Erica ventricosa is easily cultivated, and is one of the few ericas that has been grown successfully in the summer rainfall areas of South Africa. It is an excellent pot subject, and a decorative garden subject where it is shown to best effect when planted in groups. It requires a sunny position, and well drained acidic soil with an ideal pH ranging between 5.5 and 6.7. A potting medium consisting of two parts acid river sand, two parts composted pine bark or well rotted compost and one part loam is recommended. This species produces numerous branches from its base, and regular pruning will enhance its good growth form and increase its flower production. It is not hardy to severe frost, but is unharmed by mild frost and should be hardy to zone 10 (-1°C / 30°F). Gardeners looking for a hardy erica suitable for pot culture cannot do better than try this lovely plant.

Weekly applications of organic seaweed-derived fertilizers have proved adequate for good balanced growth and flowering. Better growth may be achieved during the summer months by applying controlled release fertilizers that release nutrients gradually over a period of time. A small amount of 3.1.5 slow release fertilizer applied during spring has given good results in trials in the nursery. Too much nitrogenous fertilizer will, however, result in too much foliage growth and possibly limit flowering.

Erica ventricosa is easily propagated from seed or cuttings. Seed should be sown in autumn, in trays. A suitable sowing medium consists of two parts acidic river sand: two parts composted pine bark: one part loam. Seed is sown evenly over the surface of the soil medium and lightly covered. Do not cover too deeply. Seed that has been treated with the "Instant Smoke Plus" seed primer show greatly improved germination. Place the seed tray in a protected position, where the light conditions are good and ventilation is free. It is best to water gently overhead with a spray can to avoid washing the seed out of the tray. Seedlings usually appear from four to six weeks and are very delicate in this early stage. Water gently with a spray can and do not allow the medium to dry out. One can also place a glass pane over the tray and gradually remove it as the seedlings grow. Fungal problems can be arrested by prompt treatment with a fungicide designated for the control of damping-off. Seedlings may be planted into individual pots or bags when they have grown to a height of at least 1-cm, but only planted out into the garden when they are at least 10cm tall.

Cuttings are normally taken in autumn using proper rooting facilities, which are unfortunately not available to most amateur growers. These include overhead misting and heating from below. Placing cuttings in a container covered with plastic seldom works, as erica cuttings require free air-circulation. Fresh actively growing thin shoots taken as heel cuttings and treated with rooting hormone for semi-hardwood cuttings give best results. Roots may develop after eight weeks and are fine and delicate. Rooted cuttings must be hardened off away from the mist unit for a few weeks before they are planted out.

The young plants, both seedlings and newly rooted cuttings, should be kept moist, as they are more susceptible to drying out. Older plants are watered every second or third day depending upon the soil moisture content. Water well so that the water filters down to the roots in garden situations or drains out of the bottom of the container.