Old Man Cactus

Name: Old Man Cactus
Brand: The Sill
SKU: BN-ESP-NAN-5-GR7BK
Price: 59.00 USD
Availability: OutOfStock

Bright Direct Light 2 in./yr Growth Safe for Pets

Bring home a conversation starter—the Old Man Cactus thrives on neglect, loves the sun, and features whimsical white fuzz that gives it its signature look.

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Old Man Cactus Information

About & Sizing

About The Old Man Cactus

The Old Man Cactus, scientifically known as Cephalocereus Senilis, is named for its distinctive white, hair-like covering that brings to mind your sweet Nana or Pop Pop. This is a slow-growing cactus that thrives in bright light and requires minimal watering, making it an excellent low-maintenance choice for plant lovers.

Note: Our cacti aren’t cuttings—they’re fully rooted plants! This means they’re already established and ready to thrive in their new home. Succulents naturally have shallow roots, so don’t be surprised if that’s what you see, it’s a completely natural trait!

Each plant is unique; size and shape fluctuate by season so all measurements are shown as a range
Medium plants measure 9-13 inches tall from bottom of the grow pot to the top of the foliage
Arrives in a nursery grow pot nestled in your planter choice

Sizing Guide

Small

Approximately 5" in diameter, fits plants in a 4" grow pot or smaller

Medium

Approximately 7" in diameter, fits plants in a 6" grow pot or smaller

Large

Approximately 10-12" in diameter, fits plants in a 10" grow pot or smaller

Massive

Approximately 12-14" in diameter, fits plants in a 12" grow pot or smaller

Care Guide

Watering Requirements

Water every 2-3 weeks in direct light, allowing soil to dry out between waterings. Expect to water more often in brighter light and less often in lower light.

Sunlight Requirements

Thrives in bright direct light, but can tolerate bright indirect light.

Humidity Requirements

Cacti prefer low humidity levels, so it's best to keep them in a dry environment. Avoid placing them in a bathroom or other area with high humidity, as this can cause fungal diseases to develop or the soil to remain moist for too long.

Pet-Friendly Plant?

Yes, this plant is safe for homes with pets.

Read our full care guide

FAQs

Frequently Asked Questions

Yes, the hair is completely real and made of modified, elongated spines that have lost their rigidity, transforming into soft, hair-like strands that wrap around the stem of the cactus. The hair acts as a natural shade cloth that reflects harsh UV rays to prevent sunburn, while trapping a layer of warm air to protect against freezing desert nights. Additionally, it captures morning dew and fog, channeling the moisture directly down to the roots.

Is the hair on the Old Man Cactus real, and what is its purpose?

Yes, the hair is completely real and made of modified, elongated spines that have lost their rigidity, transforming into soft, hair-like strands that wrap around the stem of the cactus. The hair acts as a natural shade cloth that reflects harsh UV rays to prevent sunburn, while trapping a layer of warm air to protect against freezing desert nights. Additionally, it captures morning dew and fog, channeling the moisture directly down to the roots.

It is usually caused by hard water minerals, or incorrect lighting. If kept in a dim room, the hair will thin out and the existing hair can take on a dull, yellowish tint. Splashing tap water containing heavy minerals onto the hair can also stain it yellow over time.

Why is the white hair on my Old Man Cactus turning yellow or brown?

It is usually caused by hard water minerals, or incorrect lighting. If kept in a dim room, the hair will thin out and the existing hair can take on a dull, yellowish tint. Splashing tap water containing heavy minerals onto the hair can also stain it yellow over time.

Yes! If the coat becomes dusty or stained, you can safely wash it to restore its bright white appearance. Mix a few drops of castile soap into warm water and gently scrub the hair using a soft toothbrush, working from the top down. Avoid getting soapy water into the soil. Spray the hair with clean, distilled water to rinse away the soap residue. Place the cactus in a warm area with excellent air circulation so the hair dries quickly. Once completely dry, you can use a clean toothbrush or a fine-toothed mustache comb to gently fluff the hair back out!

Can you wash or groom the hair on an Old Man Cactus?

Yes! If the coat becomes dusty or stained, you can safely wash it to restore its bright white appearance. Mix a few drops of castile soap into warm water and gently scrub the hair using a soft toothbrush, working from the top down. Avoid getting soapy water into the soil. Spray the hair with clean, distilled water to rinse away the soap residue. Place the cactus in a warm area with excellent air circulation so the hair dries quickly. Once completely dry, you can use a clean toothbrush or a fine-toothed mustache comb to gently fluff the hair back out!

Planter Info