The Candelabra Cactus, a fascinating succulent often sought for its unique form, can indeed produce flowers, though this event is considered rare and highly anticipated by growers. Understanding its specific needs is key to encouraging these distinctive blooms.
Understanding the Candelabra Cactus
The plant commonly referred to as Candelabra Cactus is primarily Euphorbia lactea ‘Cristata’, also known by names such as Coral Cactus, Crested Elkhorn, or Mottled Spurge. Despite its common name, it is a succulent, not a true cactus, belonging to the Euphorbia family. The ‘Cristata’ form is characterized by its wavy, fan-shaped branches that often resemble sea coral or a brain-like structure. These stems can range in color from vibrant green to blue-gray, silver, or even exhibit pink or purple hues, especially when exposed to stress.
The plant typically grows as a slow-growing, evergreen succulent, forming intricate undulating crests. While standard Euphorbia lactea can reach up to 15 feet, the ‘Cristata’ cultivar is smaller, often maintained as a 1 to 3-foot houseplant. It is often grafted onto the rootstock of another Euphorbia species, such as Euphorbia neriifolia, creating a composite plant.
The Distinctive Bloom
The flowers of the Candelabra Cactus are small and generally inconspicuous. They typically appear as small, greenish flowers, sometimes with yellow, red, pink, or purple tinges. These minute blossoms, measuring around 2 to 3 inches in width, emerge in clusters along the edges or tips of the crested stems.
Blooming is a rare event for Euphorbia lactea ‘Cristata’, especially indoors. Flowers are usually produced during the spring and summer months, the plant’s active growing season. The presence of flowers adds a unique touch, contrasting with the plant’s sculptural form, even if they are not overtly showy.
Encouraging Flower Production
To encourage flowering, provide optimal environmental conditions. This plant thrives in bright light, requiring full sun to partial shade, ideally with morning direct sunlight. Avoid intense afternoon sun, especially in hot climates, as it can cause sunburn or discoloration. Indoors, place it near a south or west-facing window; grow lights can supplement natural light.
Water the Candelabra Cactus deeply only when its well-draining soil has completely dried out. Overwatering leads to root rot, but unlike some cacti, Euphorbia lactea ‘Cristata’ does not tolerate long periods of drought. During the active growing season (spring and summer), water every one to two weeks. In autumn and winter, reduce watering to once a month or less.
Temperature significantly impacts growth and blooming. This succulent prefers warm temperatures, ideally 68°F to 85°F (20°C to 29°C). It is sensitive to cold and must be protected from freezing, requiring indoor overwintering when temperatures drop below 40°F (4°C). A slight drought period before the growing season can help induce blooming.
Fertilization should be minimal. During the growing season (spring and summer), a balanced liquid fertilizer, such as a 10-10-10 formula, diluted to half or quarter strength, can be applied monthly. Avoid over-fertilizing, as less is often more for these plants.
Post-Bloom Care
After blooming, continued care ensures the plant remains healthy. No specific pruning of spent flower stalks is required, as the small flowers often fall away naturally. Remove any damaged or diseased parts.
Maintain consistent care, including established watering and lighting routines. As a slow-growing succulent, the Candelabra Cactus benefits from stable conditions. Ensure it receives adequate bright light and appropriate watering, allowing the soil to dry between applications, to support its vigor and future blooming.