
Blue Triumphator lily of the Nile (Agapanthus ‘Blue Triumphator’)
Blue Triumphator is a striking lily of the Nile that raises large purple-blue umbels above a clump of green, strap-like foliage. Stems reach approximately 100 cm (40 in), while the clump spreads 50 cm (20 in). This Van Noort No1 root is planted in spring in sun and fertile, freely draining soil. Bloom from July through September adds vertical structure to large containers, contemporary borders, and bouquets. Because the cultivar is hardy only near Zone 7, the pot or intact root ball must be stored frost-free through winter across most Canadian regions. Pollinators use the tubular blooms, and cut stems lend height to formal summer arrangements.
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Discover the plant
Common nameBlue Triumphator lily of the Nile
FamilyAmaryllidaceae
GenusAgapanthus
CultivarBlue Triumphator
TypeRhizomatous perennial with fleshy roots
Botanical nameAgapanthus
Reproducible seedsYes
Blue Triumphator lily of the Nile (Agapanthus ‘Blue Triumphator’) forms a clump of dark-green, strap-like, arching leaves from which strong, tall stems emerge. Every stem carries a large rounded umbel composed of numerous purple-blue to blue-violet trumpet flowers. Bloom develops from July through September and creates a clean architectural presence in borders or containers. The plant reaches approximately 100 cm (40 in) high and 50 cm (20 in) wide. Hardy around Zones 7 to 10, it requires frost-free winter protection across most Canadian regions. Mature clumps become increasingly impressive while remaining orderly at the base.
Plant the No1 root in spring once soil has warmed and frost danger has passed. Choose full sun for maximum flowering stems, or light partial shade in very hot sites. Fertile, loose, freely draining soil is essential. Set the crown according to the 10 cm (4 in) depth specified for this format, spread the roots, and water deeply. Maintain consistent moisture during growth, feed moderately in spring, and avoid excess nitrogen. In a container, allow the clump to remain slightly crowded because a well-filled root ball often promotes flowering. Shelter developing stems from severe wind and remove standing water promptly.
Blue Triumphator creates a blue focal point in a large pot, contemporary border, temporary Mediterranean garden, or cut-flower bed. Pair its umbels with white dahlias, dark cannas, salvias, grasses, and silver foliage. Flowers attract bees, butterflies, and hummingbirds, while cut stems produce dramatic arrangements. Remove faded umbels but retain foliage until it matures. Before severe freezing, move the container into a cool, bright room or lift the clump with its root ball. Every part is ornamental, not edible, and toxic to pets if swallowed. Keep stored roots and pruned material safely beyond their reach.
In the garden
- Exposure
- Full sun to partial shade
- Life cycle
- Tender perennial grown as an annual or overwintered frost-free in Quebec
- Hardiness
- Zones 7 to 10; overwinter frost-free in colder regions
Planting guide
Sowing & germination
Planting depth
Crown approximately 10 cm (4 in) deep for the supplied root format
Spacing / density
45 to 50 cm (18 to 20 in) between plants
Establishment temperature
20 to 22°C (68 to 72°F)
Best planting time
Late May to June in Quebec, once soil has warmed
Propagation
Division of mature clumps in spring
Growing method
In spring, unpack the No1 root promptly and moisten it lightly if it appears dry. Wait until soil reaches approximately 12°C and nights remain above 10°C before outdoor planting. Choose full sun with shelter from severe wind and prepare ground to 35 cm (14 in) deep. Incorporate mature compost and fine gravel if drainage is slow. Dig broadly enough to spread fleshy roots without bending them. Set the crown according to the product’s approximately 10 cm (4 in) planting depth, refill, and allow 45 to 50 cm (18 to 20 in) between mature plants. Water deeply to remove air pockets. Maintain consistent moisture during establishment without saturating the soil. A thin mulch suppresses weeds, but keep the crown exposed. Once leaves develop, apply balanced fertilizer at low strength. Protect new shoots from slugs and install discreet support only in windy sites. Remove faded umbels, then reduce watering after bloom. Before hard frost, lift the entire root ball or move the container indoors. Keep the plant cool, in moderate light, with minimal water, then resume care gradually in spring. Inspect the stored clump monthly for pests, rot, and excessive dryness before the next outdoor season begins.
Soil and care
Soil & care
Soil pH
6.0 to 7.0
Minimum temperature
Protect below approximately -15°C; overwinter frost-free in Quebec
Care level
Moderate
Watering
Water deeply after planting and keep soil evenly moist during establishment. Through active growth, irrigate when the upper 3 to 5 cm (1 to 2 in) is dry. Reduce moisture after flowering and during cool winter storage. Never leave the root ball standing in a saucer because fleshy roots rot in saturated conditions. Stable moisture supports even stem elongation. Check containers more often during hot, windy weather.
