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Pollinator

Violet carpenter bee

Xylocopa violacea

Plate: The Naturalist's Library: Bees (Jardine, 1840) ; planche W. H. Lizars · Public domain · source

Role in the garden

One of the largest solitary bees in Europe (up to 2.5 cm). Bores its galleries in dead wood, where it raises its young. Solitary but impressive.

Activity period

April to September

How to attract / manage it

Not aggressive: the female stings only as a last resort, mostly to defend her nest, and the sting is painful. The male, stingless, darts buzzing at intruders but cannot sting.

Practical guide

Where to find them

A loud, recognisable flight: a bluish-black body, wings iridescent violet-black. Visits large or elongated flowers (wisteria, comfrey, sages). Nests in dead wood: exposed beams, dead trunks, old sheds.

Prevention

Leave dead wood in place in the garden: an abandoned trunk, old beams, thick dry bamboo. Do not fill in the galleries you see, they serve for several years. Large-flowered plants (wisteria, comfrey, sages).

Sources

  • von Reumont, B.M., Dutertre, S. & Koludarov, I. (2022). Venom profile of the European carpenter bee Xylocopa violacea: evolutionary and applied considerations on its toxin components. Toxicon: X, 14, 100117.

Favourite plants / resources

Related plant entries

Rosemary

An evergreen, woody shrub, rosemary gives the dry garden a permanent structure: it forms low Mediterranean edges and hedges where few other plants thrive. Its very early flowering, from the tail end of winter, makes it one of the year's first nectar sources for honeybees and bumblebees emerging from overwintering, a valuable melliferous link while the garden is still bare. Traditionally planted alongside carrots and cabbages, its strongly aromatic foliage is reputed to confuse the scent cues of some pests, including the carrot fly. Needing little water once established, it holds its place in rockeries, on terraces and in dry, little-watered areas, where its evergreen foliage provides aromatic cover all year round.

Lavender

A Mediterranean subshrub with evergreen grey foliage, true lavender forms structuring low edges and hedges that hold the dry garden together in full sun, on poor, dry, free-draining soils. Its summer flowering is among the most melliferous in the garden: it offers nectar and pollen at the height of summer, an often lean period, and draws honeybees, bumblebees, butterflies and hoverflies, the latter beneficial insects whose larvae devour aphids. A refuge for wild pollinators, it is traditionally planted along vegetable borders and near roses, its scent reputed to help diversify the surrounding odours. Drought-tolerant and hardy once established, it clothes rockeries, banks and paths without watering, while keeping its grey outline all year round.

Sage

A nectar-bearing herb traditionally planted near cabbages: its scent is said to confuse cabbage-white pests. A medicinal plant (leaf listed in the European Pharmacopoeia).

Comfrey

A mainstay of fruit-tree guilds: its potassium-rich leaves are cut several times a season and dropped at the base of trees as a living mulch (chop-and-drop) or steeped into a potassium-rich liquid feed, traditionally used to support flowering and fruiting. Ringed around an apple tree, it covers the ground, checks competing grass and draws bumblebees to its nectar-rich bells. The sterile 'Bocking 14' cultivar does not self-seed, which keeps it easy to contain. It is one of the most widely used fertilising-biomass plants in permaculture.