How often should I water it?

Water sparingly, allowing the soil to dry out completely between sessions.

Does it need direct sun?

Yes, it thrives in full, bright sunlight.

Plant guide

Golden Barrel Cactus.

Echinocactus grusonii

Pronounced kroen-LEEN-ee-uh groo-SON-ee-eye

Also known as Echinocactus grusonii, barrel cactus, gold barrell cactus, gold-ball cactus, mother-in-law's-seat, Golden Barrel

golden barrel cactus — Photo by zebedeugalinha (CC BY) via iNaturalist

This iconic cactus is a slow growing succulent that forms a perfect, rounded shape. It is famous for its bright yellow spines and striking, ribbed appearance. It thrives in hot, sunny spots and adds a classic desert feel to any collection.

At a glance

Care level: Easy
Plant type: Succulent
Light: Full sun
Indoor light: Direct sun
Water: Every 14 to 30 days
Mature size: Up to 1 meter tall and wide
Growth rate: Slow
Hardiness: USDA 9 to 12
Bloom time: Late spring to early summer

Care

Provide as much direct sunlight as possible to maintain its compact shape and healthy spine color. Allow the soil to dry out completely between waterings, and keep the plant dry during the winter months to prevent rot. Watch for soft or mushy spots on the stem, which indicate overwatering.

Watering: Water deeply during the growing season, but ensure the soil dries out entirely before watering again.
Feeding: Apply a balanced, diluted cactus fertilizer during the active growing season.
Pruning: Pruning is rarely needed, but you can remove dead or damaged spines if necessary.
Repotting: Repot only when the plant has clearly outgrown its container, using thick gloves for protection.
Soil: Well draining cactus mix
Soil pH: 6.0 to 7.5
Temperature: 5 to 40°C
Humidity: 10 to 40%
Drought tolerance: High
Lifespan: Perennial, typically 30 plus years
Deer and rabbits: High

Signs it needs repotting

Roots growing out of the drainage hole
Plant becomes top heavy
Soil no longer absorbs water well

Safety

People: The plant is not toxic, but its sharp spines can cause physical injury.
Pets: The sharp spines can cause physical injury to pets, though the plant itself is not considered toxic if ingested.
Children: Keep this plant away from children due to its extremely sharp and dense spines.
Contact allergens: The sharp spines can cause mechanical skin irritation or puncture wounds.
Airborne allergens: There are no known respiratory allergens associated with this species.
Edibility: This plant is not considered edible and should not be consumed.

How to identify it

Globular, barrel shaped stem
Prominent, sharp yellow spines
Distinct vertical ribs
Dense woolly crown at top

Height: 0.3 to 1m
Spread: 0.3 to 0.8m
Leaves: green, succulent
Flowers: yellow, 4 to 6cm
Fruit: yellow, Late summer

Problems to watch for

MealybugsCommon
Root RotCommon
Scale InsectsUncommon
Spider MitesUncommon

By symptom

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Growing it

Propagation: seed, offsets
When to plant: spring, summer
Overwintering: Keep the plant dry and cool during winter to prevent rot. Ensure it is protected from freezing temperatures.
In containers: It is excellent for containers, provided you use a pot with drainage holes and a gritty cactus mix.

Seed

1. Sow seeds in a well draining cactus mix.
2. Keep the soil lightly moist and warm.
3. Provide bright indirect light until seedlings emerge.

Group this cactus with other slow growing succulents that prefer dry, well draining soil.

Grows well with

Agave · They share similar water and light requirements in a desert landscape.
Aloe · These plants provide a nice textural contrast while thriving in the same conditions.

Similar species

Ferocactus · These also feature prominent spines and a barrel shape.

Science

Family: Cactaceae
Genus: Kroenleinia
Order: Caryophyllales
Class: Magnoliopsida
Native range: Central Mexico
Conservation: This species is critically endangered in its native habitat due to habitat loss and overcollection.

It survives in arid, rocky limestone slopes by storing water in its succulent stem.

Value to wildlife: nectar source
Pollinators: bees
Uses: ornamental, xeriscaping, container gardening

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 2/9
Light: 8/9
Moisture: 1/9
Nutrients: 2/9
Soil reaction: 7/9
Temperature: 8/9

Taxonomy resolved against GBIF.

Questions people ask

How often should I water it?: Water sparingly, allowing the soil to dry out completely between sessions.
Does it need direct sun?: Yes, it thrives in full, bright sunlight.

Where the name comes from

The genus honors the German botanist Kroenlein, while the specific epithet honors the German cactus collector Hermann Gruson.

Good to know

It is often called the golden barrel cactus.
The ribs of the cactus help it expand to store water during rare desert rains.
It can live for over 30 years in cultivation.
The spines provide shade for the plant body, helping it stay cool in intense sun.

Also in

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This guide was generated with AI on September 26, 2026 and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.