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Lilac Katherine Havemeyer

Syringa vulgaris 'Katherine Havemeyer'

shrub

Katherine Havemeyer is a classic double-flowered lilac cultivar renowned for its large, intensely fragrant panicles of purple-lavender blooms with a silvery reverse. This deciduous shrub grows 8-10 feet tall and wide, making it ideal for borders, hedgerows, and specimen plantings. It's celebrated for exceptional fragrance and the longevity of its flowers.

Growing Conditions

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Sun: Full sun, minimum 6 hours daily (8+ hours preferred for best blooming)

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Water: Moderate water needs; water deeply but infrequently. Prefers consistent moisture during growing season but is drought-tolerant once established. Avoid waterlogging.

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Spacing: 96 inches

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Days to maturity: 3-5 years to reach full flowering maturity

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Planting depth: Plant grafted specimens at graft union level (at or slightly above soil surface); bare-root in fall or early spring

Soil

Type: Well-draining loamy soil, neutral to slightly alkaline

pH: 7.0-7.5

Amendments:

Compost or aged manure Lime if soil is acidic Bone meal for phosphorus

Growing Zones

Find your zone →

Thrives in zones 3-7, cold-hardy and adaptable

3a 3b 4a 4b 5a 5b 6a 6b 7a 7b

Growth Stages

Establishment

First 12 months

Newly planted shrub developing root system, minimal growth above ground

Water regularly (daily to every other day) first season; stake if needed; mulch lightly around base. Avoid fertilizing year one.

Vegetative Growth

Years 2-3

Shrub develops framework branches and foliage; no flowers yet

Light pruning to shape; remove crossing or weak branches. Allow shrub to establish main structure. Water during dry spells.

Transition to Flowering

Late summer into fall (year 3)

Buds begin forming on branch tips; new growth continues

Reduce nitrogen-heavy fertilizers; apply low-nitrogen formula or bone meal. Ensure full sun exposure. Do not prune heavily.

Flowering

4-6 weeks (May-June depending on region)

Massive double panicles of purple-lavender flowers open in mid to late spring; extremely fragrant

Deadhead spent flowers just below the panicle to encourage bushier growth (optional, as some prefer seed heads). Enjoy fragrance; flowers last 2-3 weeks.

Post-Bloom & Summer

June-August

Foliage remains healthy and green; shrub enters summer dormancy phase

Remove any dead wood; light shaping allowed. Water during hot, dry spells. This is when to make any major pruning cuts if needed.

Companion Planting

Plan your garden →

Plant with:

Delphinium Peony Catmint Russian sage Lamb's ear Weigela Viburnum Tulips

Avoid planting near:

Black walnut (juglans nigra) Shallow-rooted trees competing for water Heavy shade-casting conifers directly north

Common Pests

Remove infested branches; use pheromone traps; maintain shrub vigor through proper watering and pruning
Ensure good air circulation; avoid overhead watering; apply sulfur dust or neem oil if severe; choose resistant varieties
Remove heavily infested leaves; not usually life-threatening; maintain plant health
Hand-pick early morning; use pheromone traps; neem oil; encourage natural predators
Horticultural oil spray in early spring; prune out heavily infested branches

Uses

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Floral flavoring and garnish

Culinary

Lilac flowers are edible and can be used as delicate garnishes for desserts, salads, and cocktails. They have a subtle floral, slightly sweet flavor and beautiful visual appeal. [source]

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Cut flower arrangements and fragrance

Household

Katherine Havemeyer lilacs are prized for elaborate indoor bouquets and arrangements, providing exceptional fragrance throughout the home for 1-2 weeks. They're classic spring additions to floral designs. [source]

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Traditional herbal tea and wellness

Medicinal

Lilac flowers and leaves have been used in traditional medicine to make teas believed to support immune function and digestive health, though scientific evidence is limited. [source]

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Dried flowers and potpourri

Craft

Dried lilac flowers retain their fragrance and can be used in potpourri, sachets, and craft projects. Air-dry blooms away from sunlight for best color retention. [source]

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Pollinator support

Wildlife

Lilac flowers attract butterflies, bees, and other pollinators, making them valuable for supporting local pollinator populations and garden biodiversity in spring. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Cut blooms in early morning when flowers are fully open but still fresh; cut stems at an angle and immediately place in cool water. For indoor arrangements, change water every 2 days and re-cut stems. Deadheading spent flowers (removing panicles below the bloom cluster) encourages bushier growth and may increase flowering in future seasons.

Fun Facts

🌱 Katherine Havemeyer was registered in 1921 and named after a prominent horticulturist and plant collector; it remains one of the most fragrant lilac cultivars available, with some claiming its scent is the strongest among double-flowered varieties.
🌱 Lilac flowers contain linalool and other volatile compounds responsible for their distinctive fragrance; the scent is strongest on warm, calm mornings and can persist for several weeks in fresh arrangements.
🌱 Despite their popularity, lilacs require cold winters (below 45°F) to set flower buds properly—a phenomenon called 'chilling requirement'—which is why they struggle in warm climates but thrive in northern regions.

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