Leucospermum lineare can be propagated from cuttings or seed; both methods are successful. This is one of the fastest flowering Leucospermum species, and if plants are thriving they can flower in their second year of growth.

Take cuttings from December to March (summer to autumn). The cuttings should be semi-hardwood, 60-100 mm long, and taken from the current season's growth. Dip the cuttings into a rooting hormone solution or powder and plant into a medium of 50% polystyrene and 50% finely milled pine bark. Place in a growing house with bottom heat (25ºC) and intermittent mist. Once the roots are well developed, remove from the mist unit and harden off for three weeks. Plant the cuttings into small bags and grow on until ready to plant into the garden.

Sow seed at the end of February when the days are warm and the nights start to cool down (late summer to autumn). Soak seed in smoke water to which hydrogen peroxide has been added at the ratio of 1% of the total volume, for 24 hours. This loosens the outer seed coat and oxygenates the seed. After soaking, rub off the softened seed coat. Dust the seed with a systemic fungicide. Sow on a well-draining medium, firm down and cover with a layer of sand. Seed can be sown in an open seedbed, or in a seedtray placed in a sunny position. Germination begins after three to four weeks. Once two true leaves have sprouted, prick the seedlings out into small pots. The seedlings will have to be pricked out in batches, as the seeds germinate at different times. Place the seedlings in a lightly shaded area with good air circulation. When plants are ± 50-100 mm tall or after one year's growth, they can be planted into the garden. Nipping out the tips will encourage branching and produce a neater shrub.

Plant out into the garden at the start of the rainy season. This enables plants to establish themselves and send down deep roots before the hot, dry summer season. Granite soils are richer in nutrients than sandstone soils, so incorporate a good amount of well rotted compost at planting. Feed with an organic fertilizer low in phosphates (for example 5:1:5) twice a year in spring and autumn. Ensure that the soil stays cool and retains moisture in the hot months by using a thick layer of mulch or groundcover planting.

Pests are not too much of a problem, but if air flow and circulation are not sufficient, mealy bug and scale may appear. Improve exposure to wind/air flow and treat with an appropriate insecticide or biological control.

Phytopthora is a soil-borne fungus that affects most members of the protea family. Stems wilt and plants turn brown very quickly. Unfortunately, by the time plants show signs of this disease, it is too late and it is best to remove them to stop the infection spreading.