Aloe Vera

Aloe vera grows as a stemless rosette of 12-16 lanceolate leaves that are 12-20 inches (30-50 cm) long. Water-storing parenchyma, the clear gel in the inner part of the leaves, accumulates a moisture reserve for the succulent's survival in the arid climate of Arabia. A dense waxy coating protects the leaves from evaporation, while aloin, a bitter yellow sap under the skin, prevents them from being eaten by animals. Tubular yellow flowers on a tall flower stalk up to 36 inches (90 cm) high attract desert pollinators, but aloe blooms extremely rarely at home.

Aloe vera is native to the arid regions in the south and southeast of the Arabian Peninsula (specifically the Hajar Mountains in Oman and parts of Yemen). In the wild, the succulent grows on dry, rocky slopes and screes, enduring extreme heat and sparse rainfall. This natural environment has shaped a shallow root system adapted to quickly absorb rainwater running off rocks. Such conditions explain the necessity of bright light and fast-draining soil in home cultivation: the plant's roots are physiologically unprotected against constant wetness and quickly rot without access to air.

The healing properties of aloe vera have been known since antiquity: they were described in the Egyptian Ebers Papyrus (circa 1550 BC) and in the works of the Greek physician Dioscorides (1st century AD). Cultivation of the plant began in the Nile Valley and the Mediterranean, and in the 19th century, its plantations appeared in Europe and the USA. Carl Linnaeus described this succulent in 1753 as a variety of Aloe perfoliata, and in 1768, Nicolaas Burman elevated it to a distinct species under its current name. In the same year, Philip Miller described the plant as Aloe barbadensis, named after its mass cultivation in Barbados. Today, aloe vera remains a popular raw material for healing gels and cosmetics.

Provide bright indirect light. Direct sun is acceptable in the morning hours only. Avoid leaving the plant under harsh midday summer sun, otherwise the leaves may develop dry brown sunburn spots. Although aloe vera tolerates short periods in the shade, do not keep it without sun for more than 2-3 weeks: a lack of light causes the shoots to stretch, pale, and become limp.

Water the plant thoroughly only after the soil dries out completely. In spring and summer, check its moisture level once every 1-2 weeks, and in fall and winter, reduce checks to once every 3-4 weeks. Because aloe leaves store large reserves of moisture, the plant easily tolerates drought, whereas constant moisture around the roots is fatal. Use the bottom watering method: pour water into the saucer or a deep container and place the pot in it for 15-20 minutes until the substrate is completely saturated. If water remains in the saucer, make sure to drain it after watering. This method is preferred because it prevents water from entering the center of the rosette, which is dangerous for the plant.

Maintain a low humidity level for aloe vera, within 30-50% relative humidity. If the humidity level rises above 60%, the risk of leaf rot and leaf spot increases. Do not mist the plant: water accumulating on the fleshy leaves invites rot. Do not keep aloe in damp rooms, such as a bathroom, and avoid placing it too close to other plants to prevent stagnant air around the rosette. At signs of overwatering, reduce watering and improve air circulation: good ventilation not only speeds up soil drying but also prevents fungal diseases.

Warm-loving. In summer, maintain the temperature at 68-82°F (+20-+28°C). In winter, during the dormancy period, aloe prefers cool temperatures of 54-59°F (+12-+15°C) but easily tolerates normal room temperature. The minimum safe temperature is 50°F (+10°C), so in winter, protect the aloe from freezing drafts during ventilation and make sure the leaves do not touch the icy window glass. Also, place the pot away from radiators so the leaves do not lose moisture too quickly from the dry heat.

Use loose, fast-draining soil. When using a commercial mix, choose a cactus or succulent substrate and mix it with amendments (coarse sand, perlite, or fine bark) in a 2:1 ratio. If you prepare the mix yourself, mix universal potting soil with the amendments in a 1:1 ratio. To improve drainage, you can place coarse sand, expanded clay, or pebbles at the bottom of the pot. If you want to save the entire pot volume for root growth, skip the drainage layer and simply increase the proportion of amendments in the substrate itself. Every few weeks, gently loosen the very top layer of the soil, taking care not to disturb the shallow roots: soil compaction restricts access to air and water, causing rot.

Use heavy clay or terracotta pots with drainage holes. The weight of such pots balances the rosette, while the porous walls speed up soil drying between waterings. Choose a snug pot: in an oversized one, aloe will grow roots at the expense of leaf development. Slight root restriction also stimulates the mature plant to bloom.

Feed aloe monthly in spring and summer with a specialized cactus and succulent fertilizer or a formula with NPK 10-40-10. Always dilute the product to half-strength. Before applying the fertilizer, slightly moisten the soil to prevent chemical burns to the sensitive roots. Stop fertilizing in fall and winter: during this period, the plant is dormant. Avoid excess nitrogen in fertilizers: it causes soft leaves and reduces disease resistance.

Repot young plants under 3 years old annually in spring or early summer. Repot fully grown plants every 2-3 years or as the root system expands. Signs that indicate an unscheduled repotting include roots growing through the drainage holes, a complete stop in growth, or soil drying out too quickly. When repotting, do not bury the rosette deeper than its previous level: the leaf bases must remain strictly at soil level to prevent stem rot.

Pruning is not required. Remove only damaged or old lower leaves at the base of the plant using a clean blade, without leaving stubs. When pruning, keep in mind that aloe sap contains aloin, which can cause skin irritation or an allergic reaction upon contact. To protect yourself, wear gloves, and thoroughly wash your hands and clean the tool after the procedure.

Propagate aloe vera by separating basal offsets during spring repotting. Choose healthy, strong pups that have reached about one-fifth of the parent plant's size and already have their own roots. After separation, dry the offset's cut for 1-2 days in the shade to let a dry protective scab (callus) form and prevent rot. Plant young specimens in a loose substrate amended with perlite or sand. Do not water the succulent for the first 2-3 days after planting, allowing the damaged roots to adapt in dry soil.

The thick leaves form a rigid, self-supporting rosette that does not require staking.

Root rot due to excess moisture is the main cause of death. The first signs are yellowing and softening of the leaves, as well as a musty odor from the soil. To prevent rot, do not allow water to stand in the saucer and always check the soil moisture before watering, letting it dry out at least 1.2-2 inches (3-5 cm). Also, avoid planting in pots without drainage holes or in heavy clay soil without perlite. If rot is detected, remove the aloe, cut away darkened soft roots, sprinkle the cuts with crushed charcoal, and in case of severe rot, treat with a fungicide. Dry the plant for 1-2 days and repot it in dry substrate.

Dry brown or whitish spots appear on the leaves under direct midday sun, especially if the plant was suddenly moved to bright light. To avoid sunburn, acclimate the aloe to bright light in stages: first shade it with a light curtain or expose it to the sun for 1-2 hours a day, increasing the time gradually over 7-10 days. The resulting spots will not disappear, but new leaves will grow healthy.

Mealybugs and scale insects can infest the plant in dry or stagnant air. Regularly ventilate the room to prevent pest infestations. If detected, remove the pests with a cotton swab dipped in alcohol, and then treat the aloe with insecticidal soap.