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Ornamental bulb
Amaryllidaceae
Fall bulbs · Ornamental alliums
Star of Persia
Allium cristophii
Product code : 146-130-01
Star of Persia (Allium cristophii), also sold as Allium Christophii, produces one of the most graphic flower heads among fall-planted bulbs. This package contains five size 14/16 bulbs. On sturdy stems about 35 cm tall, dozens of amethyst-purple starry florets form airy globes reaching 20 cm across. Hardy in Zones 4 to 10 according to Van Noort, it prefers full sun and perfectly drained soil. Flowers feed pollinators, cut well for bouquets and later become broad golden heads ideal for dried arrangements. The plant suits borders, rock gardens, gravel gardens and containers. Its low, strong stems make the oversized heads easy to admire near the front of a planting.
- Quantity
- 5 bulbs
- Exposure
- Full sun; very bright partial shade tolerated according to Van Noort
- Life cycle
- Naturalizing bulbous perennial
- Hardiness
- Zones 4 to 10 according to Van Noort
Discover the plant
Common nameStar of Persia; Persian star allium
FamilyAmaryllidaceae
GenusAllium
Speciescristophii
TypeOrnamental bulb
Botanical nameAllium cristophii
Reproducible seedsYes
Heirloom varietyYes
Star of Persia (Allium cristophii), often sold as Allium Christophii, transforms late spring with remarkably broad, airy globes. This Van Noort package contains five size 14/16 bulbs. Each bulb produces a sturdy stem about 35 cm (14 in) tall, topped by a flower head reaching up to 20 cm (8 in) across. Dozens of amethyst-purple starry florets with a metallic sheen create an almost cosmic structure. Slightly glaucous, strap-shaped foliage often begins declining as flowers open. Hardy in Zones 4 to 10, this naturalizing species returns reliably in drained soil and later produces golden seed heads that remain decorative for months.
Plant all five bulbs in fall, pointed end up, 10 cm (4 in) deep and 10 cm (4 in) apart. Choose full sun and fertile, loose, perfectly drained soil. Water after planting to settle the ground, then allow autumn rainfall to provide most moisture. In spring, maintain moderate moisture through active growth without saturating the bulbs. A thin layer of compost or a small amount of balanced fertilizer is sufficient. In heavy clay, incorporate grit or grow the bulbs in a container. After flowering, retain every leaf until it yellows completely and reduce irrigation through summer dormancy.
Arrange Christophii in groups of five or more near the front of a border, in rock or gravel gardens, pollinator beds or a large container. Metallic violet globes combine with catmint, salvias, lavender, peonies, yarrow and grasses. Nectar-rich flowers attract bees and butterflies, while the allium scent generally discourages deer and rabbits. Cut stems when several stars are open for fresh bouquets or leave heads to dry in place. Their golden silhouettes remain spectacular long after bloom and suit dried arrangements. Divide offsets only when groups become crowded or flower less freely.
Planting guide
Plant well.Grow beautifully.
Planting depth
10 cm (4 in)
Spacing / density
10 cm (4 in) between bulbs according to Van Noort; group all five bulbs
Best planting time
Fall, before the ground freezes solid
Propagation
Sow ripe seed or sow in spring; separate offsets after flowering
Growing method
In fall, choose a position in full sun and loosen the soil to at least 20 to 25 cm. Drainage is the priority: incorporate fine grit into heavy ground or create a slight mound so winter water never stands around the bulbs. Set all five bulbs pointed end up 10 cm (4 in) deep and 10 cm (4 in) apart in an irregular group rather than a row. Backfill, firm gently and water deeply once. Autumn rainfall is generally sufficient afterward. In spring, maintain moderate moisture during emergence and flower-head formation, but allow the surface to dry between waterings. Spread a thin layer of compost or a small amount of balanced fertilizer at the beginning of growth. Avoid excess nitrogen, which produces abundant leaves at the expense of flowers. After bloom, leave heads to dry in place for their graphic value or remove them before seeds mature. Retain every leaf until it yellows completely so bulbs rebuild their reserves. Then sharply reduce watering through summer dormancy. Leave groups in place for several years and separate offsets only when flowering declines or bulbs become crowded. Mark the planting position before winter so emerging shoots are not disturbed during early spring cleanup or later cultivation.
Soil and care
The right care,at the right time.
Soil pH
Acidic, neutral or alkaline when drainage is excellent
Care level
Easy
Drought tolerance
Yes
Watering
Water deeply once after fall planting, then allow normal rainfall to take over. In spring, keep the soil moderately moist through emergence and flower-head development, irrigating only when the upper layer begins to dry. Never saturate the bulbs, and empty saucers promptly. As foliage yellows, gradually reduce watering. During summer dormancy, Christophii prefers relatively dry soil; constant moisture increases the risk of rot and can compromise the following season’s bloom. In exposed containers, inspect moisture more often during warm, windy weather, but always allow excess water to escape freely.
