Old Man Cactus 

Description:
The Old Man Cactus, scientifically known as Cephalocereus senilis, is a unique and striking cactus native to Mexico. This cactus is easily recognized by its thick, white, woolly spines that give it the appearance of a wise old man with a long beard, hence the name "Old Man Cactus." It has a tall, columnar shape, and as it matures, it can reach heights of up to 15 feet (4.5 meters) in the wild, though it grows much slower when kept indoors. The woolly covering provides protection from the sun, helping the plant thrive in its native desert habitat. This cactus is often sought after by collectors due to its distinctive, furry appearance.

Care Guide:

1. Light:

   • Thrives in full sun and requires at least 6 hours of direct sunlight per day to maintain its characteristic woolly appearance.
   • If grown indoors, place it near a south or west-facing window for optimal light exposure.
   • Can tolerate partial shade but will grow more slowly and might lose some of its dense wool.

2. Watering:

   • Allow the soil to dry out completely between waterings.
   • Water thoroughly but infrequently, ensuring the water drains well from the pot.
   • During the winter months, reduce watering as the plant enters dormancy.
   • Overwatering can lead to root rot, so always ensure the pot has good drainage.

3. Soil:

   • Requires well-draining soil, such as a cactus or succulent mix.
   • You can also add sand or perlite to regular potting soil to improve drainage.
   • Make sure the pot has drainage holes to prevent water from accumulating at the bottom.

4. Temperature:

   • Prefers warm temperatures between 70-100°F (21-38°C).
   • Avoid temperatures below 50°F (10°C), as this cactus is sensitive to cold and frost.
   • Ideal for indoor settings where it can be protected from extreme weather.

5. Fertilizing:

   • Fertilize during the growing season (spring and summer) with a diluted cactus or succulent fertilizer.
   • Apply fertilizer every 4-6 weeks to encourage healthy growth.
   • Avoid fertilizing during the winter when the plant is dormant.

6. Humidity:

   • Prefers low humidity, similar to the dry desert conditions it originates from.
   • Keep it in a dry environment, away from damp or humid areas.

7. Pruning:

   • Little to no pruning is required for the Old Man Cactus.
   • Remove any dead or damaged parts carefully.
   • Handle the cactus with care as its spines can be quite sharp and may cause irritation.