Blackjack Oak
Quercus marilandica
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Pl. EBC5 — Quercus marilandica
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IOverview
Overview
Blackjack Oak (Quercus marilandica) is a deciduous tree native to the eastern and central United States. It thrives in habitats ranging from Alabama to Virginia, with notable presence in states like Florida, Georgia, Illinois, Indiana, and Kentucky. Known for its edible acorns, which are enjoyed by wildlife and sometimes used in human cuisine, this oak also serves as an ornamental tree due to its distinctive bark and foliage. One of its key features is its ability to grow well in a variety of soil types, from medium to heavy clay, with a preference for light conditions that range from full sun to partial shade. It can reach heights of 10 meters and is hardy in zones 6-9, making it adaptable to different climates within its native range.
Quick answers
What is Blackjack Oak?
Blackjack Oak (Quercus marilandica) is a deciduous tree native to the eastern and central United States. It thrives in habitats ranging from Alabama to Virginia, with notable presence in states like Florida, Georgia, Illinois, Indiana, and Kentucky.
What is Blackjack Oak used for?
Traditionally used for immune support. Each claim is evidence-rated — see Section II for full citations.
Best for
Top 1 evidence-ranked use of Blackjack Oak
Clinicaluses · safety · chemistry · dosagemedicinal profile
IIBenefits & evidence
1 claim · 0 sources
Benefits & evidence
1 claim · 0 sources- Blackjack Oak, like other oak species, has been traditionally used in Native American medicine to support immune health. A decoction made from the bark may help bolster the body's defenses against common ailments.
The tannins and flavonoids found in Blackjack Oak bark are thought to have antimicrobial properties that can help protect against pathogens, though the specific mechanisms are not fully characterised.
IV·bMixology suggestions
1 draft
Mixology suggestions
1 draftEditorial drafts. These pairings are AI-suggested from traditional herbal lore. Always verify with a qualified herbalist before brewing.
Blackjack Oak support blend
generaltea
AI returned a direct ingredient list; normalized into one draft blend for editorial review.
Growingconditions · propagation · uses
VCultivation
Cultivation
Blackjack Oak thrives in full to partial sun and prefers well-drained to moist soils with a pH between 4.6 and 5.6. It is hardy in zones 6-9 and can grow up to 10 meters tall. For cultivation, plant the tree in medium to heavy clay soil and ensure it gets plenty of light. Water regularly but avoid overwatering, as it prefers dry conditions. Propagate via seed for best results. SKIP
Light
Full sun, Partial sun/shade
Water
Dry, Moist
Soil
Medium, Heavy (clay)
Hardiness
6-9
Habit
Tree, Shrub
Mature size
10.0 m tall
Soil pH
4.6–5.6
For first-time growers
How to grow Blackjack Oak for the first time
8steps
Start with Blackjack Oak as a simple, low-maintenance tree for beginners.
- 1
What you'll need
Blackjack Oak seeds or young saplings, garden gloves, trowel.
- 2
Best time to plant
Plant in spring after the last frost or fall before the first freeze.
- 3
Soil and container prep
Choose a well-draining spot with soil pH between 4.6-5.6; loosen the soil to about 30 cm deep.
- 4
Sowing or transplanting
Direct sow seeds in fall or stratify them for spring planting; plant young saplings any time of year.
- 5
First two weeks
Water regularly, keeping the soil moist but not waterlogged. Monitor for pests and diseases.
- 6
Ongoing care
Provide full sun to partial shade; water when dry; mulch around the base to retain moisture.
- 7
Harvest or pruning
Prune in late winter before new growth starts to maintain shape and remove dead branches.
- 8
Common mistakes
Overwatering, planting in heavy clay soil, neglecting mulch application, not providing enough sunlight.
VIEdible & utility
Edible & utility
Edible parts:Seed
Edible uses: Coffee
Other uses:Fire starterTanninLumber
Contextrange · companions · related
VIIDistribution
27 native · 0 introduced
Distribution
27 native · 0 introducedDistribution across1 continent· 27 native
Asia1 region
native (1)Georgia
Broader regions
native:Arkansas, Delaware, District of Columbia, Florida, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maryland, Mississippi, Missouri, New Jersey, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, South Carolina, Tennessee, Texas, Virginia, West Virginia, Alabama, Nebraska
IXSpecimen gallery
1 image
Specimen gallery
1 imageXSee also
8 related
See also
8 relatedPlants you might compare or use together — scored by shared family, common use cases, and growing requirements.
shared use cases
Different families, similar therapeutic role — good for comparing.
XI
Explore further
Companion planting
Compare with similar plants
Growing zone
XII
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