Grow Erica quadrangularis in well-drained acidic (pH between 5 and 6.5) soil, in a sunny or semi-shaded position. It prefers a moderate to well-watered site, but it must have good drainage. It will take sandy soils and heavier clay soils. Feed in autumn and spring with a generous mulch of well rotted compost and low doses of fertilizer (no manure). Prune lightly to shape. Grow it in the fynbos garden, in the rockery, on terraces, in the mixed shrubbery, mixed borders This heath is also suitable for containers, using a well-drained, acidic, sandy loam, containing 50% well rotted compost, but no manure or strong fertilizers (use slow release or low doses).

Propagate by seed or cuttings. Sow seed in late summer to autumn (March-May), in well-drained sandy soil. Keep warm and moist. Treatment with Instant Smoke Plus Seed Primer will enhance germination. Use a well-drained, acidic medium. Because the seed is so fine it needs only a light covering of clean sand, or the seeds can be mixed with dry sand and the mixture of seed and sand spread in a thin layer on top of the sowing medium. Water with a fine rose to avoid displacing the seeds. Keep the trays damp but not wet and out of direct sun in a warm, but not hot, situation. Germination takes 1 to 2 months. Transplant the seedlings when they are about 10 mm high. Grow on in light shade until they are established.

Take semi-hardwood heel cuttings in late summer, autumn or spring. Treat with a rooting hormone suitable for semi-hardwood cuttings. Place in well-aerated medium, under mist on heated benches (24 o C). Pot the rooted cuttings in a well-drained, acidic soil medium and harden off in light shade for a month or two.