Soil type
Fertile, loose, freely draining soil supports fleshy roots and flowering stems. Loam enriched with mature compost is suitable provided water never collects around the crown. In heavy soil, plant on a mound or use a container. Avoid excessively nitrogen-rich amendments, which mainly stimulate foliage rather than balanced flowering. An airy structure also supports clean winter storage in containers. Renew compacted surface mix so irrigation remains even around the entire root ball.
Fertilization
In spring, add mature compost and balanced slow-release fertilizer as growth resumes. In containers, supplement with half-strength flowering-plant fertilizer every three weeks until buds open. Stop feeding afterward so tissues mature properly. Excess nitrogen produces abundant leaves but few flowering stems and may leave growth soft before storage. Judge leaf colour and stem strength before adding any extra feed. Flush container mix occasionally to prevent fertilizer salts from accumulating around roots.
Moisture
Average moisture during growth; keep the mix drier, without becoming completely desiccated, during cool overwintering.
Seasonal care
In spring, bring the container gradually out of storage as days lengthen. Remove dry leaves, check drainage, and replace the upper few centimetres of mix with mature compost. Resume watering in small amounts, increasing it as active growth develops. Divide only a severely crowded clump that flowers less because agapanthus often produces more stems when roots occupy the available space. Wait for nights above 10°C before hardening the plant outdoors. During summer, place it in sun, water deeply when the surface dries, and feed at half strength until buds form. Rotate the pot, support wind-exposed stems, and watch for slugs, scale, and spider mites. Harvest umbels or remove them after flowering to prevent unnecessary seed production. Retain every green leaf. In fall, stop feeding, reduce moisture, and move the plant inside before hard frost. Clean debris, inspect visible roots, and isolate infested specimens. Through winter, keep the root ball near 5 to 10°C in a bright or moderately lit room depending on foliage condition. Water only enough to prevent complete desiccation and never leave water in the saucer. Check monthly for rot, scale, and adequate airflow. A cool, frost-free rest supports the next growth cycle. Do not place the pot beside a heat source, which interrupts rest and encourages weak growth. Label divisions clearly and record flowering performance before deciding which clumps need repotting in spring.
Container growing
Container growing
Recommended pot size
35 to 45 cm (14 to 18 in) wide and at least 35 cm (14 in) deep
Choose a heavy container 35 to 45 cm (14 to 18 in) wide and at least 35 cm (14 in) deep for one No1 root. Several drainage holes are essential; raise the pot and never use a saucer holding water. Blend two parts quality potting mix, one part mature compost, and one part perlite or pumice. Arrange fleshy roots without bending them and respect the approximately 10 cm (4 in) planting depth. Water to settle the mix, then position in sun. During growth, check moisture several times weekly and irrigate when the upper 3 cm (1 in) is dry. Feed at half strength every three weeks until flowers open. Rotate the pot to balance stems and shelter it from gusts. Blue Triumphator prefers slight crowding; repot only when roots distort the container or water no longer penetrates. After bloom, remove umbels and retain foliage. Before frost, wash the pot exterior, inspect for pests, and move it into a bright space near 5 to 10°C. Reduce water sharply without allowing complete desiccation. In spring, replace surface mix, resume watering gradually, and harden foliage for seven to ten days before full outdoor sun. Keep the overwintering room ventilated and avoid sudden temperature swings. Record the pot’s best summer exposure so it can return to the same productive position.
Bloom and dimensions
Size, flowering & harvest
Mature height
100 cm (40 in)
Width / spread
50 cm (20 in)
Flower color
Purple-blue to blue-violet
Foliage color
Medium to dark green
Foliage type
Strap-like, arching, and semi-evergreen depending on storage conditions
Growth rate
Moderate
Growth habit
Upright, clump-forming, and architectural
Fragrance
Flowers without a notable fragrance
Bloom period
From July through September, strong stems carry large spherical umbels filled with purple-blue trumpet flowers. Full sun, a slightly crowded root ball, and moderate feeding encourage bud formation. Cut a stem when several flowers have opened for an arrangement, or remove the faded umbel at its base without damaging leaves that rebuild stored energy. Removing individual damaged florets keeps each umbel attractive while later buds continue opening.
Fruiting
After pollination, selected flowers may form dry capsules filled with dark seed. This fruiting can be decorative, but it consumes energy and seedlings do not reproduce the Blue Triumphator cultivar reliably. To support root reserves and the following bloom, remove faded umbels before maturation in most cases. Retain a few capsules only for their graphic outline, never for consumption, then cut them before moving the container into winter storage.
