Ashitaba

Angelica keiskei is endemic to the Izu Islands and the Boso Peninsula of Japan.

• Native to Hachijō-jima, Mikurajima, and other islands in the Izu archipelago south of Tokyo
• Also found on the Boso Peninsula in Chiba Prefecture
• Grows in the warm, humid, coastal climate of these Pacific islands
• Found at elevations from sea level to approximately 500 meters
• Has been used in traditional Japanese medicine for centuries
• First described by the Japanese botanist Gen-ichi Koidzumi in 1930
• The species epithet "keiskei" honors the Japanese botanist Ito Keisuke
• The Izu Islands have a long history of residents reportedly living to exceptional ages, attributed in part to ashitaba consumption
• Now cultivated commercially on a small scale in Japan, Korea, Taiwan, and the United States

A robust, perennial herb growing 50 to 120 cm tall.

Roots:
• Thick, fleshy taproot, aromatic

Stems:
• Erect, stout, green to purplish, hollow, branched
• 1 to 2 cm in diameter at the base
• When cut, exude a bright yellow sap rich in chalcones

Leaves:
• Large, bi- to tripinnate, 30 to 60 cm long
• Leaflets dark green, ovate, 5 to 10 cm long, with serrate margins
• Sheathing leaf bases (characteristic of Apiaceae)
• Glossy, slightly thick and succulent
• Strong, celery-like aroma when crushed

Flowers:
• Small, white to greenish-white, in large compound umbels
• Umbels 10 to 20 cm across, with 15 to 30 rays
• Five tiny petals per flower
• Blooms in the second or third year

Fruit:
• Small, flattened schizocarp, 4 to 6 mm long
• splits into two mericarps when mature
• Contains a single seed per mericarp

Angelica keiskei is a robust perennial herb endemic to a small group of volcanic islands south of Tokyo, where it occupies a specialized niche in coastal cliff communities and is deeply embedded in the traditional ecology of the Izu Islands.

Habitat and Distribution:
• Endemic to the Izu Islands (Hachijo-jima, Mikurajima, and others) and the Boso Peninsula of Japan
• Found on coastal cliffs, in moist ravines, and along forest margins on volcanic islands
• Occurs at elevations from sea level to approximately 500 meters
• Thrives in the warm, humid, maritime climate of these Pacific islands
• Prefers rich, moist, well-drained volcanic soils in partially shaded positions

Growth and Regeneration:
• Perennial herb growing 50 to 120 cm tall
• Remarkable regenerative ability \u2014 new leaves regrow within 24 hours of harvesting
• The plant can continue producing leaves for 3 to 5 years before flowering
• After flowering (typically in the second or third year), the plant may die
• Regenerates from seed in natural populations

Ecological Role:
• Contributes to cliff and ravine vegetation stability on volcanic islands
• Large compound umbels provide nectar for diverse insect pollinators
• Yellow sap containing chalcones may serve as a chemical defense against herbivores
• Part of the unique island endemic flora of the Izu archipelago

Pollination:
• Large compound umbels (10 to 20 cm across) attract diverse pollinators
• Visited by bees, flies, beetles, and butterflies
• Both self-pollination and cross-pollination occur'L, NULL, 'Ashitaba is exceptionally rich in unique bioactive compounds.

• Per 100 g fresh leaves: approximately 25 to 35 kcal
• Contains vitamins A, C, E, K, and B vitamins including B12 (unusual for a plant)
• Rich in minerals including potassium, calcium, iron, and magnesium
• UNIQUE: contains chalcones (4-hydroxyderricin and xanthoangelol) — potent antioxidant and anti-inflammatory compounds found almost exclusively in ashitaba
• Contains coumarins, flavonoids, and various phenolic compounds
• Good source of dietary fiber
• The yellow sap contains the highest concentration of chalcones
• Rich in chlorophyll and various carotenoids
• The chalcones are being studied for anti-cancer, anti-diabetic, and anti-obesity properties

Propagated by seed or by root crown division.

• Seeds: require cold stratification for 2 to 4 weeks before sowing
• Sow seeds in moist, well-draining medium; germination in 15 to 30 days
• Seedlings grow slowly; transplant to permanent location when 10 to 15 cm tall
• Root division: divide established plants in spring, ensuring each section has growing buds
• Space plants 40 to 60 cm apart
• Prefers rich, moist, well-drained soil with plenty of organic matter
• pH 6.0 to 7.0 is ideal
• Requires partial shade — direct afternoon sun can scorch the leaves
• Consistent moisture is critical; do not allow soil to dry out
• Mulch heavily to retain moisture
• Harvest individual leaves as needed — they regrow rapidly
• Perennial; productive for 3 to 5 years before the plant flowers and may die
• Protect from frost in cold climates

Culinary uses:
• Young leaves are eaten fresh in salads, added to smoothies, or juiced
• Leaves can be dried and powdered for use as a dietary supplement
• Used in tempura — the leaves are dipped in batter and deep-fried
• Added to miso soup and noodle dishes in Japanese cuisine
• The stems are candied or used to make tea
• Fresh leaves have a slightly bitter, celery-like flavor with a pleasant crunch
• Chopped leaves are mixed into rice dishes
• The yellow sap is collected and used in health tonics and supplements
• Ashitaba tea is made from dried leaves and is popular in Japan as a health beverage
• Young stems can be peeled and eaten raw like celery