Common lilac(Syringa vulgaris 'Sensation')

Overview

Sensation common lilac (Syringa vulgaris ‘Sensation’) is one of the most famous and visually striking deciduous flowering shrubs in horticulture, holder of the Royal Horticultural Society’s Award of Garden Merit. Discovered in 1938 by Dutch nurseryman Dirk Eveleens Maarse as a sport of ‘Hugo de Vries’, it is celebrated worldwide for its unique picotee bicolor florets: each rich wine-red to purple-violet petal is crisply outlined with a pure white border. Growing 8 to 12 feet tall and 6 to 10 feet wide, it blankets its upright branching framework in May with huge, intensely fragrant conical trusses that perfume spring gardens and make unforgettable cut-flower arrangements.

Its broad, dark green heart-shaped leaves provide dense summer screening after the flowering window concludes.

How to Grow

• Hardiness & Winter Chill Requirement: USDA Zones 3 through 7. Lilacs possess an obligate winter chilling requirement and thrive only in regions with cold freezing winters. They perform poorly and fail to bloom in warm-winter climates south of Zone 7.
• Full Sun is Essential: Minimum 6 hours of direct, unobstructed sunlight daily. Shaded shrubs produce sparse, leggy canes and few flower trusses.
• Neutral to Alkaline Soil: Unlike acid-loving azaleas, common lilacs thrive in fertile, moisture-retentive, well-draining soils with a neutral to slightly alkaline pH (6.5 to 7.5). In naturally acidic soils, apply agricultural lime annually to maintain vigor.
• Pruning Discipline (Blooms on Old Wood): Flower buds are set in late summer on old wood. Prune immediately after blooms fade in late May. Cutting lilacs in autumn or winter strips away next spring’s flower buds. Remove spent flower heads down to the first lateral shoots, and periodically renew mature shrubs by cutting one-third of the oldest, thickest canes down to ground level every 3 years.

Landscape Uses

• Fragrant Specimen Shrub: Plant near patios, front porches, and garden gates where its sweet perfume can be savored.
• Informal Privacy Screen: Spaced 6 feet apart on center, multiple shrubs form a dense, flowering deciduous boundary hedge.
• Cut Flower Garden: Spectacular, long-stemmed bicolor trusses last up to a week in fresh water vases indoors.

Potential Problems

• Powdery Mildew in Late Summer: A white powdery coating can develop on foliage during humid, stagnant August weather; while unsightly, it is cosmetic and does not kill the shrub. Site in full sun with good air circulation.
• Pruning in Autumn or Winter: Strips off all flower buds for the coming season; always prune right after spring bloom.
• Lack of Winter Chill: Fails to set flower buds in warm southern zones (Zone 8 and warmer).

Frequently Asked Questions

What does “picotee” mean on a lilac?

“Picotee” describes petals that have a contrasting border color. On ‘Sensation’, each single deep purple floret is rimmed in a crisp, clean white edge.

When should I prune ‘Sensation’ lilac?

Prune immediately after the blooms fade in late May. Lilacs form next year’s flower buds during the summer, so fall or winter pruning will remove all spring blossoms.

Does common lilac tolerate clay soil?

Yes, provided drainage is adequate and water does not sit stagnantly around the roots. Lilacs prefer neutral to alkaline soils.

Companion Plants

Pair Sensation lilac with other spring-blooming shrubs and perennials that share its love of full sun and neutral soil:

• Flowering Shrubs: Plant near mock orange (Philadelphus), Koreanspice viburnum (Viburnum carlesii), or spirea.
• Perennial Underplantings: Combine with peonies (Paeonia), bearded irises, or creeping phlox.
• Spring Flowering Bulbs: Underplant with late-season tulips, alliums, and daffodils around its base.

Sources & Lineage

• Missouri Botanical Garden PlantFinder: Record taxon 253923 (Syringa vulgaris ‘Sensation’) — Eveleens Maarse 1938 Dutch heritage, dimensions, and cultivation.
• Kew Plants of the World Online (POWO): Syringa vulgaris L. (POWO: 289009-2) — species taxonomy, family (Oleaceae), and Balkan native range.
• Royal Horticultural Society (RHS): Syringa vulgaris ‘Sensation’ AGM Profile — Award of Garden Merit evaluation, picotee coloration, and pruning rules.