The Araucaria araucana, also known as the Araucaria pine, pehuén, or simply araucaria, is one of the most striking and long-lived trees on the planet. Its unique aesthetic and ancient history have made it a species admired by botanists and gardening enthusiasts alike. This comprehensive article offers everything you need to know to know how to grow a monkey puzzle tree. Understanding, growing, and caring for the Araucaria araucana, integrating botanical information, practical advice, and interesting facts, as well as addressing the most common problems that can affect this species in both outdoor and indoor gardens.
Characteristics of the Araucaria araucana
- Family: Araucariaceae.
- Scientific name: Araucaria araucana.
- Origin: Mountainous regions of Chile and Argentina, especially in the Andes mountain range.
- Plant type: Conifer, evergreen and with spectacular longevity.
The araucaria stands out for its majestic bearingIn its natural habitat it can reach over 50 meters in height, although cultivated in gardens, its growth is much slower and more controlled, reaching considerable dimensions only after decades. It has a straight and robust trunk, covered with thick, rough bark that makes it resistant to fires and adverse conditions. The branches grow horizontally and are arranged in tiers or whorls, creating a unique silhouette that is highly prized as an ornamental plant.
Its leavesThe scale-shaped or triangular needle-shaped araucaria trees are rigid, leathery, and deep green. Some can be sharp to the touch, so it's recommended to avoid planting them in children's play areas or where pets could get hurt.
As for its longevity, the Araucaria araucana can live hundreds or even thousands of yearsThe lower branches tend to dry out over time, which is normal in mature specimens.
Ideal growing conditions
- Light: Prefer full sun Although it tolerates semi-shade, it is recommended that it receive at least 3 to 6 hours of direct light per day for optimal development. Avoid excessively dark exposures, which inhibit growth.
- Temperature: It adapts to temperate and cool climatesIt tolerates frost and intense cold better than extreme, dry heat. Its optimal temperature range is between slightly below zero and 25°C. Prolonged exposure to excessive heat can cause damage and water stress.
- Humidity and ventilation: It thrives in humid environments, especially when grown indoors. It's recommended to spray the leaves in dry environments to delay yellowing and the fall of lower branches.
When planting in open spaces, it is important to consider the Available space, as their roots can spread widely and uproot nearby structures. It's advisable to leave a perimeter of at least 8 meters clear around them.
Soil and transplant
The araucaria needs a deep soil, rich in organic matter and with excellent drainageIt prefers slightly acidic to acidic soils (pH 5.5 to 6.5) and does not tolerate waterlogging. A mixture of garden soil, peat, and sand in equal parts is recommended to ensure good aeration and prevent root rot.
Planting can be done when conditions are not extreme (neither in the middle of winter nor in summer). If a potted plant is repotted, it should preferably be done during the active growth phase to facilitate adaptation. Once the plant exceeds one meter in height, repotting is no longer necessary; simply replace the first few centimeters of substrate each season.
Araucaria araucana care outdoors
- Irrigation: Moderate. The tree does not tolerate waterlogging, nor does it tolerate prolonged drought. During the warmer months, water every 1 to 2 weeks depending on weather conditions and soil type. In dry summers, watering can be increased, always avoiding overwatering.
- Mulch: Place a 5-8 cm layer of organic mulch around the base to retain moisture and protect the roots.
- Fertilization: Apply light and balanced fertilizer In early spring and summer, once a month during the growing season. Too much fertilizer can damage the roots; avoid overfeeding.
- Pruning: It's not usually necessary except to remove dry, broken, or diseased branches. It's recommended to do it in late winter or early spring.
In open spaces, keep in mind that branches and cones may fall, so it is best to avoid planting them near areas with frequent traffic.
Indoor and pot care
In interior spaces, the araucarias (especially the variety Araucaria heterophylla, very popular as a pot plant) tend to be kept much smaller than their outdoor relatives, reaching up to 2 meters.
- Light: It needs plenty of indirect light. Place the plant near a well-lit window or use full-spectrum artificial light, especially in winter or in urban homes with limited light.
