Liliac de vara parfumat - Buddleja davidii 'Lochinch' (Butterfly Bush)

Buddleja davidii 'Lochinch', also known as the "butterfly bush" or "summer lilac," is a hybrid cultivar of the species Buddleja davidii from the figwort family. This deciduous shrub is valued for its fragrant flowers of a delicate lavender-violet hue and for its ability to attract butterflies and other pollinators. With a more refined appearance than other varieties, 'Lochinch' is a popular choice for gardens due to its abundant blooming and decorative foliage.

Appearance of leaves, flowers, and fruits

• Leaves: The leaves are lance-shaped, a silvery gray-green on the upper side and silvery-white underneath, with a velvety texture, 10-20 cm long. They are arranged opposite on the branches and fall in autumn without developing significant colors.
• Flowers: The flowers are small, tubular, grouped in dense, conical panicles 15-25 cm long, of a soft lavender-violet color with an orange center. They appear from July to September, giving off a sweet, floral scent that attracts butterflies, bees, and moths. Blooming can be extended by removing faded flowers.
• Fruits: The fruits are small, brown capsules, not ornamental, containing fine seeds. In some regions, the seeds may contribute to the plant’s invasive spread.
• Scent: The floral, sweet, and subtle scent is a strong point, being more pronounced on warm days.

Growth characteristics

• Height and width: It grows as a compact shrub, reaching 2-2.5 meters in height and 1.5-2 meters in width, with arching branches forming a rounded crown, neater than other varieties.
• Vigor: It has a moderate to fast growth rate, producing flexible branches but less sprawling than other cultivars.
• Type: It is a deciduous shrub with multiple stems, producing few shoots from the roots, maintaining a relatively compact shape.

Growing conditions

• Exposure: Prefers full sun for maximum flowering but also tolerates partial shade, with a reduction in flower number. A sunny and well-ventilated spot prevents diseases.
• Soil: Adapts to most soil types, preferring a fertile, well-drained soil with a neutral to slightly alkaline pH (6-7.5). It tolerates poor or chalky soils, but drainage is essential.
• Watering: Needs regular watering in the first years and during dry spells, but once established, it tolerates moderate drought well. Avoid waterlogged soils.
• Pollination: The flowers attract many pollinators, especially butterflies, significantly contributing to garden biodiversity.

Care and resistance

• Hardiness: It is hardy to temperatures down to -20°C (zones 5-9), suitable for temperate climates, including Romania. Young branches may be affected by late frosts, but the plant regenerates quickly.
• Fertilizing: Apply a balanced fertilizer (e.g., 10-10-10) in early spring to stimulate growth and flowering. Avoid excess nitrogen, which favors leaves over flowers.
• Pruning: Prune hard in February-March, cutting branches back to 30-50 cm from the ground to encourage abundant flowering and maintain a compact shape. Remove faded flowers during summer to prolong blooming.
• Pests and diseases: May be affected by mites, aphids, or powdery mildew in damp conditions. Good ventilation and avoiding wetting the leaves prevent problems.
• Invasiveness: Buddleja davidii can become invasive in some regions due to wind-dispersed seeds. Removing faded flowers reduces this risk.
• Wildlife: It is a magnet for butterflies, bees, and moths, being an essential plant for gardens that support biodiversity.

Uses

Buddleja davidii 'Lochinch' is ideal for mixed borders, informal hedges, or as a solitary plant in cottage, modern, or wild gardens. The lavender-violet flowers combine beautifully with plants such as sage, rosemary, or white roses. It can be grown in large containers on terraces but requires regular pruning. It is perfect for landscapes aiming to attract pollinators and offer delicate summer color.

Origin

Buddleja davidii is native to China, where it grows in rocky areas and riverbanks. The 'Lochinch' cultivar is a hybrid resulting from crossing Buddleja davidii and Buddleja fallowiana, developed in Scotland at Lochinch Castle in the 1940s. It is valued for its silvery foliage, refined flowers, and more compact stature than other varieties.