Pruning, Vase, Meaning & Flowering Season
When lilac is in bloom, all of Vienna smells like spring. No other shrub is so deeply rooted in Austrian garden culture.
Lilac belongs to Vienna just like St. Stephen’s Cathedral. In the courtyards of the historic apartment buildings, in the gardens on the outskirts, in the Volksgarten — everywhere it blooms in white, lilac, and pink in late April and early May. Its fragrance is so intense that you notice it from afar.
And yet lilac is not actually native to Austria. It arrived in Vienna from the Ottoman Empire in the 16th century — as a diplomatic gift. Since then, it has become such a natural part of the city that it’s hard to imagine Vienna without lilac. The University of Vienna’s Botanical Garden is home to one of Europe’s most important lilac collections.
Lilac at a Glance
Botanical name: Syringa vulgaris
Origin: Southeastern Europe, Turkey
Height: 3–6 metres
Hardy: Yes, down to –30°C
Flowering season: April–May (2–3 weeks)
Vase life: 3–5 days
Colours: Lilac, White, Pink, Deep Violet
Difficulty: easy
Lilac Flowering Season
The lilac flowering season in Austria falls between late April and mid-May — depending on the variety and location. In Vienna, common lilac (Syringa vulgaris) usually starts flowering in early May. The bloom lasts only two to three weeks, and then it’s over. That fleeting beauty is exactly what makes lilac so special — you wait all year for those few short weeks.
However, there are varieties that flower at different times. If you combine early, mid-season, and late varieties in the garden, you can extend the lilac flowering season to six weeks. The variety 'Miss Kim', for example, flowers noticeably later than common lilac.
Pruning Lilac
When pruning lilac, many people make one crucial mistake: they cut at the wrong time. Lilac forms its flower buds in the summer of the previous year. If you prune in autumn or winter, you remove next year’s blooms.
The right time for pruning is immediately after flowering, so in late May or early June. Remove spent flower panicles and thin out shoots that are too dense or too old. Leave the young shoots in place — that’s where the lilac will flower next year.
Old, overgrown lilac bushes can be cut back hard to 50 cm. That means sacrificing two years of flowering, but afterwards the shrub will grow back strong and youthful. This method works reliably with common lilac.
Lilac in the Vase
Lilac in a vase is beautiful, but honestly: it does not last especially long. Three to five days is realistic. But the fragrance in your home is priceless.
To help it last as long as possible: Cut a cross into the woody stems at the ends or gently tap them with a hammer — this improves water absorption. Remove all leaves that would sit below the waterline. Use cool water and change it daily. Do not place it in direct sun.
Tip: Lilac is best cut in the morning, when about two thirds of the panicles are open. Fully open panicles do not last as long in the vase.
Lilac varieties for the garden
Alongside the classic common lilac, there are also varieties that are better suited to smaller gardens and balconies:
- 'Andenken an Ludwig Späth' — dark violet, strongly fragrant, the classic in Austrian gardens
- 'Madame Lemoine' — pure white, double-flowered, a refined French variety
- 'Miss Kim' — compact (max. 2 m), late-flowering, ideal for small gardens
- Dwarf lilac (Syringa meyeri 'Palibin') — only 1.5 m tall, also suitable for pots
Meaning of lilac
The meaning of lilac is first love, innocence, and remembrance. In Victorian flower language, purple lilac stood for first love, while white lilac symbolized purity and youth. In Austria, lilac is also a symbol of spring itself — when lilac blooms, winter is truly over.
Seasonal bouquets at MoBlumen Vienna
Fresh bouquets with seasonal flowers — hand-tied, delivery in Vienna.
Frequently asked questions about lilac
The most common reasons: pruned at the wrong time (autumn/winter instead of after flowering), too much nitrogen fertilizer (encourages leaves instead of flowers), too little sun, or the shrub is still too young (lilac often needs 3–4 years before its first bloom).
Dwarf lilac varieties such as 'Palibin' or 'Miss Kim' do well in a large pot (at least 40 liters). Common lilac grows too large for that. In winter, wrap the pot with fleece so the roots do not freeze through.
Lilac (Syringa) is considered non-toxic. The blossoms are even edible and are used in the kitchen for syrup, jelly, or as decoration. Do not confuse it with the poisonous laburnum, which is sometimes mistakenly called “lilac.”
Fresh flowers at MoBlumen Vienna
Hand-tied bouquets and houseplants — delivery in Vienna.
