Blackjack Oak
Quercus marilandica
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Description
Blackjack Oak is a small to medium-sized deciduous tree native to the central and eastern United States. It typically grows in poor, dry, sandy, or clay soils, often in association with other oak species. The tree is recognized for its distinctive leathery leaves with three lobes and a bristle-tipped apex. In agroecology and regenerative agriculture, Blackjack Oak serves as a pioneer species, improving soil structure and fertility over time. It plays a crucial role in providing habitat and food for wildlife, including birds and mammals that consume its acorns. The tree is particularly valuable in ecological restoration projects due to its resilience in nutrient-poor soils. Historically, Blackjack Oak has been used by Indigenous peoples for its wood and acorns, which, after proper processing to remove tannins, can be used as a food source. In a food forest, it functions as a canopy layer, supporting biodiversity and acting as a windbreak.
Growing Details
Blackjack Oak thrives in well-drained, sandy, or clay soils and is highly drought-tolerant once established. It requires full sun for optimal growth and is often found in open woodlands or savannas. Propagation is typically through seed, which should be sown in the fall for natural stratification. To prepare the soil, incorporate organic matter to improve drainage and fertility. Mulching around the base helps retain moisture and suppress weeds. Companion plants include nitrogen-fixing species li
Tags
Carbon Farming
Attracts Wildlife
Fire Wood
Windbreak
Erosion Preventing
Visual Appeal
Range (Based on GBIF Data)
The map shows known occurrence points of <strong>Quercus marilandica</strong> recorded in scientific biodiversity databases.
Source: <a href="https://www.gbif.org" target="_blank">GBIF.org</a> โ Global Biodiversity Information Facility
Location & Timing
native geo location: Central and Eastern United States
applicable geo region: North America
language used: en
Flowering:
middle
of April for 30 days
Harvest:
middle
of September for 60 days
Seed Start:
?
Indoor Start:
Transplant:
Uses & Benefits
Edible Rating:
(2/5)
edible uses: The acorns of Blackjack Oak can be processed to remove tannins by leaching in water and then ground into flour. They are a valuable food source when prepared correctly, though their bitterness requires careful processing.
Medicinal Rating:
(2/5)
medicinal uses: The bark and leaves of Blackjack Oak have been used in traditional medicine for their astringent properties, particularly in treating skin conditions and diarrhea. However, these uses are not well-documented in modern herbal medicine.
health concerns: Acorns contain tannins, which can be toxic if consumed in large quantities without proper processing. Ensure thorough leaching before consumption.
other uses: The wood is dense and hard, making it suitable for firewood and occasionally for making charcoal. It is not commonly used for construction due to its irregular shape.
Scientific Literature
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Botanical data
specie: Quercus marilandica
common names: Blackjack Oak; Barren Oak; Jack Oak
family: Fagaceae
sub family:
tribe:
sub tribe:
genus: Quercus
Growing Conditions
area needed: 10.0 m
spacing: 5.0 m
growing difficulty: High
Deciduous / Evergreen: Evergreen
Seed Temp (Opt/Min/Max): 15ยฐC / 10ยฐC / 20ยฐC
Plant Temp (Opt/Min/Max): 20ยฐC / -5ยฐC / 35ยฐC
water demands: Low
humidity:
light demands: High
root type: Deep
frost tender:
hardness:
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(5/10)
first harvest: 20 years
life span: 150 years
succession: Pioneer
growth rate: Slow
max height: 15.0 m
max width: 12.0 m
soil preference:
Poor Soil
pH preference:
Neutral
flower type:
Monoecious
growth details: Blackjack Oak thrives in well-drained, sandy, or clay soils and is highly drought-tolerant once established. It requires full sun for optimal growth and is often found in open woodlands or savannas. Propagation is typically through seed, which should be sown in the fall for natural stratification. To prepare the soil, incorporate organic matter to improve drainage and fertility. Mulching around the base helps retain moisture and suppress weeds. Companion plants include nitrogen-fixing species li
Potential Disturbances: Blackjack Oak is relatively resistant to pests but can be affected by oak wilt and other fungal diseases. Natural pest management includes promoting beneficial insects like ladybugs and lacewings, which help control aphid populations. Companion planting with garlic or chives can help repel fungal pathogens. Neem oil can be used as an organic spray to manage minor infestations.
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