Light
Bright Indirect Light
Thrives best under bright indirect sunlight or filtered sun; tolerates some direct morning sun.
Reference image Myrtillocactus eichlamii
Guatemala Blue Candle Cactus
Overview
Myrtillocactus eichlamii is an arborescent or shrubby, columnar cactus species belonging to the family Cactaceae. It is highly valued in cultivation for its beautiful blue-green, waxy glaucous stems and structural appeal.
Taxonomy and Naming
Originally described by the German botanist Alwin Berger, the species is a distinct member of the genus Myrtillocactus 1. Its specific epithet honors Federico Eichlam, who made significant contributions to the botanical exploration of Guatemala 2.
Distribution and Habitat
The species is native to the seasonally dry tropical biomes of Guatemala and southern Mexico 1. It typically thrives on dry, rocky slopes and volcanic soils within deciduous forest margins.
Appearance
In its natural habitat, this succulent tree can reach heights of 4 to 5 meters, forming a highly branched crown. The stems are covered with a characteristic waxy bloom that gives them a glaucous blue-grey shade. The spines are short, and the small, cream-colored flowers yield edible berries.
Cultivation and Care
This species is relatively easy to care for in container cultivation. It thrives in bright, indirect sunlight or filtered sun. Water thoroughly during the growing season only after the substrate has dried out completely.
Common Cultivation Errors
Overwatering and using heavy, poorly-draining soil mixes are the leading causes of root rot. Exposure to high humidity combined with low winter temperatures can trigger fungal scarring on the stems.
Bibliography
References
Watering
10-30 Days
Water deeply in spring and summer only when the soil is 100% dry. Keep dry in winter.
Soil
Excellently draining cactus mix rich in pumice and coarse sand
Use a specialized succulent mix with high inorganic content like pumice, gravel, and perlite.
Safety
Pet Friendly
Non-toxic to pets and humans, but the sharp spines can cause minor mechanical injury.
Difficulty
Easy
Easy to grow for beginners provided it is kept in extremely well-draining soil and not overwatered.
Native Habitat
Guatemala, Southern Mexico
Found in the seasonally dry tropical forests of Guatemala, where it adapts to rocky, volcanic, and well-draining landscapes.
Frequently Asked Questions
Can Myrtillocactus eichlamii be grown in a pot?
Yes, it is highly suitable for pot cultivation. However, you must use pots with drainage holes and highly porous cactus soil to prevent root rot.
How often should I water it?
During summer, water approximately every 10 days (only when the soil is completely dry), and reduce to once a month during winter.
What light conditions does it prefer?
It prefers plenty of bright, indirect, or filtered sunlight. Protect it from scorching direct midday sun.
Is Myrtillocactus eichlamii toxic to cats and dogs?
No, this cactus species is non-toxic to pets. However, its sharp spines can cause physical injury.
What type of soil should I use?
Use a well-draining cactus and succulent mix rich in inorganic materials like pumice, lava rock, and perlite.
How fast does it grow?
Myrtillocactus eichlamii is a slow-to-moderate grower in pots; with proper care and warmth, it can grow several centimeters each year.
Does it produce flowers?
Yes, once mature, it produces small, funnel-shaped, creamy-white flowers, usually during spring or summer.
Where should I keep my cactus during winter?
Keep it in a frost-free, dry, and cool room above 5°C (41°F), and keep watering to an absolute minimum.
How does it maintain its blue color?
The waxy blue-grey coating (pruina) becomes more pronounced with abundant bright light. Avoid touching the stem with bare hands to keep this layer intact.
What causes brown spots on the stem?
Brown spots are typically a sign of rot caused by overwatering or exposing the plant to cold, damp conditions during winter.