Aloe rupestris Baker
Aloe rupestris is a large, fast-growing succulent with an unbranched trunk on top of which sits a rosette of thick, fleshy, blue-grey leaves with red-brown spines along the margins. It grows up to 26.2 feet (8 m) tall. As the leaves die, they remain attached to the trunk. They can be removed or left attached, giving the trunk a shaggy look. In spring and summer, a huge, branched flowering stem is produced. There can be up to 12 spikes, each with a terminal raceme of yellow buds opening into wonderfully brilliant, tubular, orange to red flowers.
USDA hardiness zones 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C).
How to Grow and Care
Aloe is a very forgiving plant, and a well-grown plant can be quite beautiful. As with all succulents, Aloe must never be allowed to sit in stagnant water, and the plant should be carefully monitored to watch for signs of overwatering.
These succulents are not particularly fast-growing and will only rarely need repotting. In the spring, repot Aloes that are tipping over their pots or have ceased growing. A well-drained potting mix is essential. Use a potting mix for cacti or succulents. During repotting of a larger plant, it is possible to carefully divide the root ball. Some varieties of Aloe will send off offsets that can be potted independently.
Aloe plants need strong, bright light. They can withstand full summer sun once acclimated. In the winter, provide bright light. These plants prefer warmer temperatures of 70 to 80 °F (21 to 27 °C) but will survive down to 40 °F (4.5 °C). Feed with a fertilizer for cacti and other succulents in spring and summer only.
Learn more at How to Grow and Care for Aloe.
Aloe rupestris is native to summer-rainfall areas of southern Africa.
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