Espostoa 'Melanostele' subs. nana (Old Women cactus)

Botanical & Common Names
- Botanical name: Espostoa 'Melanostele' subs. nana
- Common names: Cotton Wool / Old Women Cactus

Background & Origin
Espostoa melanostele subsp. nana, commonly known as the Cotton Wool or Old Woman cactus, is a distinctive columnar cactus native to Ecuador and Peru. A subspecies of Espostoa melanostele, it belongs to a group of cacti admired for their dense, hair-like covering. This cactus forms cylindrical stems that can eventually reach around 1.5 m in height and about 8 cm in diameter. The subspecies nana is smaller and more compact than the standard form, with distinctive white to yellowish wool that gives the plant its soft, cotton-like appearance. In its natural habitat it produces delicate white, bell-shaped flowers that open at night, an adaptation linked to nocturnal pollinators.

Care Level
- Care level: Easy
- Suitable for beginners: Yes

What It Loves
- Bright warm spot
- Letting the compost dry out

What It Dislikes
- Overwatering or sitting in soggy soil
- Dark spots will cause legginess

Best Rooms for This Plant
- Bedroom
- Living room
- Office
- Conservatory

Growth Potential
- Typical height indoors: Up to 1.5m tall with time
- Typical spread: Up to 8 cm wide
- Growth rate: Moderate to fast in growing season
- Pruning required: None

Is This Plant Right for You?
This plant is a great choice if you:
- Love unique, sculptural cacti
- Want a low-maintenance, slow-growing plant

Light
- Best light: Bright warm sunny spot
- Avoid: Dark areas

Watering
- Frequency: Water when soil is completely dry,
- Seasonal note: Reduce watering in winter when growth slows to almost none.

Humidity
- Prefers: No humidity
- Extra humidity helpful?: These plants are native to arid conditions and do not require humidity.

Feeding
- Feed with: A balanced houseplant fertiliser
- Frequency: Once or twice during growing season during spring and summer. No feeding is needed during autumn and winter.

Toxicity
- Pet safe: Yes
- Notes: Keep out of reach of pets and small children to avoid leaf damage.

Repotting
- How often: Once a year
- Signs it’s needed: Roots growing out of the drainage holes, slower growth, or soil drying very quickly. Choose a pot only slightly larger than the current one to avoid overwatering.