Soil type
Choose fertile, loose and perfectly drained soil. Sandy loam or gravelly ground amended with modest compost works very well. The plant tolerates acidic, neutral or alkaline conditions when the structure remains aerated. In heavy clay, incorporate horticultural grit, raise the planting area or use a container. Avoid fresh manure, compacted soil and hollows where water gathers in winter. The bulbs flower best when left undisturbed in ground that dries relatively well during summer. A gravel mulch can keep the crown area open without retaining unnecessary moisture against the bulbs.
Fertilization
In early spring, spread a thin layer of mature compost or a small amount of balanced slow-release granular fertilizer. Work it gently into the surface without damaging shoots or concentrating product around the bulb. One application is generally sufficient in fertile soil. Avoid high-nitrogen formulas that promote abundant foliage at the expense of flower heads. In containers, use half the recommended rate and stop feeding as soon as the leaves begin to yellow.
Moisture
Moderate moisture during growth; drier soil during dormancy
Seasonal care
In fall, plant the bulbs after the soil cools but before it freezes solid, then water deeply once. Mark their location so later garden work does not disturb them. In winter, avoid dense mulch that traps moisture; instead, make sure melting snow drains rapidly. In spring, gently remove debris, spread a thin layer of compost and water only when the surface begins to dry. Watch for slugs around emerging shoots and signs of allium leaf miner or downy mildew, especially in wet weather. Short stems are naturally sturdy and usually need no staking. During bloom, take a few stems for bouquets without removing every flower needed by pollinators. After flowering, let the broad heads mature and turn golden for extended interest, or remove them before seed develops if you want to direct energy toward the bulbs. Never cut green foliage. Wait until it yellows completely, then greatly reduce summer irrigation. Every three to five years, if groups become crowded or flower less, lift bulbs after foliage has dried, discard soft specimens, detach healthy offsets and keep them dry until fall replanting. Clean tools before moving to another allium bed. Inspect containers after heavy rain, clear blocked drainage holes and replace any compact surface layer. Mark self-sown groups so young seedlings are recognized the following spring. Record weak-flowering positions before dormancy, because they become difficult to locate after foliage disappears. If drainage has deteriorated, improve the bed during replanting instead of returning bulbs to the same wet pocket. Protect the broad dry heads from rough handling if you want them to remain decorative through summer.
Container growing
A garden,within reach.
Recommended pot size
Container at least 30 cm (12 in) wide and 30 cm (12 in) deep for five bulbs
Christophii performs very well in containers because of its compact stems, but drainage must be flawless. For all five bulbs, choose a stable pot at least 30 cm (12 in) wide and deep with several unobstructed holes. Fill it with lightweight potting mix blended with mature compost and horticultural grit or perlite. Set bulbs pointed end up 10 cm (4 in) deep and space them so they do not touch. Water after planting, then keep the mixture only lightly moist and never saturated. Place the container in full sun to encourage sturdy stems and intense metallic colour. In cold regions, protect the sides from repeated freezing and thawing by insulating the pot, moving it to a sheltered place or temporarily sinking it into the ground. Resume moderate watering in spring and apply half-strength balanced fertilizer. After bloom, retain foliage until it yellows and gradually reduce water. Always empty the saucer after rain and keep the substrate relatively dry through summer dormancy. Leave golden heads in place or cut them for indoor use. Divide and repot offsets when the container becomes crowded. Mark bulb positions after foliage disappears so seasonal companion planting does not damage them. Inspect drainage after heavy rain, remove any compacted surface crust and renew part of the potting mix before fall replanting.
Bloom and dimensions
Its place,in your garden.
Mature height
35 cm (14 in) according to Van Noort
Width / spread
20 to 30 cm (8 to 12 in), including the large flower head
Flower color
Amethyst purple to rosy violet with a metallic sheen
Foliage color
Slightly glaucous green
Foliage type
Deciduous, basal, strap-shaped and slightly glaucous
Growth rate
Moderate; reaches flowering size in about 1 to 2 years
Growth habit
Upright, compact and architectural
Fragrance
Light fragrance; garlic-scented foliage when bruised
Bloom period
Flowering occurs from late spring into early summer. Each sturdy 35 cm (14 in) stem carries an open head reaching 20 cm (8 in) across. Dozens of amethyst-purple to rosy-violet starry florets have a metallic sheen that glimmers in sunlight. The display resembles a spherical firework and attracts bees and butterflies. After pollination, the stars become capsules and the head dries into a remarkable golden structure that keeps its shape for several months. Cool spring weather may extend the display, while unusual heat can shorten it; nearby perennials maintain colour afterward.
