Berzelia is a genus consisting of 12 species of upright, wiry stemmed, evergreen shrubs with a dense covering of small, fine, needle-like leaves. The flowers which appear in spring and summer, are minute but are packed in spherical clusters, of which there are several per head of bloom. The flowers are white to cream and, because the stamens extend beyond the tiny petals, the flower heads appear to be studded with protrusions. In cultivation, they are best grown in light well-drained soil with adequate moisture, positioning in full sun. Light trimming will retain the compact form after flowering. Most species are easily propagated from seed or small half-hardened tip cuttings.

Berzelia intermedia is a South African endemic species from the Western Cape Province. It is commonly known as Knopbos, Knopbossie, Knoppiesbos, Knoppiesbossie, Kolkol or Kolkolbos. It grows into a perennial shrub of around 1 meter tall and round. During spring it bears cream heads in clusters. This makes an excellent cut flower.