Lobelia tomentosa is a tufted shrublet that grows branched, hairy stems to heights around 40 cm. The hard, hairy leaves are long and narrow, up to 5 mm in width. They are toothed with margins that are rolled under.
The flowers are borne on long, wiry, erect scapes above the leaves. They are blue, violet or sometimes pink in colour, nearly 2 cm long and hairy. The plant flowers all year round.
The distribution of the species is coastal from the Cape Peninsula to KwaZulu-Natal. The species is not considered threatened early in the twenty first century (Manning, 2009; Mustart, et al, 1997; www.redlist.sanbi.org).