Asphodelaceae
Black Gem Aloe: Low Water Needs
Alworthia 'Black Gem'
A hardy, slow-growing hybrid that thrives on neglect. Give it bright light, a gritty well-draining mix, and let the soil dry out completely between waterings. Protect from hard frost and keep out of reach of pets, as the sap contains mildly irritating saponins.
Every 14 days
Bright indirect
10° - 32°C
20% - 40%
Categories
What is Black Gem Aloe?
Black Gem Aloe (Alworthia 'Black Gem') is a easy-care plant from the Asphodelaceae family. Alworthia 'Black Gem' is a striking bigeneric succulent hybrid, a cross between Aloe speciosa and Haworthia cymbiformis, placing it in the Asphodelaceae family alongside both parents. It forms a compact, stemless rosette of thick, fleshy, triangular leaves that deepen from dark green to bronze or re...
Black Gem Aloe grows up to 20cm, spread of 20cm, watering every 14 days, 10°C â 32°C, 20â40% humidity. It is suitable for indoor environments and not safe for pets.
Unlike many tropical plants, Black Gem Aloe tolerates watering mistakes. Best for beginners. Without precautions, ingestion can cause irritation in pets. Keep out of reach of cats and dogs. Without adequate drainage, root rot can develop within 28 days.
How to Care for Black Gem Aloe?
TLDR: Black Gem Aloe needs Bright indirect, watering every 14 days, and temperatures between 10-32°C with 20-40% humidity.
How Often Should You Water Black Gem Aloe?
Use the soak-and-dry method: water thoroughly until it drains from the pot, then wait until the soil is completely dry before watering again, roughly every 2-3 weeks in spring and summer and only monthly or less in fall and winter. Overwatering is the single biggest risk to this plant.
How Much Light Does Black Gem Aloe Need?
Give it bright light, ideally a south- or west-facing window, or full sun outdoors once acclimated. More light brings out the deeper bronze-red leaf color; low light causes the rosette to stretch and lose color. Introduce strong direct sun gradually to avoid scorching.
What Is the Best Soil for Black Gem Aloe?
Plant in a well-draining cactus/succulent mix amended with 50-70% mineral grit such as coarse sand, pumice, or perlite, and always use a pot with drainage holes.
What Pot Should You Use for Black Gem Aloe?
An unglazed terracotta or clay pot with a drainage hole is ideal - the porous material wicks away excess moisture and helps prevent root rot in this drought-tolerant hybrid.
Care Schedule
Fertilize
Every 60 days
Rotate
Every 30 days
Repot
Every 365 days
What Is Black Gem Aloe and Where Does It Come From?
Alworthia 'Black Gem' is a striking bigeneric succulent hybrid, a cross between Aloe speciosa and Haworthia cymbiformis, placing it in the Asphodelaceae family alongside both parents. It forms a compact, stemless rosette of thick, fleshy, triangular leaves that deepen from dark green to bronze or reddish-purple under strong light, with pale tubercles scattered across the upper leaf surface for a jewel-like, textured look. Slow-growing and clump-forming, mature plants readily produce offsets around the base, eventually forming dense clusters. Flowering is uncommon in cultivation but when it occurs, slender stalks carry small tubular blooms in late spring to summer. Hardy, compact and easy to care for, it is a popular choice for windowsills and succulent collections alike.
How to Propagate Black Gem Aloe?
How Big Does Black Gem Aloe Grow?
TLDR: Black Gem Aloe can reach up to 20cm tall with Slow growth rate.
Max height
20cm
Spread
20cm
Growth rate
Slow
Foliage
Evergreen
Warning: Toxic Plant
This plant can be toxic if ingested. Keep out of reach of:
Plant Uses
Ornamental
Great for decoration
Is your plant showing symptoms?
Click on the symptom to discover possible causes:
What Diseases Commonly Affect Black Gem Aloe?
TLDR: Black Gem Aloe is susceptible to 6 known diseases. Monitor regularly for early detection.
Root Rot
Root rot is a serious fungal disease that affects the root system of plants, causing them to decay and die. It is primarily caused by overwatering, poor drainage, or soil-borne fungi such as Pythium, Phytophthora, Rhizoctonia, and Fusarium. The disease thrives in waterlogged conditions where roots are deprived of oxygen, making them susceptible to fungal infection.
Overwatering
Overwatering occurs when plants receive too much water, depriving roots of oxygen and causing root rot. This environmental stress is one of the most common causes of houseplant death, as waterlogged soil prevents roots from breathing and functioning properly.
Mealybugs
Mealybugs are small, soft-bodied insects covered with a white, waxy, cottony material. They are common pests of houseplants and outdoor plants in mild climates. These sap-sucking insects feed on plant tissue, causing damage, stunted growth, and can lead to plant death if left untreated. They produce sticky honeydew which attracts sooty mold.
Scale Insects
Scale insects are small sap-sucking pests that appear as brown, shell-like bumps on plant stems and leaves. There are over 25 species, divided into armored (hard) and unarmored (soft) scales. They feed by piercing plant tissue and extracting sap, which weakens the plant and can lead to yellowing, stunted growth, and even death if left untreated. They also excrete honeydew, which attracts ants and promotes sooty mold growth.
Meaning & Symbolism
Represents resilience and protection due to its hardy nature and dark, shielding colors.
Compare with similar plants
| Attribute | Difficulty | Light | Watering | Pet Safe |
|---|---|---|---|---|
| Field Maple | Easy | Bright indirect | 14d | â |
| Silver Birch | Easy | Direct sun | 14d | â |
| Common Blanketflower | Easy | Direct sun | 10d | â |
| Cushion Bush | Easy | Direct sun | 14d | â |
Choose & Compare
Sources & References
- X Alworthia Black Gem Care Guide - Succulents Network
- Alworthia pentagona Black Gem - Mountain Crest Gardens
- Hybrid Aloe Black Gem Plant Care - PlantIn
- The Complete Aloe Black Gem Plant Care Guide - Greg App
- Toxic and Non-toxic Plants: Aloe - ASPCA
- Aloe Pests and Diseases - Henry Shaw Cactus and Succulent Society