Common Name: Old Lady Cactus
Family: Cactaceae
Origin: Native to Argentina, particularly in the provinces of Mendoza and San Juan.
 
Description:
Notocactus mammulosus, commonly known as the Old Lady Cactus, is a charming and visually striking species. It typically grows in a globular shape, reaching heights of about 10-15 cm (4-6 inches) and a diameter of up to 15 cm (6 inches). This cactus is characterized by its densely packed, woolly areoles, which give it a fuzzy appearance. The plant features pronounced ribs and can have short, fine spines that are often yellow or white. In late spring and early summer, Notocactus mammulosus produces stunning, bright yellow or orange flowers that emerge from the top of the cactus, adding a splash of color to its attractive form.
 
Light Requirements:
Sunlight: Prefers bright, indirect sunlight to full sun. Aim for at least 4-6 hours of direct sunlight daily.
Avoid: Prolonged periods of deep shade, which can lead to etiolation and weakened growth.
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 at the base, allowing excess water to drain out completely. Avoid letting the cactus sit in water 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 rot and fungal issues.
Fertilization:
Frequency: Fertilize during the growing season with a diluted cactus fertilizer once a month. Do not fertilize during winter dormancy.
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, minimizing disturbance to the roots, and replace with fresh, well-draining soil.
Pests and Problems:
Common Pests: Watch for mealybugs, spider mites, and scale. Treat infestations promptly with insecticidal soap or neem oil.
Rot: Overwatering can lead to root rot. Ensure good drainage and allow the soil to dry out thoroughly between waterings.
 
Additional Tips:
Propagation: Notocactus mammulosus 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 part of a succulent collection. Its unique appearance and beautiful flowers make it a delightful focal point.
 
With the right care, Notocactus mammulosus can thrive and bring a unique charm to your cactus collection!