Fruiting
After flowering, every starry floret produces a small dry capsule containing black seeds. This fruiting stage is not intended for food, but the entire head becomes a broad golden structure with strong architectural value. Leave it standing to extend border interest or harvest it for dried arrangements. To limit self-sowing and direct more energy toward the bulb, remove the head before full maturity while retaining green leaves until they yellow naturally.
Garden associations
In goodcompany.
Companion plants
Pair Christophii with catmint, salvias, lavender, hardy geraniums, peonies, yarrow, sedums, artemisia and small grasses. Their foliage gradually hides the allium leaves as they yellow, while their softer forms contrast with the starry globes. White, pale pink, soft yellow, blue and silver intensify the metallic violet colour. Choose companions that enjoy sun and drainage. Avoid plants requiring heavy irrigation while the bulbs are dormant in summer. Taller alliums can extend the theme, but leave enough open space around Christophii’s broad globes. Their contrasting textures keep the display balanced.
Frequently asked questions
Your questions,answered.
When and how should Christophii bulbs be planted?
Plant Christophii in fall after the soil cools, ideally four to six weeks before it freezes solid. Choose full sun and loosen perfectly drained soil. Set every bulb pointed end up 10 cm (4 in) deep and 10 cm (4 in) from the next. Arrange all five bulbs in an irregular pocket rather than a straight row so their broad heads create a natural effect. Water deeply once to settle the ground, then allow normal rainfall to provide most moisture. In heavy clay, add grit, create a mound or use a container to prevent stagnant winter moisture. Label the location before winter so emerging shoots are not disturbed during early spring cleanup.
How large do Christophii flower heads become?
According to Van Noort, stems reach about 35 cm (14 in), while the flower heads may measure up to 20 cm (8 in) across. This unusual proportion makes large amethyst-purple fireworks appear to rest near the ground. Short stems generally remain sturdy, especially in full sun. Plant all five bulbs together near the front of a border to examine every star closely without hiding taller perennials. After bloom, the head retains nearly all its breadth as it dries and turns golden. It can remain standing through summer or be cut for a lasting dried arrangement.
Can Christophii be grown in a container in Canada?
Yes. Use a freely draining container at least 30 cm (12 in) wide and deep for all five bulbs. Plant them 10 cm (4 in) deep in lightweight potting mix blended with compost and fine grit. Place the pot in full sun, water moderately during active growth and never leave water in the saucer. In cold Canadian regions, protect the sides from repeated freezing and thawing by insulating the container, moving it to a sheltered place or temporarily sinking it into the ground. After bloom, let foliage yellow and keep the mix relatively dry through summer dormancy. Mark bulb positions after foliage disappears so they are not damaged when seasonal plants are replaced.
Should the dried Christophii heads be kept?
Yes, if you enjoy their graphic value. After flowering, starry florets become capsules and the head dries into a broad golden sphere that remains decorative for months. Leave it in the garden for structure or cut it on a dry day for a lasting bouquet. Remove it before full maturity only if you want to limit self-sowing or direct more energy toward the bulb. In every case, never cut leaves that are still green. They must yellow completely to rebuild reserves needed for the next bloom. Gradually reduce watering during this stage. This patience keeps the bulbs vigorous. It also supports reliable flowering.
Does Christophii attract pollinators and resist deer?
Yes. Every broad head contains dozens of nectar-rich florets accessible to honeybees, bumblebees, native bees and butterflies. Late-spring flowering provides a useful resource between many early bulbs and summer perennials. Group all five bulbs and avoid insecticides to maximize this benefit. Deer and rabbits generally avoid the foliage and bulbs because of their allium scent, although no plant is completely protected when food is scarce. Continue observing emerging shoots and use temporary protection if animal pressure becomes exceptionally strong. This dual function makes Christophii an excellent choice for a lively, low-maintenance garden. Let several heads remain fully open until bloom ends, provide nearby untreated flowers for continuity and consider a shallow water source for beneficial insects. If deer pressure is unusually intense, short-term mesh protection around emerging shoots remains more reliable than scent alone.
Wildlife and pets
Life,around your plants.
Reported toxicity
Yes
Supporting wildlife
Dozens of nectar-rich starry florets attract honeybees, bumblebees, native bees and butterflies in late spring. One broad head provides many feeding points and opens gradually over several days. Group all five bulbs, leave several heads intact until flowering ends and avoid insecticides. Nearby untreated flowers extend the feeding period after Christophii finishes. Because the florets open gradually, one head can remain useful for several days. A shallow nearby water source also supports visiting beneficial insects.