For optimum growth, Erica walkeria needs a well-ventilated, sunny area with well-drained, sandy, acidic soil. Spread mulch over the soil and feed it once or twice a year with well-rotted compost. It is also possible to use slow-release fertilizer in very small or diluted doses. Pinching the tips of young plants results in a plant with more branches, a more compact habit, and more blooms. If properly hydrated, it can also be utilized in containers.

You may grow Erica walkeria from seeds or cuttings. Sow seeds in autumn (April to May). To enhance germination, treat the seeds with Instant Smoke Plus Seed Primer, a smoke-water mixture, or expose the seed trays to burning fynbos plant smoke (in a tent). An acidic, well-drained sowing medium is essential. Because the seeds are so small, they only require a thin layer of clean sand to cover them. Alternatively, the seeds can be mixed with dry sand and distributed in a thin layer on top of the sowing media. The trays must be kept out of direct sunlight, moist but not wet, in a warm but not hot place, and watered with a fine rose to prevent disturbing the seeds. One to two months are needed for germination, and seedlings need to be transplanted when they are around 10 mm tall.

Take semi-hardwood tip or heel cuttings that are 50–70 mm long in spring, late summer, or autumn. Place in a sterile rooting medium that is well-drained, well-aerated, and well-ventilated after applying rooting hormone. A root-stimulating hormone, such as auxin powder or IBA, is recommended. Cuttings are trimmed of any visible flower parts before being treated in a seaweed extract solution and watered. The cuttings are planted in a substrate that is favourable to fynbos (such as a mixture of fine-milled bark and perlite). The surplus powder is allowed to stay on the cutting where it will be inserted in the wet medium by first creating a small hole with a sterile wire and then inserting the cutting into the hole. Before being placed in the propagation mist house, the cuttings tray is labelled.

The mist house is heated and kept at a comfortable temperature of 22–25°C; it sprays water for 5 seconds every 15 minutes to keep the leaves cool and moist and the rooting medium moist. Additionally heated, the bench is kept at a cosy 22–25°C temperature. After two to three months, the cuttings are potted into 2 kg nursery bags with a fynbos soil mixture after being hardened off for a week in a shaded area. When they are ready, they are planted in the garden after receiving regular irrigation and a monthly application of organic fertilisers to encourage development.

Erica walkeria prefers sandy, acidic soil in a sunny area with sufficient air circulation. It is ideal for fynbos gardens, especially those on hot, sandy flats in the summer. It enjoys settings that are warm, bright, and well-ventilated and needs regular watering during the summer. Pincushions, proteas, ericas, buchus, and restios are recommended companion plants.