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Bur Oak

Quercus macrocarpa

Identified By Marcs

Quercus macrocarpa, commonly known as the bur oak, is a species of oak native to North America, primarily in the eastern and central United States and south-central Canada. It is a large deciduous tree characterized by its massive trunk, expansive canopy, and distinctive large acorns encased in a mossy, fringed cup. The bur oak is exceptionally hardy and resilient, known for its ability to withstand urban pollution, drought, and severe windstorms. It plays a crucial ecological role by providing food and habitat for various wildlife species, including squirrels, birds, and deer. Historically, its durable wood has been utilized for construction, furniture, and shipbuilding. This magnificent tree is frequently planted in large parks and open landscapes as a prominent shade specimen.

Also known as: Mossycup Oak Mossycup White Oak

Toxicity & Safety

Is Bur Oak toxic to pets?

Yes, toxic to pets.

Bur oak trees contain large amounts of tannins in their leaves, twigs, green acorns, and mature acorns. When pets such as dogs or horses consume these parts, the tannins can cause severe gastrointestinal distress, including vomiting, diarrhea, loss of appetite, and abdominal pain. In more severe cases of massive ingestion, tannin poisoning can lead to kidney damage and failure. It is important to keep pets away from fallen acorns and leaves during autumn to prevent accidental poisoning. Veterinary attention should be sought immediately if a pet exhibits symptoms of oak toxicity after chewing on or swallowing parts of the tree.

Is Bur Oak toxic to humans?

Yes, toxic to humans.

The leaves, twigs, and acorns of Quercus macrocarpa contain high concentrations of tannins. While accidental ingestion of small amounts by humans, particularly children, usually only causes mild stomach upset, nausea, or constipation, consuming large quantities of raw, unprocessed acorns can lead to severe gastrointestinal irritation and potential kidney toxicity. Acorns must be properly processed, shelled, and leached to remove the bitter tannins before they can be safely consumed by humans. Direct contact with the plant parts does not typically cause allergic reactions or dermatitis, but internal consumption requires caution.

Is Bur Oak safe during pregnancy?

Generally considered safe during pregnancy.

Growth & Dimensions

Height 1500 - 3000 cm
Width 1000 - 2500 cm
Growth Rate Slow
Care Level Easy
Lifespan Perennial

Ideal Environment

Temperature -40°C - 35°C
Sunlight Hours 6 - 12 hrs/day
Sun Exposure Full sun
Soil pH 4.8 - 7.5
Watering Interval 10 - 21 days
Humidity 30.00% - 80.00%
USDA Zone 3a - 8b

North American Plains and Woodlands

Climate: Continental temperate climate with cold winters and warm summers, capable of enduring severe droughts and temperature fluctuations.

Soils: Clay Loam Sand
Annual Rainfall: 500 - 1200 mm

Native Regions

Eastern United States
Central United States
Southeastern Canada

How to Care for Bur Oak

How should I handle sunlight requirements?

Plant the bur oak in a location that receives full sun, ideally at least six to eight hours of direct sunlight daily, to ensure optimal canopy development and overall tree health.

How should I handle watering guidelines?

Water deeply during the first few years after planting to establish a strong root system. Once established, bur oaks are remarkably drought-tolerant and generally rely on natural rainfall, requiring supplemental water only during extended dry spells.

How should I handle soil and fertilization?

Thrives in deep, fertile, well-draining soils but is highly adaptable to clay, loam, or sandy soils. Fertilization is rarely necessary unless a specific nutrient deficiency is diagnosed in the surrounding soil.

How should I handle pruning practices?

Prune during the dormant winter season to remove dead, diseased, or crossing branches. Avoid heavy pruning in the spring to prevent attracting insect pests that can transmit diseases like oak wilt.

How to Propagate Bur Oak

How to propagate Bur Oak by seed?

Collect mature acorns in autumn, plant them directly into the ground or containers while fresh, as they do not store well, and provide protection from rodents until germination occurs in spring.

Common Diseases & Pests of Bur Oak

What is Oak Wilt and how is it treated?

Fungal
Symptoms:

Rapid wilting, browning of leaves starting from the outer edges, premature leaf drop, and vascular discoloration beneath the bark.

Treatment:

Remove and destroy infected trees immediately, trench around infected areas to stop root grafts, and apply fungicides as a preventative measure.

Prevention:

Avoid pruning oak trees during the active growing season when sap beetles are active, and sterilize pruning tools between cuts.

What is Powdery Mildew and how is it treated?

Fungal
Symptoms:

White or gray powdery fungal growth on the upper and lower surfaces of leaves, leading to distorted foliage and early leaf drop.

Treatment:

Apply appropriate sulfur- or copper-based fungicides and clear away fallen infected leaves in autumn.

Prevention:

Ensure proper spacing and air circulation around the tree canopy and avoid overhead watering.

Properties & Benefits of Bur Oak

Bears Fruit

Uses & Health Benefits

What are the benefits of environmental shade and air quality in Bur Oak?

The massive canopy of the bur oak provides extensive shade, reduces urban heat island effects, and helps filter airborne pollutants, improving local air quality.

What are the benefits of traditional wood uses in Bur Oak?

The dense, durable timber has historically been used for heavy construction, cabinetry, flooring, and boat building due to its rot-resistant qualities.

Key Nutrients / Compounds

Tannins rich in High concentration in bark, leaves, and acorns

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