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Agapanthus cultivar

Agapanthus 'Queen Mum'

deciduous agapanthus cultivar

V Written by Editorial Team · Updated January 2026

A tall, bicolored agapanthus that carries large rounded flower heads of white petals flushed blue at the base. Stems rise well above the foliage in mid to late summer, giving a bold architectural look in borders and large containers. Plants prefer full sun and moist but well‑drained soil, and benefit from winter mulch where freezes occur. In much of North America it is treated as a perennial in warm coastal and southern regions and as a container plant elsewhere. All parts are harmful if eaten; wear gloves if the sap contacts skin.

Agapanthus 'Queen Mum'
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Queen Mum

deciduous agapanthus cultivar

At‑a‑glance

  • Group/Class: deciduous agapanthus cultivar
  • Height × spread: 40 to 48 in (100 to 120 cm) × 15 to 20 in (40 to 50 cm)
  • Bloom window: mid to late summer
  • Color & flower form: large rounded umbels; white with blue at petal bases
  • Fragrance: 0 none
  • USDA hardiness: varies by climate; commonly grown as perennial in zones 8 to 10
  • Breeder / Year / Origin: unknown; trade designation ‘PMN06’
  • Cut‑flower notes: thick stems; typical vase life about 7 to 10 days
  • Pet safety: avoid

How it differs

  • Bicolored flowers contrasted with the single‑colored heads of most cultivars.
  • Taller stature than common compact forms like ‘Peter Pan’.
  • Dense, rounded umbels on sturdy stalks for a strong architectural effect.
  • Semi‑evergreen to deciduous habit depending on winter conditions.

Strengths

  • Statement flower heads for midsummer displays.
  • Performs well in sunny, well‑drained coastal settings.
  • Useful as a feature in large containers.
  • Good stem height for cutting.

Care in one minute

Full sun; provide at least 6 hours of direct light.

Soil: fertile, moist but well drained; incorporate organic matter on planting.

Water: steady moisture through bud set; reduce after flowering.

Feed: low‑nitrogen, high‑phosphorus fertilizer in late spring.

Deadhead after bloom to keep clumps tidy and limit self‑sowing.

Winter: mulch crowns in cold snaps; overwinter containers frost‑free.

Watch‑outs

  • Borderline hardy; protect crowns in colder winters.
  • Wet, heavy soils can reduce flowering and increase rot risk.
  • Snails and slugs may mark emerging leaves.

Best uses (tags)

  • borders
  • containers
  • cutting
  • architectural
  • coastal

Provenance note

Marketed as ‘Queen Mum’ with cultivar code ‘PMN06’; recorded in the RHS Plant Finder and listed with UK hardiness guidance.

References

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Written by: Your Flowers Guide editorial team
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