Indian Euphorbia mammillaris variegata, commonly known as Variegated Corn Cob Cactus, is a unique succulent plant prized for its cylindrical stems adorned with striking variegation. Here are care instructions specifically tailored for Euphorbia mammillaris variegata:

1. Light: Place your Variegated Corn Cob Cactus in a bright location with indirect sunlight. It can tolerate some morning sun or filtered sunlight but should be protected from intense afternoon sun, which can scorch the delicate stems. A south or west-facing window where it receives bright, indirect light is ideal indoors.

2. Temperature: Maintain moderate room temperatures between 65-75°F (18-24°C) during the growing season. Protect the plant from temperatures below 50°F (10°C), as it is sensitive to cold and frost.

3. Watering: Water Euphorbia mammillaris variegata sparingly, allowing the soil to dry out completely between waterings. During the active growing season (spring and summer), water thoroughly when the top inch (2.5 cm) of soil feels dry. In fall and winter, reduce watering to prevent root rot, watering only when the soil is dry several inches deep.

4. Humidity: Variegated Corn Cob Cactus is tolerant of average indoor humidity levels. It does not require high humidity but benefits from occasional misting in dry indoor environments to increase humidity around the plant.

5. Soil: Plant Euphorbia mammillaris variegata in a well-draining cactus or succulent potting mix. A mixture of potting soil, perlite, and coarse sand works well to ensure good drainage. Use a pot with drainage holes to prevent water from accumulating around the roots.

6. Fertilizing: Feed your Variegated Corn Cob Cactus with a balanced liquid fertilizer diluted to half-strength every 4-6 weeks during the growing season (spring and summer). Avoid fertilizing in fall and winter when growth slows down.

7. Potting: Repot your Euphorbia mammillaris variegata every 2-3 years in spring if it outgrows its pot. Choose a slightly larger pot with good drainage and fresh succulent potting mix. Handle the plant with care due to its spiny stems.

8. Pruning: Trim any dead or damaged stems with clean, sharp scissors or pruning shears. Wear gloves to protect your hands from the plant's spines. Pruning encourages new growth and helps maintain the plant's shape.

9. Pests: Monitor your Variegated Corn Cob Cactus for common pests such as spider mites or mealybugs. Inspect the stems and leaf axils regularly. Treat any pest infestations promptly with insecticidal soap or neem oil.

10. Propagation: Propagate Euphorbia mammillaris variegata through stem cuttings. Allow the cuttings to callus for a few days before planting them in a well-draining succulent mix. Keep the soil lightly moist until new roots develop.

By following these care instructions, you can enjoy growing and caring for your Variegated Corn Cob Cactus, admired for its unique appearance and variegated stems, as a striking addition to your succulent collection.