Ring-cup oak
Quercus glaucafam. Fagaceae
Educational content — not medical, botanical, or professional advice. Always consult a qualified clinician before using any herbal preparation — especially during pregnancy, breastfeeding, while on medication, or for children. How we source & review →
Pl. E6C5 — Quercus glauca
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IOverview
Overview
Ring-cup oak (Quercus glauca) is a deciduous tree native to regions including China South-Central, Southeast, Japan, Nansei-shoto, Taiwan, and Assam in the East Himalaya. Known for its edible leaves and seeds, this plant thrives in moist environments with medium to heavy clay soil, preferring full or partial sun. It can grow up to 15 meters tall and is hardy in zones 8-9. Its distinctive feature lies in its light green, glaucous leaves and acorns that are encased in a cup-like structure, setting it apart from other oak species.
Quick answers
What is Ring-cup oak?
Ring-cup oak (Quercus glauca) is a deciduous tree native to regions including China South-Central, Southeast, Japan, Nansei-shoto, Taiwan, and Assam in the East Himalaya. Known for its edible leaves and seeds, this plant thrives in moist environments with medium to heavy clay soil, preferring full or partial sun.
What is Ring-cup oak used for?
Traditionally used for digestion, immune support. Each claim is evidence-rated — see Section II for full citations.
Best for
Top 2 evidence-ranked uses of Ring-cup oak
Clinicaluses · safety · chemistry · dosagemedicinal profile
IIBenefits & evidence
2 claims · 0 sources
Benefits & evidence
2 claims · 0 sources- Ring-cup oak is traditionally used in Chinese medicine to aid digestion, often prepared as a decoction. It may help alleviate digestive discomfort and support the overall health of the gastrointestinal tract.
The mechanism by which Ring-cup oak aids digestion is not fully characterised but may involve compounds such as tannins that can have an astringent effect on the gut lining, potentially reducing inflammation and irritation.
- Ring-cup oak has been traditionally used in Chinese medicine to support immune health, often prepared as a decoction. Its use is based on the belief that it can help maintain overall well-being during seasonal changes.
The mechanism by which Ring-cup oak supports immune function is not fully characterised but may involve bioactive compounds such as flavonoids and tannins, known for their antioxidant properties.
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.
Ring-cup oak support blend
generaltea
AI returned a direct ingredient list; normalized into one draft blend for editorial review.
Growingconditions · propagation · uses
VCultivation
Cultivation
Ring-cup oak thrives in full to partial sun and prefers moist soil that is medium or heavy (clay). It grows well in hardiness zones 8-9 and reaches a height of about 15 meters. For propagation, seeds can be used. Ensure the soil remains consistently moist but avoid overwatering to prevent root rot. This tree is native to regions including China South-Central, Southeast, Japan, Taiwan, Assam, North-Central China, and East Himalaya. Its leaves and seeds are edible.
Light
Full sun, Partial sun/shade
Water
Moist
Soil
Medium, Heavy (clay)
Hardiness
8-9
Mature size
15.0 m tall
For first-time growers
How to grow Ring-cup oak for the first time
7steps
Start with planting a young Ring-cup oak in your garden for a rewarding beginner project.
- 1
What you'll need
A young Ring-cup oak sapling, a spade, and some compost.
- 2
Best time to plant
Plant in early spring or late autumn when the soil is moist but not waterlogged.
- 3
Soil and container prep
Ensure the soil is well-draining with plenty of organic matter. For containers, use a mix of medium and heavy soil types.
- 4
Sowing or transplanting
Transplant the sapling carefully, ensuring the root ball remains intact.
- 5
First two weeks
Water regularly to keep the soil moist but not soggy. Monitor for signs of stress such as wilting.
- 6
Ongoing care
Provide full sun or partial shade and water when the top inch of soil feels dry. Prune lightly in late winter to maintain shape.
- 7
Harvest or pruning
Prune young branches in late winter to encourage a strong structure. Leaves can be collected for use but are not typically harvested.
VIEdible & utility
Edible & utility
Edible parts:LeavesSeed
Edible uses: Coffee
Other uses:Fire starterTanninLumber
Contextrange · companions · related
VIIDistribution
16 native · 0 introduced
Distribution
16 native · 0 introducedDistribution across1 continent· 16 native
Asia9 regions
native (9)ChinaIndiaJapanLaosMyanmarNepalSouth KoreaTaiwanVietnam
Broader regions
native:Nansei-shoto, East Himalaya, Hainan, West Himalaya
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 (Fagaceae), common use cases, and growing requirements.
same family · Fagaceae
Botanical relatives — often share phytochemistry + growing needs.
shared use cases
Different families, similar therapeutic role — good for comparing.
XI
Explore further
Companion planting
Health goals
Compare with similar plants
Growing zone
XII
About this entry
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- Citation
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