Butterfly bush 'Black Knight' (Buddleja davidii) - nectar-rich shrub - 17 cm pot - Height 45 cm

Yes, the Buddleja davidii 'Black Knight' is o'ne of the most effective shrubs for attracting butterflies to the garden. Its flower spikes secrete an abundant and very sweet nectar, particularly appreciated by diurnal species such as the red admiral, peacock butterfly, swallowtail or lemon butterfly. The intense fragrance of its purple flowers acts as a real chemical signal perceptible from several meters away. Bees and bumblebees also frequent the 'shrub intensively in summer. Planting several specimens in a mass planting multiplies the 'attraction effect and contributes concretely to the pollination of the garden.

The Buddleja davidii 'Black Knight' starts flowering in July and continues to produce new panicles until 'October, sometimes until 'the first frosts. The total flowering period often exceeds 3 months, making it 'one of the shrubs with the longest summer flowering period in temperate gardens. By regularly removing faded panicles (deadheading), you stimulate the 'production of new flower stems and prolong the display. The very dark purple colour of the 'Black Knight' cultivar contrasts with the brightness of 'summer and remains intense even in hot weather.

Under good growing conditions, the Buddleja davidii 'Black Knight' can reach 2.5 to 3 meters in height and a similar spread in a few years. It grows rapidly, often by 50 to 80 cm per year when'it enjoys 'full sun and 'well-drained soil. Without annual pruning, it becomes large and woody, with less abundant flowering higher up. Spring pruning, carried out every year, keeps the 'shrub more compact (1 to 1.5 m) and promotes abundant flowering on new stems.

Upon receipt, your Butterfly Tree 'Black Knight' is delivered in a 17 cm pot, ready to be planted. Choose a spot in full sun and dig a hole twice as wide as the root ball. Incorporate a little compost at the bottom to promote establishment, without excess that would overstimulate foliage growth. Plant at the same depth as in the pot, lightly firm the soil around the root ball and water thoroughly. For the first few weeks, maintain regular moisture to encourage r'ooting, then gradually reduce watering.

Yes, the Buddleja davidii 'Black Knight' is a fully hardy shrub that can withstand severe frosts down to around -15 °C. It spends the 'winter in the ground in almost all regions of France, including areas with cold winters. Its above-ground stems may be damaged or even destroyed during 'particularly harsh winters, but the rootstock invariably regrows in spring, often with increased vigor. During the first few years, a 10 to 15 cm layer of mulch at the base of the plant provides extra protection for the still relatively shallow roots.

It is entirely possible to grow Buddleja davidii 'Black Knight' in a large container on a sunny terrace, provided you give it a pot d'at least 40 to 50 cm in diameter and sufficient depth. Use a well-draining substrate, a mixture of multipurpose compost and gravel or perlite, and make sure the pot has effective d'rainage holes. In a container, th'e shrub requires more regular watering than'when planted in the ground, especially during periods of intense heat. Spring pruning is even more beneficial in a pot, as it limits the size and stimulates flowering.

The Buddleja davidii 'Black Knight' pairs beautifully with o'ther sun-loving perennials and shrubs. At the front of a border, pair it with lavender, salvias, or agapanthus, whose blues and purples echo its dark spikes while attracting the same pollinators. Coneflowers or black-eyed Susans add a yellow and orange note that contrasts beautifully with the deep purple of the 'Black Knight'. For a colorful informal hedge, combine it with o'ther buddlejas in different colors (white, pink, red) for a kaleidoscope effect from July to October.