Euphorbia lactea ‘White Ghost’ is a striking succulent known for its distinctive appearance. Its pale, ethereal coloration makes it a sought-after addition for indoor spaces or suitable outdoor environments.
Unique Characteristics of White Ghost
Euphorbia lactea ‘White Ghost’ features eye-catching white, creamy, or pale yellow variegation across its stems. It grows in an upright, branched, candelabra-like form, creating a sculptural silhouette. Its stems are typically triangular, often with wavy edges and small, spiky thorns along the ridges.
Despite its common name, “White Ghost Cactus,” it is a succulent shrub, not a true cactus, belonging to the Euphorbiaceae family. Its ghostly white coloration results from a mutation lacking chlorophyll-bearing tissues.
Essential Care for White Ghost
Light Needs
Adequate light is crucial for Euphorbia lactea ‘White Ghost’. It thrives in bright, indirect light, ideally 4-6 hours of sunlight daily. For indoor cultivation, a south or west-facing window is generally suitable, though intense direct afternoon sun can scorch its sensitive, pale stems.
Insufficient light causes leggy growth (etiolation), leading to a loss of its compact form and white hues. If natural light is limited, especially in winter, a quality grow light can maintain its health. Gradual acclimatization over one to two weeks prevents sunburn when moving the plant to brighter conditions or outdoors.
Watering Practices
Proper watering is fundamental, as overwatering commonly causes root rot. It prefers infrequent but thorough watering, characteristic of many succulents. Allow the potting mix to dry out completely between waterings to prevent moisture problems.
During the active growing season (spring and summer), watering every 2-3 weeks or when the soil is entirely dry is often sufficient. Watering should be significantly reduced during dormant winter months, possibly to once a month or less. The “soak and dry” method involves watering thoroughly until water drains from the pot, then allowing the soil to become completely dry before the next watering.
Soil and Drainage
Euphorbia lactea ‘White Ghost’ requires a fast-draining potting mix to prevent waterlogging and root rot. Standard potting soil is too dense and retains excessive moisture. An ideal soil blend promotes rapid drainage and aeration.
A specialized succulent or cactus mix is recommended, or a custom blend of perlite, pumice, or coarse sand mixed with potting soil. Drainage holes are essential to allow excess water to escape. The soil should not compact easily and maintain a slightly acidic to neutral pH.
Temperature and Humidity
Euphorbia lactea ‘White Ghost’ thrives in warm temperatures, 65-85°F (18-29°C). It is sensitive to cold and should be protected from temperatures below 50°F (10°C), as frost causes damage. Indoor plants benefit from a stable environment, away from drafts or sudden temperature fluctuations.
This succulent tolerates average household humidity and does not require high humidity. While it can appreciate moderate humidity (40-60%), very dry indoor air, especially during winter heating, can stress the plant. Good air circulation helps prevent fungal issues, particularly in humid conditions.
Feeding Your Plant
Euphorbia lactea ‘White Ghost’ is not a heavy feeder and benefits from light fertilization during its active growing season (spring and summer). A balanced liquid houseplant fertilizer or one formulated for cacti and succulents is suitable. Dilute the fertilizer to half the strength recommended on the product label, as Euphorbias have sensitive roots that can be burned by full-strength applications.
Fertilization can be applied every 2-4 weeks during the growing season. During fall and winter, when growth slows or becomes dormant, avoid fertilization. Always water the plant thoroughly before applying fertilizer to moist soil to prevent root burn.
Propagating White Ghost
Propagating Euphorbia lactea ‘White Ghost’ is typically done through stem cuttings in spring or early summer when the plant is actively growing. Select a healthy, mature arm from the parent plant and use a clean, sharp knife or sterile pruning shears to take a 4-6 inch cutting. Wear gloves and eye protection due to the irritating milky sap.
After taking the cutting, allow the cut end to dry and form a callus (several days to two weeks) to prevent rot. Some growers rinse the cut end with cool water immediately after cutting to stop sap flow. Once calloused, plant it 1-2 inches deep into a small pot filled with a well-draining cactus or succulent mix. Rooting hormone powder can be used but is not always necessary. Place the potted cutting in a warm spot with bright, indirect light, and water sparingly until roots form (several weeks to months).
Troubleshooting Common Problems
Root rot, primarily caused by overwatering, is a frequent problem. Symptoms include mushy or rotting stems, especially at the base. If rot is suspected, adjust watering and repot into fresh, dry, well-draining soil, removing any affected parts.
Lack of variegation or green reversion (where parts turn deep green) indicates insufficient light. Increasing exposure to bright, indirect light can restore its white coloration. Stunted growth or wilting can indicate underwatering, nutrient deficiency, or being root-bound. Adjusting watering, providing diluted fertilizer, or repotting into a slightly larger container may resolve these issues.
While relatively resistant, Euphorbia lactea ‘White Ghost’ can encounter pests like mealybugs, spider mites, and scale insects. Regular inspection helps in early detection. Treatment includes dabbing mealybugs with 70% isopropyl alcohol or using insecticidal soap and neem oil for broader pest control.
Handling White Ghost Safely
All parts of Euphorbia lactea ‘White Ghost’ contain a poisonous milky white sap (latex) that can irritate skin, eyes, and mucous membranes. Exercise caution when handling the plant, particularly when pruning, propagating, or if damaged.
Wear protective gloves and eye protection when working with this plant. If sap contacts skin, wash the affected area promptly and thoroughly with soap and water. If sap contacts eyes, flush immediately with plenty of water and seek medical attention. Due to its toxic nature, keep Euphorbia lactea ‘White Ghost’ out of reach of pets and young children to prevent accidental ingestion or contact.