Olearia

If you’re in an area with moderate rainfall, the tree daisy will not require additional water. In drier climates, the soil should be kept evenly moist. When watering, take care to direct the stream at the soil and avoid the leaves, as wetting the foliage could cause leaf spot disease. Check the soil frequently, and if it dries out, water deeply.

Tree daisies prefer full sun but can tolerate partial shade. While a well-lit location will bring out its vivid leaf coloration and prolific flowering, too much sunlight for extended periods may cause damage. For best health, provide a location where the plant is able to receive direct sunlight for part of the day, but shade for some in the afternoon.

Tree daisy plants thrive in temperatures between 45–85°F (7–30°C). In cooler climates, it can be grown in a large pot indoors and moved outside during the warmer months.

Tree daisies appreciate an occasional misting to prevent dryness, but in general prefer drier air. Keep relative humidity levels between 40–60% for best health.

Tree daisy plants prefer a slightly acidic potting mix with a pH between 5 and 6.5. Choose a potting mix that drains well, and add either peat or chopped bark to make it more suitable for this plant. It’s also a good idea to add some slow-release fertilizer to ensure that the soil is adequately enriched.

Fertilize the tree daisy only between late spring and early fall. Make sure to use a balanced, water-soluble fertilizer diluted to the recommended strength of the product and applied to wet soil. This should be done every four to six weeks, as the plant will take up nutrients during its growing period.

Tree daisy plants are generally quite resistant to pests, but spider mites and whiteflies sometimes find their way to them. If noticed, treat with insecticidal soap or neem oil to prevent further infestation. In addition, keep an eye out for mealybugs and scale which might seek shelter on the plant. Remove any affected pest-ridden leaves, and use a horticultural oil or insecticide to prevent further damage.

Tree daisies don’t require regular repotting. If the growth is becoming too congested, prune back the roots and repot into a larger container every few years. If the plant is large enough, it can be planted directly into a larger pot. When repotting, ensure that you use a potting mix specifically designed for houseplants and that it has good drainage.

Tree daisies require little pruning. If desired, they can be shortened and shaped in spring, while removing any dead, damaged or unattractive stems, as well as any flower heads to encourage bushier growth. If being kept as a bonsai, trim and prune as necessary.

Mulch is not recommended for tree daisies. Instead, make sure the soil is well-draining and lightly water the soil as necessary.

Tree daisies can be propagated through seeds or cuttings. To collect and propagate the seeds, wait until the flowers open and become fully mature. This will take about three months. Then, gently collect the seeds and place them in a warm, sunny spot for germination. Cuttings taken during the growing season tend to fare better when propagated in a rooting hormone.

Tree daisies have quite thick stems that allow them to keep their shapes but become bendy with age. Consider using a thin, unobtrusive stake to support the form and keep it from becoming too leggy or drooping over.

Tree daisies require no rest period or special care in winter. Keep the plant warm and away from draughts, and reduce watering and fertilizing during this period.

Tree daisies are not toxic to pets, however, as with all houseplants, it's best to keep animals away for their own safety.