Sabrina Hahn, a renowned gardening expert, has shared her insights on tackling common garden challenges, including black onion aphids, dichondra, gardenias, and avocados. In her latest column for The West Australian, she provides practical advice for gardeners facing these issues.
Dealing with Black Onion Aphids
Black onion aphids can be a nuisance for gardeners, particularly those growing onions, garlic, and other alliums. Hahn recommends using a strong jet of water to dislodge the aphids from the plants. For severe infestations, she suggests applying an insecticidal soap or neem oil, ensuring thorough coverage of the affected areas. Encouraging natural predators like ladybugs and lacewings can also help keep aphid populations in check.
Dichondra Care Tips
Dichondra is a popular ground cover that thrives in warm climates. Hahn advises planting dichondra in well-drained soil and providing regular watering until established. It prefers full sun to partial shade and benefits from occasional feeding with a balanced fertiliser. To maintain a lush appearance, mow dichondra at a height of 2-3 inches and remove any weeds promptly.
Growing Healthy Gardenias
Gardenias are prized for their fragrant white flowers, but they can be finicky to grow. Hahn emphasises the importance of acidic soil with a pH between 5.0 and 6.5. She recommends mulching with organic matter to retain moisture and keep roots cool. Regular watering is crucial, especially during dry spells, but avoid waterlogging. Prune after flowering to shape the plant and remove dead wood.
Avocado Harvesting and Care
For avocado enthusiasts, Hahn provides guidance on harvesting and tree care. Avocados do not ripen on the tree; they should be picked when mature but still firm. To test maturity, pick one fruit and leave it at room temperature; if it ripens within a week, the rest are ready. Hahn also advises feeding avocado trees with a citrus and avocado fertiliser in spring and autumn, and watering deeply but infrequently to encourage deep root growth.
Hahn's expert advice is a valuable resource for both novice and experienced gardeners looking to enhance their green spaces. By following these tips, readers can effectively manage pests, nurture their plants, and enjoy a bountiful harvest.
