How to grow aloe vera
Overview
Aloe vera is a succulent herb from the Asphodelaceae family, grown for its thick, fleshy leaves that store water and contain a clear gel used topically. It is a low-maintenance plant that thrives in bright, indirect light and requires very little water once established.
Varieties
- Aloe vera 'Barbadensis Miller' — The classic medicinal variety with large, thick leaves and high gel content, widely available in Australian nurseries.
- Aloe vera 'Variegata' — A compact, slow-growing form with white-striped leaves, ideal for small pots and indoor windowsills.
Soil Preparation
Aloe vera requires a very free-draining soil with a pH between 6.0 and 7.5. Mix one part coarse sand or perlite with two parts commercial succulent or cactus mix, or use a blend of sharp sand, pumice, and a small amount of compost. Ensure the pot or bed has excellent drainage; adding a layer of gravel at the base of the pot helps prevent waterlogging.
Growing Guide
Plant Aloe vera in a position that receives morning sun and afternoon shade, especially in hotter climates. Use a free-draining mix of coarse sand, perlite, or pumice with a small amount of organic matter; avoid heavy clay or potting mix that holds moisture. Space plants 30–50 cm apart to allow for clumping offsets. Water only when the top 5 cm of soil is dry, and never let the pot sit in a saucer of water. In cooler zones, grow in a container that can be moved indoors during frost.
Care
Feed aloe vera once in spring and once in summer with a balanced liquid fertiliser diluted to half strength. Remove spent flower stalks after blooming and trim any damaged or yellowing lower leaves to keep the plant tidy. Repot every 2–3 years if the plant becomes rootbound, using a slightly larger pot with fresh succulent mix.
Companion Planting
Aloe vera pairs well with other succulents like Echeveria, Sedum, and Agave, as well as with cacti in dry beds. Avoid planting near moisture-loving plants such as ferns, mint, or impatiens, which can lead to root rot in the aloe.
Common Pests & Risks
Scale and mealybug can appear on aloe vera, especially in humid conditions; treat with a cotton swab dipped in isopropyl alcohol or a neem oil spray. Root rot is the most common disease, caused by overwatering or poor drainage; always use a pot with drainage holes and water sparingly.
Harvesting
Harvest aloe vera leaves when they are at least 20 cm long and plump, usually from the outer ring of the plant. Cut a leaf near the base with a clean knife, then let the yellow sap (aloin) drain for a few minutes before using the clear gel. Leaves can be stored in the refrigerator for up to a week, but the gel is best used fresh.
Troubleshooting
Yellow leaves: caused by overwatering or poor drainage; let soil dry out completely and check pot drainage. Brown leaf tips: caused by too much direct sun or low humidity; move to a spot with morning sun only. Soft, mushy leaves: sign of root rot from overwatering; remove affected leaves and repot in dry mix. Leaves curling inward: indicates underwatering or heat stress; water deeply and provide shade. White spots on leaves: usually from sunburn or fungal spots; avoid wetting leaves in direct sun.