• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Zaluzianskya ovata

night scented phlox

  • Other common names night scented phlox

  • Family Scrophulariaceae

  • Genus Zaluzianskya is a genus of compact, semi-evergreen perennials. By day, the flowers remain tightly curled up but by evening, uncurl into scented star-shaped white flowers blooming from mid to late summer.

  • Details a compact, clump-forming, evergreen perennial growing to 25cm tall. Its sticky leaves are up to 4cm long with toothed edges. White flowers with crimson-red backs are up to 2.5cm across with notched petal tips and arehighly scented in the evenings

  • Plant range Africa, Lesotho


  • Foliage Evergreen

  • Habit Bushy

  • Fragrance Flower

  • Hardiness

    Hardiness ratings

    All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

    • H1a - Under glass all year (>15C)
    • H1b - Can be grown outside in the summer (10 - 15)
    • H1c - Can be grown outside in the summer (5 - 10)
    • H2 - Tolerant of low temperatures, but not surviving being frozen (1 to 5)
    • H3 - Hardy in coastal and relatively mild parts of the UK (-5 to 1)
    • H4 - Hardy through most of the UK (-10 to -5)
    • H5 - Hardy in most places throughout the UK even in severe winters (-15 to -10)
    • H6 - Hardy in all of UK and northern Europe (-20 to -15)
    • H7 - Hardy in the severest European continental climates (< -20)




  • Full Sun

  • Aspect South-facing or North-facing or West-facing or East-facing

  • Exposure Exposed or Sheltered


  • Clay


  • Loam


  • Sand


  • MoistureMoist but well-drained

  • SoilClay, Loam, Sand

  • pHAcid, Alkaline, Neutral


  • Ultimate height 0.1-0.5 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grows best in full sun in a moist yet sharply-drained humus-rich soil. Ideal for container planting

Propagation Propagate by seed in spring or by cuttings in summer

Suggested planting locations and garden types Patio & Container Plants

How to care

Pruning Cut back hard after flowering to maintain their bushy habit

Pests Generally trouble free

Diseases Generally trouble free

Did you find the information you were looking for?

RHS members can get exclusive individual advice from the RHS Gardening Advice team.

Join the RHS now

Get involved

The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.