Schubert's allium
Allium schubertii ·
The most spectacular allium head: rose-pink stars on stalks of very unequal length, bursting out like a firework half a metre across.
- Size
- 20 in tall, 16 in wide
- Zones
- 5 to 8
- Light
- Full sun
- Flowers
- Late May to late June
- Pets
- Toxic (moderate)
- Job in a bed
- Accent
A bed built around Schubert's allium
The planner designed this bed around Schubert's allium when this page was made: a 12 × 6 ft (3.7 × 1.8 m) English border in zone 6, full sun. It chose the other plants from the 715 that suit those conditions and its dry soil, and says below why Schubert's allium stands where it does.
The plants
- 1 Moor grass 'Greenlee' × 7, tan
- 2 Cheddar pinks 'Tiny Rubies' × 24, pink
- 3 Stiff goldenrod × 3, yellow
- 4 Purple coneflower × 3, purple
- 5 Dwarf English boxwood × 1, dark green leaves
- 6 Nodding onion × 13, pink
- 7 Schubert's allium × 2, pink
- 8 Spring starflower × 8, blue
Why this plant
- Nothing here is unique to it. Its leaf, flower shape and colour are all on the plan already. Its case rests on where it stands and when it performs.
Why here
- Forward of its height. At 20 in it is taller than nodding onion (18 in) behind it, but airy enough to see through.
- 2 plants in 2 places. An accent is a punctuation mark: the repeat along the bed gives it rhythm.
Why now
- In flower for four weeks. From late May to late June.
- Part of the bed's peak. With moor grass 'Greenlee' and Cheddar pinks 'Tiny Rubies' in late May: 3 kinds at once. No week has more.
- Leaves gone by midsummer. They die back and leave bare ground. A perennial that comes up late stands beside it, and grows over the gap.
Planned as an English border: 6 of the 7 groups (86%) are drifts, longer along the bed than they are deep. The bed is balanced: the left half carries 43% of the visual weight and the right half 57%. Cheddar pinks 'Tiny Rubies' is the plant there is most of: 24 of the 61. Every line of the Design check comes out Good or better.
The planner's own design check: 13 Excellent, 4 Good. It flags one thing to watch: Nothing on this plan is highly poisonous or an aggressive spreader.
Open this bed in the planner Change its size, the sun or the style, move plants about, or swap one for another.
Where Schubert's allium goes in a border
At 20 in it belongs in the middle of a bed. In the planner's ten height classes it is medium short (18 to 24 in). It is airy enough to see through, so it can also come forward and veil what is behind it.
Its job: accent. An upright plant used singly, like a punctuation mark, and repeated at intervals to give the bed rhythm.
One flower head is a sculpture. Plant a few where they can be seen whole, and leave the dried heads, which last all summer and are prized for arrangements.
- A conversation piece
- Dried seed heads
- Dry, sunny beds
What to plant with Schubert's allium
Plants recorded as good partners for it, and what each pairing does:
- Lamb's ear: its silver leaves are a setting for the flowers, before and after; low enough (12 in) to stand in front of it; happy in the same dry soil.
- Catmint 'Walker's Low': in flower together for four weeks, from late May; grows up in time to hide its dying leaves; fine leaves against its bold ones.
- Blue fescue: its blue-green leaves are a setting for the flowers, before and after; fine leaves against its bold ones; low enough (10 in) to stand in front of it.
Questions about Schubert's allium
Does Schubert's allium need sun or shade?
Schubert's allium grows in full sun (6 or more hours of direct sun a day).
It wants dry, sharply drained soil, of average fertility, and little watering once settled.
What zones does Schubert's allium grow in?
USDA zones 5 to 8. It is hardy to zone 5, which means it survives winter nights down to about −10 °F (−23 °C).
Above zone 8 it struggles: the zones measure winter cold, but a plant's top zone usually means the summers are too hot or the winters too mild for it to rest.
Gardening in Canada? Use the USDA zone for your town: Canada's own zone map uses different numbers.
When does Schubert's allium flower in my zone?
In zone 5 it flowers late May to late June. As a spring flower it moves about a week for every zone: earlier where it is warmer, later where it is colder.
| Zone 5 | Late May to late June |
|---|---|
| Zone 6 | Late May to late June |
| Zone 7 | Mid May to mid June |
| Zone 8 | Early May to mid June |
Worked out from Hopkins' bioclimatic law: spring arrives about four days later for each degree of latitude north, and one zone is roughly two degrees. A warm spring or a cold one moves any garden two weeks either way.
