Evergreen oak (Quercus ilex)

Also known as: Holm oak

The Holm Oak (Quercus ilex), also known as Evergreen Oak, is indigenous to the Mediterranean region. It is commonly found in parks and has a historical significance for its use in making pillars, tools, and wagons. Additionally, the Holm Oak is one of the three species utilized in the cultivation of truffle orchards. Notably, the oldest known specimen, estimated to be around 1,200 years old, is located in Spain.

In This Article

Care Tips Water Sunlight Temperature Soil Fertilize Prune Propagation Repotting Toxicity

Attributes of Evergreen oak

Lifespan

Perennial

Plant Type

Tree

Plant Height

12 m to 21 m

Spread

12 m to 21 m

Leaf Color

Green

Flower Size

2.5 cm

Flower Color

Yellow Green

Images of Evergreen oak

Quickly Identify Evergreen oak

The Holm Oak can be identified by its dark green, holly-like leaves which are glossy and have a spiny margin. The leaves are typically 4-8 cm long. It produces small, inconspicuous flowers and acorns that are about 2-3 cm in length.

Scientific Classification of Evergreen oak

Phylum

Vascular plants

Class

Dicotyledons

Order

Fagales

Family

Beech

Genus

Oaks

Species

Evergreen oak

Planting and Growing of Evergreen oak

Care Difficulty

Easy

Watering Schedule

Every 3 days

Sunlight Requirements

Full sun

Sunshine Duration

4-6 hours

Ideal Temperature

60-75℉

Soil Type

Potting Mix, Peat Mix

Soil pH

6.5-7.5

Fertilizer Type

Balanced

Pruning Season

Spring, Summer

Pruning Area

Branches, Leaves

Pruning Frequency

2 times a year

Repotting Season

Spring

Pot Type

Plastic, Ceramic

How to Water Evergreen oak?

For Quercus ilex, it is essential to water deeply but infrequently. Water until it penetrates the soil to about 12 inches deep, ensuring that the roots get a generous soak. The soil should be completely wet but not waterlogged to prevent root rot.

What are the symptoms of an underwatered Evergreen oak? ›

What should I do if my Evergreen oak is not getting enough water? ›

What are the symptoms of an overwatered Evergreen oak? ›

How to save an overwatered Evergreen oak? ›

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What Are the Sunlight Requirements for Evergreen oak?

Sunlight Requirements: Full sun, Partial sun

Duration of light: 6-8 hours daily

Quercus ilex thrives best in full to partial sun environments, getting 6-8 hours of sunlight daily. This aids in maintaining optimum growth conditions, supporting vigorous foliage development and structural strength.

What is the best type of sunlight for Quercus ilex? ›

How to achieve ideal lighting for Quercus ilex? ›

What are the benefits of ideal lighting for Quercus ilex? ›

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What Is the Ideal Temperature Range for Evergreen oak?

Ideal Temperature: 60 ~ 75℉

The ideal temperature range for Quercus ilex is between 60°F and 75°F. These temperatures allow for optimal growth conditions, promoting healthy leaf and bud development. Maintaining temperatures within this range ensures that the physiological processes are functioning efficiently, promoting photosynthesis and nutrient uptake.

What Soil is Best for Evergreen oak?

Soil type: Loam, Calcareous soil

Soil PH: 6.5 ~ 7.5

Quercus ilex thrives in well-drained soils that prevent water-logging which can lead to root rot. Adequate drainage ensures roots access oxygen necessary for healthy growth, promoting a robust root system. This oak species prefers moderately fertile soils to provide essential nutrients. A nutrient-rich substrate encourages lush foliage and enhances the tree's ability to resist pests and diseases. Though tolerant to dry conditions, Quercus ilex benefits from soils capable of retaining some moisture, ensuring the tree remains hydrated during prolonged drought periods, critical for enduring hot climates. More About Soil→

How to Fertilize Evergreen oak?

Fertilizer type: Balanced

For Quercus ilex, the right amount of fertilizer ensures robust health and growth. It's crucial to balance nutrients; typically, ½ pound of a balanced 10-10-10 formula is adequate mature tree for expansive growth. For young trees, scale to ¼ pound. Always circle the manner of dispersal around the tree's base, avoiding direct contact with the trunk. More About Fertilizing Techniques→

How to Prune Evergreen oak?

