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Description
Cephalocereus Senilis, commonly known as the Old Man Cactus, is a slow-growing cactus that is native to the highlands of central Mexico. It belongs to the Cactaceae family and is known for its long white hairs that cover its stem. The cactus can grow up to 20 feet in height and 6 inches in diameter. It has a narrow cylindrical shape that widens as it grows older.
Taxonomic Information
| Domain | Eukarya |
|---|---|
| Kingdom | Plantae |
| Phylum | Tracheophyta |
| Class | Magnoliopsida |
| Order | Caryophyllales |
| Family | Cactaceae |
| Genus | Cephalocereus |
Appearance
The Old Man Cactus has a unique appearance due to its dense covering of long white hairs that grow from its stem. These hairs protect the cactus from the sun and help to regulate its temperature. The stem is green when young but turns grey as it ages. The cactus produces small white flowers that grow on the top of the stem and bloom from April to June. The flowers are followed by red or green fruit that is edible but not typically consumed.
Care Guide
The Old Man Cactus is a hardy plant that requires minimal care. It prefers well-draining soil and should be watered sparingly, allowing the soil to dry out between watering. It can tolerate full sun to partial shade and is hardy to USDA zones 9 to 11. Fertilization is not necessary but can be done sparingly during the growing season.
Common Pests & Diseases
The Old Man Cactus is relatively pest-resistant but can be susceptible to mealybugs and spider mites. It can also be affected by root rot if overwatered or grown in poorly draining soil. To prevent pests and diseases, ensure that the cactus is grown in well-draining soil and watered sparingly.
Habitat
The Old Man Cactus is native to the highlands of central Mexico, where it grows in rocky, well-draining soil. It can tolerate hot, dry summers and cold, wet winters. It is commonly grown as a houseplant or in outdoor gardens in areas with a similar climate.
Question and Answer
Q: How often should I water my Old Man Cactus?
A: Water sparingly, allowing the soil to dry out between watering.
Q: Can the Old Man Cactus be grown outdoors?
A: Yes, it can be grown outdoors in areas with a similar climate to its native habitat.
Q: Is the fruit of the Old Man Cactus edible?
A: Yes, the fruit is edible but not typically consumed.
Q: Is fertilization necessary for the Old Man Cactus?
A: Fertilization is not necessary but can be done sparingly during the growing season.
Related Plants
- Cephalocereus Apicicephalium
- Cephalocereus Juulianus
- Cephalocereus Monstruosus
- Cephalocereus Palmaris
References
- “Cephalocereus Senilis.” The Spruce. Accessed 9 Sept. 2021. <https://www.thespruce.com/old-man-cactus-profile-4841854>.
- “Cephalocereus Senilis (Old Man Cactus).” World of Succulents. Accessed 9 Sept. 2021. <https://worldofsucculents.com/cephalocereus-senilis-old-man-cactus/>.
- “Cephalocereus Senilis.” Arizona State University. Accessed 9 Sept. 2021. <https://cals.arizona.edu/yavapai/anr/hort/byg/archive/cephalocereussenilis.html>.