Harvest
Cut stems when several flowers are open for arrangements; remove faded umbels and move the root ball indoors before hard frost.
Garden associations
Companion plants & uses
Companion plants
Pair Blue Triumphator with white dahlias, burgundy cannas, blue salvias, verbenas, fountain grasses, silver lamb’s ears, and container geraniums. These plants share a preference for sun and effective drainage, while their colours emphasize the purple-blue umbels. Keep the base accessible for watering and moving the container indoors. Avoid bog plants or vigorous groundcovers that keep the crown damp and complicate fall handling. Pale coneflowers and gaura add airy flowers at a compatible height without competing with the large spheres. Choose restrained companions that leave enough light and room for the agapanthus leaves to arch naturally.
Garden use
Use Blue Triumphator as a vertical focal point in a large container, near the centre of a border, or repeated along a patio. Purple-blue umbels suit contemporary gardens, temporary Mediterranean schemes, and pollinator plantings. The stems are remarkable in arrangements. Container culture is especially practical in Canada because the plant can be moved into sun and then overwintered frost-free without disturbing its fleshy roots. The outline remains clean among softer or trailing foliage. Dried umbels can be retained for short-term structure when seeds and unwanted seedlings are not a concern.
Frequently asked questions
Frequently asked questions
Why does my agapanthus produce leaves but no flowers?
Insufficient sun, excess nitrogen, recent division, or overly warm winter storage can delay flowering stems. Provide at least six hours of direct light, use balanced fertilizer rather than a foliage formula, and let the clump remain slightly crowded in its pot. After division, the plant may spend one season rebuilding roots. During winter, keep it cool near 5 to 10°C with very little water. In spring, resume irrigation gradually and wait for nights above 10°C before outdoor placement. Do not repot annually because an oversized container often promotes roots and leaves before flowers. Also preserve every healthy leaf after bloom so stored energy can return to the crown.
How should Blue Triumphator be overwintered in Canada?
Move the container indoors before hard frost after inspecting foliage and washing the pot exterior. Place it in a bright garage, cool sunroom, or unheated room near 5 to 10°C. Reduce watering sharply: moisten only when mix is dry several centimetres deep and never leave water in the saucer. Stop all feeding until spring. Remove yellow leaves and watch for scale, spider mites, and rot. If the plant grew in the ground, lift the entire root ball rather than cleaning roots bare. In March or April, increase light and water gradually, then harden it outdoors once nights become reliably mild. Keep it separate from houseplants until pest inspections remain clear.
Does Blue Triumphator prefer being crowded in its pot?
Yes, a well-filled root ball often encourages flowering, but the plant should not become so crowded that water cannot penetrate or the container deforms. Begin with a 35 to 45 cm (14 to 18 in) pot for one No1 root. Replace surface mix every spring and repot only when roots fully occupy the volume, usually after two or three years. Move into a container only slightly larger rather than an enormous tub. Use spring repotting to remove dead roots. If dividing, retain substantial sections and expect flowering to be reduced during the recovery season. Never cut healthy fleshy roots merely to force them back into the old pot.
When should umbels be cut for a bouquet?
Cut a stem when several flowers are open but many buds still show colour and remain firm. Work in the morning with a clean tool and cut above the foliage without removing basal leaves. Place the stem immediately in water, recut the end diagonally, and use a heavy vase capable of supporting the umbel. Change water every two days and remove individual faded flowers. Avoid direct sun, heat sources, and ripening fruit. In the garden, also remove finished umbels when seed is not wanted; this keeps a tidy outline and lets stored energy return to the roots. Wear gloves if the sap irritates your skin.
Is Blue Triumphator safe around pets?
No. Agapanthus contains irritating compounds and should be treated as toxic to dogs, cats, and other animals that chew it. Fleshy roots present a significant concern, while leaves and flowers are also not edible. Position the container away from play areas, collect pruned leaves, and keep overwintered divisions in a closed space. If an animal consumes the plant and develops drooling, vomiting, diarrhea, abdominal discomfort, or mouth irritation, contact a veterinarian promptly and provide the name Agapanthus ‘Blue Triumphator’. Do not induce vomiting or provide home remedies without professional direction. Gloves are sensible for gardeners whose skin reacts to sap.
Wildlife and pets
Wildlife & precautions
Reported toxicity
Yes
Supporting wildlife
The many tubular flowers in each umbel provide summer nectar for bees, butterflies, and hummingbirds. Their height makes blooms visible above surrounding foliage. To retain this value, avoid insecticides during flowering, leave several stems in the garden, and combine the plant with accessible flowers blooming before and after Blue Triumphator. through the season
Outils
Compostage et écologie
