While most Erica irregularis flowers grow from leaf axils, a few are terminal, growing at the stem tips where the leaves point up, the flowers down.
E. irregularis is related and similar to the willowy E. baccans, the berry heath of mountain slopes in the Cape Peninsula. The similarity is not continued to the positioning of their flowers.
Flowering of E. irregularis happens during winter, continuing to about mid-spring (Baker and Oliver, 1967; Privett and Lutzeyer, 2010; Mustart, et al, 1997; iSpot).