Aloe suprafoliata
| Light | Bright light to full sun; morning sun with some afternoon shade in the hottest climates |
|---|---|
| Water | Regularly in the growing season, letting the soil dry between waterings; keep dry and cool in winter |
| Soil | Gritty, fast-draining mix (see Soil and potting mix) |
| Temperature | Hardy to light frost once established; broadly USDA zones 9a–11 |
| Propagation | Seed (primary); occasionally by removing offsets from clustering plants |
| Toxicity | Generally regarded as low-toxicity, but best kept away from pets that chew foliage |
Aloe suprafoliata is a small to medium, usually solitary aloe from the summer-rainfall grasslands of southern Africa, best known for the striking way its young leaves are arranged. For its first few years the plant holds its blue-grey, powdery leaves in a single flat plane — two neat opposing ranks that fan open like the pages of a book, earning it the common name book aloe. As the plant matures the leaf arrangement twists into a more conventional spiral rosette, but the distinctive juvenile "fan" is what makes it a prized collector's plant.
Description
Aloe suprafoliata is a mostly solitary, stemless or short-stemmed aloe that in age forms a dense rosette of up to about thirty lance-shaped leaves, each reaching roughly 30–40 cm long. The leaves are broad at the base and taper to a point, coated in a waxy blue-grey to glaucous bloom that can flush purplish or bronze under strong light and cool, dry conditions. Leaf margins carry firm reddish-brown teeth.
The most remarkable feature is developmental: young plants arrange their leaves distichously — in two opposite ranks lying in a single plane — so the whole plant reads as a flattened fan. This two-ranked "book" habit gradually gives way, with maturity, to the spiralled rosette typical of the genus; plants may flower while the leaves are still two-ranked, an unusual trait in the genus.
In autumn and winter, established plants send up a tall, usually unbranched inflorescence bearing a dense, tapering raceme of tubular flowers that are rose-pink to scarlet and greenish at the mouth; the buds are often tipped slate- or purplish-grey, giving the spike a two-toned look while in bloom.
Distribution and habitat
The species grows in summer-rainfall grassland and on rocky slopes and cliffs of the escarpment region of eastern South Africa (notably Mpumalanga, around Barberton, and northern KwaZulu-Natal) and neighbouring Eswatini, extending marginally into Mozambique. Plants root among rocks and grasses in cool, higher-lying montane sites, often near summits, where they experience warm wet summers and cold, dry winters — conditions that can include frost. This background makes A. suprafoliata more cold-tolerant than many aloes once it is established and kept dry in winter. It is assessed as Least Concern on the Red List of South African Plants.
Cultivation
Aloe suprafoliata is an accommodating grower given sharp drainage and plenty of light. Plant it in a gritty, free-draining mix and give it bright light or full sun; strong light both intensifies the blue-grey colouring and helps hold the tidy juvenile fan for longer, whereas too little light stretches the leaves and blurs the effect. Water regularly through the warm growing season, always letting the mix dry out before watering again, and keep the plant largely dry through winter. That winter dry rest, combined with cooler temperatures, is what encourages flowering and prevents rot. Because the species tolerates a touch of frost when dry, it can be grown outdoors year-round in mild-winter climates; elsewhere it makes an easy container plant that can summer outside. See Watering and Repotting for general technique.
Propagation
Seed is the main and most reliable method, and seed-raised plants show the fan-leaved juvenile stage to best effect; sow onto a warm, gritty surface and keep lightly moist until germination (see Propagation — seed). The species is usually solitary, but plants that do produce offsets or suckers can be increased vegetatively by detaching and rooting the pups (see Propagation — offsets).
Common problems
- Rot — the usual cause of loss, almost always from overwatering, a poorly draining mix, or wet feet through the cold season.
- Loss of the fan / etiolation — insufficient light causes the leaves to stretch and the plant to lose its compact, two-ranked shape and blue colour prematurely.
- Pests — mealybugs (white fluff in the leaf axils and roots) and scale are the most common; watch also for aloe mite, which distorts growth. See Pests and diseases.
See also
- Aloe — the genus overview
- Soil and potting mix · Watering · Repotting · Propagation — seed · Propagation — offsets · Pests and diseases