Japanese Cypress (Tree)
Description
The Japanese cypress (Chamaecyparis obtusa), known as “Hinoki” in Japan, is an evergreen coniferous tree belonging to the family Cupressaceae. It features soft, scale-like leaves arranged in flattened sprays and small, spherical cones. Japanese cypress is highly valued for its aromatic, rot-resistant timber, which has been used for centuries in the construction of temples, shrines, and traditional baths. The tree’s pleasant fragrance and beautiful grain make it one of the most prized building materials in Japanese architecture.
Allergy Symptoms
Japanese cypress pollen commonly causes:
- Sneezing and runny or congested nose
- Itchy, watery, and red eyes
- Coughing and throat irritation
- Wheezing and exacerbation of asthma symptoms
Approximately 70% of individuals with Japanese cedar (sugi) pollinosis also experience symptoms during the Japanese cypress pollen season due to significant cross-reactivity between the two pollen types. This means sufferers often experience an extended allergy season from February through May as cedar is followed by cypress pollination.
Typical Pollination Period
Japanese cypress trees typically release pollen from March through early May, immediately following and overlapping with the Japanese cedar pollination season. Peak pollen dispersal usually occurs in April. This timing effectively extends the allergy season for those affected by both related pollens.
Geographic Distribution
Japanese cypress trees are primarily found in:
- Japan: Native and widely cultivated throughout the country, particularly in central and western regions
- Other regions: Planted in parts of East Asia for timber production and occasionally in temperate regions worldwide for ornamental purposes
Tips for Reducing Exposure and Managing Allergies
- Monitor local pollen forecasts and limit outdoor activities during high pollen days
- Keep windows closed and use air purifiers with HEPA filters indoors
- Shower and change clothes after spending time outdoors
- Use antihistamines or nasal corticosteroids as recommended by a healthcare professional
- Be aware that Japanese cypress season follows Japanese cedar season, extending the period of potential symptoms
- Wear masks and glasses outdoors during peak pollen periods
- Consider allergy testing and immunotherapy for persistent or severe symptoms