Soap aloe

Sun

Full sun to light shade; afternoon shade helps prevent scorching in very hot inland gardens.

Water

Low once established. Water deeply, then let the soil dry; keep nearly dry during cold weather.

Soil

Sharply drained sandy or gravelly soil. In containers, use a gritty cactus and succulent mix and a pot with drainage holes.

Height

1-2 ft (0.3-0.6 m) in leaf; flower stems reach 2-3 ft (0.6-0.9 m)

Spread

1-2 ft (0.3-0.6 m) per rosette; colonies can spread considerably farther

Flowers

Orange, coral-red or occasionally yellow tubular flowers in broad, nearly flat-topped clusters; flowering can fall between late winter and summer, depending on climate and plant.

Foliage

Evergreen. Broad, fleshy green leaves marked with pale spots and edged with sharp brown teeth; strong sun or drought may turn the leaves reddish.

Growth

Moderate in warm weather; spreads steadily by offsets

Care needed

Low

• Pollinators
• Drought tolerant
• Heat tolerant
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Very tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   0.8 ft (0.25 m)

2. After 1 year

   0.9 ft (0.28 m)

3. After 2 years

   1 ft (0.32 m)

4. After 3 years

   1.1 ft (0.35 m)

5. After 5 years

   1.4 ft (0.42 m)

About 6 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Toxic

Invasive in

Australia

In the garden

Spreads vigorously: plan to contain it.

Growth rate

Moderate

• Plant with the crown above the surrounding soil and provide sharp drainage.
• Water new plants when the soil dries; reduce watering once roots are established.
• Keep mulch and fallen leaves away from the crown; use gravel rather than moisture-holding organic mulch.
• Feed container plants lightly with a dilute cactus fertiliser in spring; established garden plants usually need none.
• Remove unwanted offsets before the colony crowds neighbouring plants.
• Move pots under cover before frost in cold-winter regions and keep them bright, cool and nearly dry.

Pruning. Cut spent flower stems close to their base after flowering. Remove fully dead leaves with gloves and clean tools, but leave healthy foliage intact.

Spring

Plant or repot once frost risk has passed, using a sharply drained soil or potting mix.

Late spring

Separate unwanted offsets and allow cut surfaces to dry before potting them.

Summer

Water only after the root zone dries; check container plants more often during heat.

After flowering

Remove spent flower stems unless you want to collect seed.

Autumn

Reduce watering as temperatures fall and move tender pots into frost-free shelter.

Winter

Keep sheltered plants in bright light and check for crown rot and mealybugs.

• Repeat small groups through gravel beds for spotted foliage and seasonal flower spikes.
• Combine with agaves and low succulents in dry, architectural planting.
• Use in broad containers on sunny patios where winter shelter is available.
• Plant on well-drained banks in frost-mild gardens to form a low colony, away from paths because of the toothed leaves.

Garden styles it suits: Desert / xeriscape, Dry gravel garden, Modern Mediterranean, Desert modern, Architectural minimal and Coastal.

Plant it with: Blue chalk sticks, Foxtail agave, Rock purslane, Trailing ice plant and Lavender.

Wildlife: Flowers supply nectar to bees and nectar-feeding birds, including hummingbirds where they occur.

• Root or crown rot in wet soil: improve drainage, stop frequent watering and discard badly rotted plants; save healthy offsets if possible.
• Mealybugs in leaf bases or roots: isolate affected pots, remove visible insects and use a locally approved treatment labelled for succulents.
• Frost damage: shelter containers before freezing weather; keep damaged plants dry and remove collapsed tissue once the extent of injury is clear.
• Sun scorch after moving outdoors: introduce plants to direct sun gradually over one to two weeks.

Do not eat the leaves or use this species as a substitute for medicinal aloe. The bitter yellow leaf sap can cause digestive upset if swallowed and may irritate skin. Aloes are considered toxic to cats, dogs and horses; species-specific evidence for soap aloe is limited, so keep it out of reach and seek veterinary advice after ingestion. Leaf teeth can also injure people and animals.

Where it spreads. Spreads by offsets and can escape gardens. It is recorded as an environmental weed in parts of coastal New South Wales and Queensland, Australia, and is naturalised in parts of Mediterranean Europe, including Spain and Portugal. Do not dump offsets or garden waste in bushland or coastal vegetation.

• Bitter aloe (Aloe grandidentata)

  Also forms spotted, offsetting rosettes, but usually has smaller, narrower leaves and more elongated flower clusters rather than soap aloe's broad, nearly flat-topped heads.

• Aloe vera (Aloe vera)

  Mature plants usually have longer, thicker, mostly unspotted grey-green leaves and elongated yellow flower clusters; young plants may be spotted.

The epithet maculata means spotted, referring to the leaves, while soap aloe refers to the traditional use of its leaf sap as a soap substitute.

Propagation. Detach rooted offsets in spring or early summer with a clean knife. Let any cut surfaces dry and seal for several days, then plant in gritty mix and water sparingly until established. Seed is another option, but seedlings may vary where other aloes grow nearby.

Accepted botanical name

Aloe maculata

Native range

Cape Provinces, Free State, KwaZulu-Natal, Lesotho and Northern Provinces.

Sources: GBIF (CC BY 4.0) and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.