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‘Henri Robert’ lilac

Syringa vulgaris ‘Henri Robert’

sih-RIN-gah vul-GAR-is

This cultivar has double bluish-purple flowers that open from violet buds in midseason. It forms a shrub 12 feet high by 8 feet wide.

Noteworthy CharacteristicsLilac flowers are beloved for bouquets, and when in bloom, hummingbirds and butterflies are drawn to them. Lilacs are generally a forgiving bunch, tolerant of roadside sites and neglect. 

CareGrow in reasonably fertile, well-drained soil in full sun; prefers neutral to slightly alkaline soil. Promptly deadhead spent blossoms to produce more robust blooms for the following year. Prune lightly or renovate in late winter or early spring to maintain a healthy framework, remembering that most species form flowers the previous season. Plant in areas with good air circulation to thwart disease. Because lilacs are fire retardant, they can be considered for planting near homes that are susceptible to wildfires. Most lilacs require a period of chilling dormancy.

PropagationSow seed in a cold frame when fresh or in the spring. Take softwood cuttings or layer in early summer. Graft in winter; bud in summer.

ProblemsPowdery mildew, dieback, leafroll virus, mycoplasma-like organisms (MLO), root knot nematode, Verticillium wilt, witches' broom, bacterial leaf spot, anthracnose, borers, scale, caterpillars.

  • Genus : Syringa
  • Plant Height : 10 to 15 feet
  • Zones : 3, 4, 5, 6, 7
  • Plant Width : 6 to 10 feet
  • Characteristics : Attracts Hummingbirds, Cut flower, Fragrant Flowers
  • Uses : Color, Foundation Plantings, Front Yard, Sun
  • Bloom Time : Early Spring, Spring
  • Light : Full Sun to Partial Shade
  • Foliage Color : Green
  • Maintenance : Low
  • Moisture : Medium Moisture
  • Growth Rate : Moderate
  • Flower Color : Purple
  • Plant Type : Shrubs
  • Plant Seasonal Interest : Spring Interest

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