Buddleja glomerata is a shrub endemic to the mountains of the Karoo desert in South Africa, where it grows among boulders on dry hillsides.

[1] The shrub has a number of common names locally, the most popular being 'Karoo Sagewood'.

The inflorescence is a terminal panicle < 15 centimetres (5.9 in) in diameter, comprising congested cymes forming sub-globose heads of 10–20 faintly-scented yellow flowers, the yellow anthers protruding from the corollas.

The shrub was introduced to commerce in the UK in the late 1990s, where it has proven hardy down to −7 °C (19 °F) grown against a south-facing wall.

[5] The species is grown as part of the NCCPG national collection held by Longstock Park Nursery, near Stockbridge, Hampshire.