Aloe vera (Aloe vera, (L.) Burm.f. 1768)

Identity

Aloe vera (Aloe vera) is a perennial succulent in the Asphodelaceae, accepted under that name by POWO. People have grown it for a very long time, which is why so many names still travel with it, true aloe and Barbados aloe among them. ^{1 2}

Two points matter most. It is not a cactus, and its leaf is more than the clear gel. The skin, the yellow latex and the inner gel serve different purposes and carry different levels of risk. ^{3 4}

Recognition

Thick, fleshy, lance-shaped leaves with slightly toothed margins make up the rosette of Aloe vera. A healthy plant looks firm: its leaves stand upright or arch outward and hold water, nothing like the thin foliage of a tropical houseplant. ^{5 6}

Side offsets are a good sign of maturity. The flower stalk, yellow to orange depending on the source and the plant, appears mostly on adult specimens grown in strong light and spared from overwatering. ^{4 6}

Useful taxonomy

Catalogs still use Aloe barbadensis widely, yet the accepted name is Aloe vera. Labels such as barbadensis, chinensis or variegata are best treated as common or trade names that need checking. ^{1 7}

• Aloe barbadensis Mill.
• Aloe perfoliata var. vera L.
• Aloe indica Royle
• Aloe vulgaris Lam.

The costliest confusion is a practical one: many aloes share the same rosette shape, but not all of them can be treated as a household source of gel. ¹

Habitat and range

Pinning its origin to a single country is hard, because the species has been cultivated for so long. Sources agree on hot, dry regions and record many naturalized populations in arid or garden settings. ^{1 5}

That ecology sets the core of its care: strong light, a pot with drainage holes, a mineral mix and infrequent but thorough watering. The plant handles drought well; it copes poorly with cold, wet conditions and roots left sitting in water. ^{6 4} Outdoors, that points to a frost-free climate, roughly USDA zones 10 to 12; where winters bring frost, it is grown in a pot and brought indoors for the cold months.

Life cycle and reproduction

Growth is slow, first as a single rosette, then through offsets. Indoors, a plant can go years without flowering, and that is no failure as long as the leaves stay firm and the base does not rot. ^{5 6}

The reliable way to propagate it is to separate offsets that already have roots. Leaf pieces are not a dependable method here, unlike some succulents that root from a single leaf. ⁶

Uses and risks

Most of its known use centers on the inner gel, mainly in cosmetic or traditional settings. That use has to be kept separate from the yellow latex and from preparations taken by mouth, since one leaf holds very different fractions. ^{4 6}

The ASPCA lists aloe as toxic to cats, dogs and horses. The risk to animals comes mainly from the saponins and anthraquinones in the latex, which can cause vomiting, diarrhea or lethargy. ⁸

Varieties, look-alikes and related plants

Plants sold as Aloe vera variegata, Aloe vera chinensis or Barbados aloe should be checked by habit, leaf and botanical label. For growing, the right purchase is mainly a firm, well-rooted plant with no soft base. ^{6 5}

Common look-alikes include:

• Aloe arborescens, shrubby, with more leaves carried on stems
• Haworthiopsis attenuata, a small striped rosette, not used as a medicinal aloe
• Agave americana, a stiffer rosette, usually monocarpic

Before using a leaf, confirm the species, the plant's health and exactly which part is being taken. ²

What to check

Start with the base of the plant, not the leaf tips. A firm, pale, well-ventilated base beats a deep green rosette sitting in dense potting soil. The mix should dry out between waterings; if the pot stays heavy for several days, the cause usually lies with the container, the mix or a spot that is too cold. ⁶

The leaves also show how well the plant is growing:

• thick, taut leaves: water reserves are fine;
• flat, long or soft leaves: too little light, too much water or weakened roots;
• dry patches after a summer outdoors: direct sun came on too fast;
• offsets crowded around the base: the plant is mature enough for a clean division.

At home, the cautious rule is to keep the ornamental plant, the inner gel and the yellow latex distinct. Repeated harvesting weakens a small rosette, and swallowing the latex puts pets and children at greater risk than simply touching an intact leaf. The ASPCA places aloe among plants to keep out of reach of cats, dogs and horses, so the sensible move is a high, stable spot where the pot cannot be chewed. ^{8 1}

Main sources

• Plants of the World Online / Kew, Aloe vera
• International Plant Names Index, Aloe vera
• GBIF Backbone Taxonomy, Aloe vera
• Wikidata, Aloe vera
• French Wikipedia, Aloès
• Wikipedia, Aloe vera
• NC State Extension, Aloe vera
• ASPCA, Aloe toxicity entry