How far apart should Schubert's allium be planted?
12 in (30 cm) apart, from the middle of one plant to the middle of the next. That is a little closer than its full width of 16 in (40 cm), so a group knits into one patch.
It grows 20 in (50 cm) tall. Give it the full distance from anything taller, or it will lean out towards the light.
How many Schubert's allium plants do I need?
At 12 in apart, set out in staggered rows:
- 12 to fill 10 square feet (about 1 m²)
- 11 for a single row 10 ft (3 m) long
- 38 to fill a 4 × 8 ft bed on its own
In a mixed border, plant it as one at a time, repeated along the bed at intervals; a slender one reads better as a clump of three.
In the bed above, the planner used two in two groups.
Is Schubert's allium poisonous to dogs and cats?
Yes: moderate toxicity to people, dogs, cats and horses. Like all onions, it can damage red blood cells in dogs, cats and horses if eaten. Eating the bulbs in quantity can also upset a person's stomach.
Is there a pet-safe plant like Schubert's allium?
These come closest to doing what Schubert's allium does, and no toxicity is recorded for them:
- Spotted bee balm: the same job in a bed and the same colour; 4 in taller, flowers mid July to early September.
- Peach-leaved bellflower: the same job in a bed; 10 in taller, flowers mid June to mid July.
Matched the way the planner's Swap button matches plants: the same job in a bed, then size, then flowering time.
What can I plant to hide Schubert's allium's leaves after it flowers?
A bulb's leaves have to be left to yellow for about six weeks after flowering, to feed next year's flowers. Plant it among perennials that come up late and spread wide, and they grow over the leaves as they fade:
- Catmint 'Walker's Low': 24 in tall and 2½ ft wide, a recorded partner, in flower mid May to mid September.
- Lady's mantle: 18 in tall and 24 in wide, in flower late May to early July.
- Garden chrysanthemum: 24 in tall and 24 in wide, in flower mid September to late October.
What does Schubert's allium look like in winter?
Schubert's allium is underground: it dies back after flowering and waits as a bulb until spring. Mark where it is, so a fork does not find it first.
More Allium
- Allium 'Ambassador' Allium 'Ambassador'
- Allium 'Gladiator' Allium 'Gladiator'
- Allium 'Globemaster' Allium 'Globemaster'
- Allium 'Mount Everest' Allium 'Mount Everest'
- Blue allium Allium caeruleum
- Chives Allium schoenoprasum
- Curly onion Allium senescens subsp. glaucum
- Drumstick allium Allium sphaerocephalon
- Garlic chives Allium tuberosum
- Giant allium Allium giganteum
- Golden garlic Allium moly
- Japanese onion 'Ozawa' Allium thunbergii 'Ozawa'
- Nodding onion Allium cernuum
- Ornamental onion 'Millenium' Allium 'Millenium'
- Ornamental onion 'Purple Sensation' Allium hollandicum 'Purple Sensation'
- Ornamental onion 'Summer Beauty' Allium 'Summer Beauty'
- Pink lily leek Allium oreophilum
- Sicilian honey garlic Allium siculum
- Star of Persia Allium christophii
- Turkestan onion Allium karataviense
In these guides
Every fact on record
- Type
- Bulb
- Size
- 20 in (50 cm) tall, 16 in (40 cm) wide
- Plant
- 12 in (30 cm) apart
- Height class
- Medium short (18 to 24 in)
- Place in the bed
- Middle, or further forward: it is airy enough to see through
- Flowers
- Late May to late June; globes; pink
- Leaves
- Bold texture, summer-dormant; green
- Shape
- Upright, clumping
- Hardy in
- USDA zones 5 to 8
- Light
- Full sun
- Soil
- Average, dry and sharply drained
- Water
- Low
- Feeding
- None needed
Not yet checked against an outside reference: its figures rest on general horticultural knowledge. Flowering times are for zone 5: later in colder zones, earlier in warmer ones. Toxicity and spread information is a general gardening guide, not veterinary or medical advice, and invasive status varies by region. If a person or pet eats a plant, contact poison control or a vet. Check your local invasive species list before planting anything with a spread warning.