Pruning Time: Spring, Summer

Begin by identifying dead, diseased, or damaged branches, which are usually discolored or brittle. Removing these not only improves the tree's appearance but also enhances its overall health by preventing disease spread. Prune to shape the canopy by selectively thinning out branches to improve air circulation and light penetration. Focus on cutting back to a lateral branch or bud to maintain the tree's natural form and promote vigorous growth. Trim back to strong lateral branches to encourage new growth and maintain a balanced structure. This helps support the weight of the canopy and allows the tree to recover from pruning more effectively. More About Pruning Techniques→

How to Propagate Evergreen oak plant?

Propagate Time: Early spring, Late winter

Quercus ilex seeds, known as acorns, should be collected in autumn and stored in a cool, dry place. Before planting, soak them in water to determine viability; only those that sink are viable.

Before grafting, select vigorously growing stems from a healthy mother plant in late winter or early spring. Clean the area and use pruning shears to cut the scion and rootstock to fit snugly.

Fill seed trays with well-drained, sandy soil, placing viable acorns about one inch deep. Keep the soil moist but not waterlogged, ensuring the seeds have access to necessary warmth and humidity.

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How to Repot Evergreen oak plant?

Repotting frequency: Every 2-3 years

Repot your Quercus ilex when it shows evident signs such as roots protruding from the drainage holes, soil compacted and hardened, or if the plant's growth appears stunted and lackluster. These indicators suggest the need for a larger pot to give the roots more space and nutrients to thrive.

Choose a pot that is one size larger than the current pot, focusing on one with excellent drainage capabilities. A healthy balance of width and depth will ensure the roots have enough room to spread while enhancing water drainage. The right pot minimizes water retention, preventing root rot and promoting healthier growth.

Opt for a well-draining loam soil mixed with sand or perlite to improve aeration and ensure water doesn't linger around the roots for longer than needed. This soil composition mimics the natural habitat of Quercus ilex, offering the best environment for it to acclimate and grow robustly.

Toxicity of Evergreen oak

Is Evergreen oak toxic to humans?

The evergreen oak has a moderate toxicity level for humans, as every part of the plant can be harmful if ingested. The toxicity primarily stems from the presence of ricin, a highly potent toxin. In cases where any part of the evergreen oak is consumed accidentally, individuals may endure severe symptoms such as abdominal pain, vomiting, diarrhea, and potentially more serious repercussions affecting the nervous system. Since the entire plant is toxic, it is wise to exercise caution to avoid accidental ingestion, especially among groups that may encounter evergreen oak in their natural surroundings.

Is Evergreen oak toxic to cat?

Evergreen oak possesses moderate toxicity to cats, leading to the risk of poisoning if any part of the plant is ingested inadvertently. All sections of this plant are harmful, posing a potential danger for both indoor and outdoor felines that may encounter it. If a cat ingests any portion of evergreen oak, it may display various signs of physical discomfort or illness. The toxic properties of this plant stem from the presence of ricin. Therefore, it is essential for cat owners to remain alert and protect their pets from consuming evergreen oak. Should there be any suspicion of poisoning, seeking immediate veterinary assistance is vital to safeguard the health and well-being of the affected cat.

Is Evergreen oak toxic to dog?

The evergreen oak presents a moderate toxicity risk to dogs. These animals may inadvertently consume various parts of the plant, which can result in potential poisoning. If a dog ingests any section of the evergreen oak, they may display symptoms that signify poisoning. Such symptoms may involve vomiting, diarrhea, abdominal discomfort, and more severe manifestations such as tremors or seizures, contingent on the amount consumed. The plant as a whole is regarded as toxic, necessitating that it be kept away from pets. Should a dog ingest evergreen oak, it is crucial to seek prompt veterinary attention to ensure the best possible outcome for the animal.

WARNING

The judgment on toxicity and danger is for reference only. We DO NOT GUARANTEE any accuracy of such judgment. Therefore, you SHALL NOT rely on such judgment. It is IMPORTANT TO SEEK PROFESSIONAL ADVICE in advance when necessary.

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