Overview
Aster ageratoides Sirius ('Bocosir') is a clump-forming, upright stems herbaceous perennial in the genus Aster, part of the Asteraceae family, with mid green, narrowly lance-shaped to linear foliage. Aster ageratoides Sirius ('Bocosir') grows best in full sun and partial shade, and tolerates loam soils and neutral pH. Its UK hardiness is rated H6. Suggested uses include borders, cottage gardens and mixed borders.
About
Aster ageratoides Sirius ('Bocosir') is a clump-forming perennial cultivar within the Aster genus, known for its upright stems and mid-green, narrowly lance-shaped to linear leaves. This cultivar thrives in fertile, moisture-retentive loam soil with a neutral pH, preferring full sun or partial shade in sheltered, south- or west-facing positions. Hardy to UK zone H6, it is suitable for borders, cottage gardens, and mixed borders, providing interest during the summer and autumn seasons. Propagation can be achieved through division or seed sowing.
About the genus
Aster is a genus of perennial flowering plants in the family Asteraceae. Its circumscription has been narrowed, and it now encompasses around 170 species, all but one of which are restricted to Eurasia; many species formerly in Aster are now in other genera of the tribe Astereae. Aster amellus is the type species of the genus and the family Asteraceae.
Wikipedia contributors, "Aster (genus)", CC BY-SA 4.0 — Aster (genus)
Growing conditions
Best soil and position for Aster
- Sunlight
- Full sun, Partial shade
- Soil type
- Loam
- Soil pH
- Neutral
- Soil moisture
- Moisture-retentive
- Aspect
- South-facing, West-facing
- Exposure
- Sheltered
- UK hardiness
- H6
Plant details
Aster ageratoides Sirius ('Bocosir') size, habit and characteristics
- Plant type
- Herbaceous Perennial
- Habit
- Clump-forming, Upright stems
- Foliage
- Mid green, Narrowly lance-shaped to linear
- Suggested uses
- Borders, Cottage gardens, Mixed borders
Care notes
Pruning and caring for Aster ageratoides Sirius ('Bocosir')
- Propagation
- Division, Seed sowing
- Pest resistance
- Generally pest-resistant
- Disease resistance
- Generally disease-resistant
Frequently asked questions
Where is the best place to plant Aster ageratoides Sirius ('Bocosir')?
Aster ageratoides Sirius ('Bocosir') prefers full sun and partial shade. It suits sheltered positions.
What soil does Aster ageratoides Sirius ('Bocosir') need?
Aster ageratoides Sirius ('Bocosir') grows best in loam soil. It prefers neutral soil. Aim for soil that stays moisture-retentive.
Is Aster ageratoides Sirius ('Bocosir') hardy in the UK?
Aster ageratoides Sirius ('Bocosir') has an RHS hardiness rating of H6, meaning it is very hardy, tolerating -20 to -15°C across most of the UK.
How do I propagate Aster ageratoides Sirius ('Bocosir')?
Division, Seed sowing.
More in the Aster genus
- Aster ageratoides 'Ezo Murasaki'Balsam Aster

- Aster amellus 'Violet Queen'European Michaelmas Daisy
- Aster canus

- Aster divaricatusWhite Wood Aster
- Aster pyrenaeus

- Aster pyrenaeus 'Lutetia'

- Aster tataricus 'Jindai'Tatarian Aster
- Aster thomsoniiThomson's aster