- Irrigation: Keep the soil slightly moist but never waterlogged. Water whenever you notice the top few centimeters of the substrate are dry. In dry climates, mist the leaves every 7–10 days during the winter to improve humidity.
- Humidity: If the environment is very dry, using a basic humidifier helps prevent lower branches from yellowing and falling prematurely.
- Transplant: Repot the plant to a slightly larger pot each year while it's young. When it reaches 1 meter in height, replace only the top layer of potting soil with a fresh, rich potting mix.
- Pruning: Not recommended. Limit yourself to removing damaged or dead branches.
Monitor growth: Although growth in pots is much slower and more controlled, once it reaches a considerable size, the Araucaria will no longer adapt well indoors and may need to be moved outdoors.
Reproduction and propagation
The Araucaria araucana reproduces mainly from seeds (pine nuts)The large, hard-shelled seeds can be collected from ripe cones and require special preparation:
- Scarification: It is recommended to scratch the seed shell superficially to facilitate the entry of moisture.
- Stratification: Store seeds in a refrigerator for several weeks before planting to encourage germination.
- Sowing: Plant the seeds in moist, well-drained soil. It may take several months for the seeds to germinate, provided the soil is kept moist but not saturated.
Another technique is cutting, which is not so common in this species and is usually used more in ornamental indoor varieties such as Araucaria heterophylla.
Plagues and diseases
The Araucaria araucana is very resistant to pests and diseases, but can occasionally be affected by:
- Mealybugs: These pests often settle on branches and leaves. They can be removed with horticultural oils or a cloth moistened with alcohol.
- Mites and red spider: They tend to appear in dry, warm environments. Increase humidity and apply acaricides if necessary.
- Aphids: Control with soapy water or specific insecticides.
- Thrips and scales: They appear occasionally, but are usually easily controlled.
- Root rot: The most serious disease, caused by overwatering and compacted or waterlogged soils. Prevent by ensuring proper drainage, good ventilation, and elimination of excessive moisture.
- Leaf spots and sooty mold: They can be treated with specific fungicides and ensuring good ventilation and elimination of excessive moisture.
Curiosities, symbolism and cultural considerations
The Araucaria araucana is sacred to indigenous peoples from Chile and Argentina, who attribute it symbolism of strength and endurance. Its seeds, pine nuts, are an important traditional food and are edible. Furthermore, this tree's thick bark and ability to regenerate after fires have facilitated its adaptation to adverse environments.
Due to its rarity and ecological relevance, the Araucaria is protected by national and international laws, especially in its natural habitat, where it is considered a natural monument.
Keep in mind that needles or leaves Araucaria trees can be really hard and sharp, so it is not recommended to plant them in areas where small children or unsuspecting pets pass by.
Varieties of Araucaria
The Araucaria genus encompasses several species, of which the Araucaria araucana is the most emblematic. However, there are variants suitable for different purposes:
- Araucaria heterophylla: The most widely used in interior decoration, recognizable by its pyramidal shape and more delicate appearance. More information about Araucaria heterophylla.
- Araucaria angustifolia: Similar in appearance, but adapted to other areas and climates.
- Araucaria columnaris and cunninghamii: More common in warm and coastal areas, they reach large dimensions.
- Araucaria bidwillii: Especially used in large gardens and parks. Information about Araucaria bidwillii.
Each species has unique characteristics in terms of size, leaf type, and tolerance to different environmental conditions.
Adaptations and longevity
The Araucaria araucana is one of the oldest plants in the world, with fossil records dating back to the Mesozoic. This explains its resilience, longevity, and ability to survive extreme weather events and fires.
Its growth rate is slow. It can typically take a decade or more to reach 10 meters in height under ideal conditions, and easily exceeds hundreds of years of lifespan in its natural habitat.
Due to its evolutionary history and unusual appearance, the Araucaria araucana is considered a living symbol of connection with the past and a natural testament to the resilience of forests.
Growing and caring for the Araucaria araucana is a challenging but highly rewarding experience, as few trees can match its majesty, longevity, and the visual impact it offers in any space. By ensuring a suitable environment and basic care, the Araucaria can accompany you for generations as a silent witness to the most ancient nature on Earth.
