Golden Sedum (Sedum adolphi) is a striking succulent species in the family Crassulaceae, prized for its vibrant golden-yellow foliage and compact, trailing growth habit. Also commonly known as 'Golden Sedum' or 'Coppertone Stonecrop,' this species is a favorite among succulent enthusiasts and rock garden designers alike.
• Belongs to the genus Sedum, one of the largest genera of flowering plants with approximately 400–600 species
• Part of the Crassulaceae (stonecrop) family, known for their water-storing succulent tissues
• Widely cultivated as an ornamental plant for containers, hanging baskets, and ground cover
• Its brilliant golden to chartreuse leaves intensify in color when exposed to bright light or mild drought stress
Taxonomie
• Endemic to Mexico, though it has been introduced and naturalized in various warm regions worldwide
• Typically found growing on rocky outcrops, cliff faces, and well-drained slopes in its native range
• The genus Sedum has a broad global distribution across the Northern Hemisphere, with centers of diversity in Mexico, the Mediterranean, and East Asia
• Mexico is recognized as a major center of diversity for the genus, hosting numerous endemic Sedum species
The Crassulaceae family has a long evolutionary history:
• Molecular phylogenetic studies suggest the family originated in the late Cretaceous to early Paleogene period
• Crassulacean Acid Metabolism (CAM) photosynthesis, a hallmark of the family, evolved as an adaptation to arid environments
Stems:
• Slender, fleshy, and branching; initially erect but becoming decumbent or trailing with age
• Covered densely with small, closely packed leaves
• Stems root readily at nodes when in contact with soil (adventitious rooting)
Leaves:
• Succulent, fleshy, and oblong to oblanceolate (~1.5–3 cm long, ~0.5–1 cm wide)
• Bright golden-yellow to chartreuse in full sun; greener in shade
• Arranged spirally along the stem, tightly overlapping in a rosette-like pattern
• Leaf tips may develop orange to reddish tinges under strong light or cool temperatures
• Surface is smooth and slightly glossy, with a waxy cuticle that reduces water loss
Flowers:
• Small, star-shaped, white to pale yellow
• Borne in terminal corymbose inflorescences
• Each flower has 5 petals, approximately 5–8 mm in diameter
• Blooming typically occurs in spring to early summer
• Flowers are attractive to pollinators such as bees and butterflies
Roots:
• Fibrous and shallow, adapted to absorb moisture quickly from light rainfall or dew
• Native habitat: rocky slopes, cliff crevices, and well-drained outcrops in semi-arid Mexican highlands
• Exhibits Crassulacean Acid Metabolism (CAM) photosynthesis — stomata open at night to collect CO₂ and close during the day to minimize water loss
• Tolerates poor, sandy, or rocky soils with minimal organic content
• Prefers full sun to partial shade; leaf color is most vivid under bright light
• Cold hardiness is limited; generally hardy to approximately -1 to 2°C (USDA zones 9–11)
• In cultivation, it is often grown in containers, rock gardens, green roofs, and as ground cover in frost-free climates
Reproduction:
• Easily propagated vegetatively — stem cuttings and leaf cuttings root readily
• Also reproduces by seed, though vegetative propagation is far more common in cultivation
• Broken stem fragments can root independently, contributing to its potential to naturalize in suitable climates
Light:
• Full sun to bright indirect light for best color and compact growth
• At least 4–6 hours of direct sunlight daily to maintain golden foliage
• Insufficient light causes etiolation (stretching) and loss of vibrant color
Soil:
• Extremely well-draining soil is essential
• Recommended mix: cactus/succulent potting mix with added perlite, pumice, or coarse sand (approximately 50% inorganic material)
• Avoid heavy, water-retentive soils
Watering:
• 'Soak and dry' method — water thoroughly, then allow soil to dry completely between waterings
• Reduce watering significantly in winter during dormancy
• Overwatering is the most common cause of failure, leading to root rot
Temperature:
• Optimal growing range: 18–27°C
• Can tolerate brief periods of light frost but prolonged freezing is fatal
• Protect from temperatures below 0°C
Propagation:
• Stem cuttings: cut a 5–10 cm stem segment, allow to callous for 1–3 days, then place on well-draining soil
• Leaf propagation: gently twist a healthy leaf from the stem, allow to callous, and lay on soil — new plantlets will emerge from the base
• Both methods root within 2–4 weeks under warm, bright conditions
Common Problems:
• Root rot — caused by overwatering or poorly draining soil
• Mealybugs and aphids — treat with insecticidal soap or neem oil
• Etiolation (leggy growth) — insufficient light; move to a brighter location
• Leaf drop — may indicate overwatering, cold stress, or natural leaf shedding
Anecdote
Golden Sedum's brilliant golden color is not just for show — it is a survival strategy: • The golden to orange pigmentation is partly due to carotenoid pigments, which act as a natural 'sunscreen' protecting the plant's photosynthetic machinery from excessive UV radiation • This adaptation allows Sedum adolphi to thrive in exposed, high-light environments where other plants might suffer photodamage CAM Photosynthesis — A Nighttime Trick: • Sedum adolphi opens its stomata at night to take in CO₂, storing it as malic acid in its succulent leaves • During the day, when stomata are closed to conserve water, the stored CO₂ is released internally for photosynthesis • This remarkable adaptation reduces water loss by up to 90% compared to typical C3 plants • CAM photosynthesis has evolved independently in over 35 plant families, including Crassulaceae, Cactaceae, and Orchidaceae Succulents in Space: • NASA's Clean Air Study included various succulents for their ability to filter indoor air pollutants • While Sedum adolphi was not specifically tested, many Crassulaceae species contribute to improved indoor air quality through their nighttime CO₂ uptake The name 'Sedum' comes from the Latin word 'sedere,' meaning 'to sit' — a reference to the way many stonecrop species sit tightly on rocks and walls, seemingly defying gravity with their shallow root systems.
En savoir plus
