Common Name: Islay Cactus
Scientific Name: Echinopsis subdenudata (formerly known as Echinopsis or Trichocereus)
Origin: Native to South America, particularly found in regions like Brazil and Argentina.
 
Description:
The Islay cactus, often referred to as the "Lady Finger Cactus," is a visually striking succulent known for its tall, cylindrical shape and vibrant flowers. Typically reaching heights of 30-60 cm (12-24 inches), it has a smooth, green stem that may be slightly ribbed. The plant is notable for its ability to produce large, showy flowers, which bloom in various shades of white, pink, or yellow, often at night. The flowers can reach up to 15 cm (6 inches) in diameter and are highly fragrant.
 
Light Requirements:
Sunlight: Prefers bright, direct sunlight for at least 4-6 hours a day. A south or west-facing window is ideal.
Avoid: Prolonged periods of deep shade, which can lead to etiolation (stretching) and reduced flowering.
 
Watering:
Frequency: Water thoroughly during the growing season (spring and summer) when the top 1-2 inches of soil are dry. In fall and winter, reduce watering significantly.
Method: Water deeply, allowing excess water to drain out. Ensure that the pot has good drainage to prevent root rot.
 
Soil:
Type: Use a well-draining cactus mix or create your own by mixing potting soil with sand, perlite, or pumice.
pH: Slightly acidic to neutral (around 6.0 to 7.0).
 
Temperature and Humidity:
Temperature: Thrives in warm temperatures between 20-30°C (68-86°F). Protect from frost and extreme cold.
Humidity: Prefers low humidity; avoid high humidity environments to reduce the risk of fungal issues.
 
Fertilization:
Frequency: Fertilize during the growing season with a diluted cactus fertilizer once a month. Avoid fertilization during the winter months.
Type: Use a balanced, water-soluble fertilizer formulated for cacti.
 
Repotting:
When: Repot every 2-3 years or when the cactus outgrows its container.
Method: Carefully remove the cactus from its pot, ensuring minimal disturbance to the roots, and replace with fresh, well-draining soil.
 
Pests and Problems:
Common Pests: Watch for mealybugs, aphids, and spider mites. Treat infestations promptly with insecticidal soap or neem oil.
Rot: Overwatering can lead to root rot. Ensure proper drainage and allow the soil to dry out thoroughly between waterings.
 
Additional Tips:
Propagation: The Islay cactus can be propagated from seeds or offsets. Seeds should be sown in a well-draining medium and kept warm and moist until germination.
Display: Ideal for container gardens, rock gardens, or as a standout specimen in a succulent collection. Its tall form and striking flowers make it an attractive focal point.
 
With the right care, the Islay cactus can thrive and bring beauty to your plant collection!