Japanese Cypress (Tree)
Description
The Japanese cypress (Chamaecyparis obtusa), known as “Hinoki” in Japan, is an evergreen conifer in the family Cupressaceae. It has soft, scale-like leaves arranged in flattened sprays and small, spherical cones. Japanese cypress is prized for its aromatic, rot-resistant timber, which has been used for centuries to build temples, shrines, and traditional baths. The pleasant fragrance and beautiful grain make it one of Japan’s most valued building materials.
Allergy Symptoms
Japanese cypress pollen causes:
- Sneezing and runny or congested nose
- Itchy, watery, red eyes
- Coughing and throat irritation
- Asthma flare-ups and wheezing
About 70% of people with Japanese cedar (sugi) allergies also react to Japanese cypress pollen because of cross-reactivity between the two. This means sufferers often have an extended allergy season from February through May as cedar is followed by cypress.
Typical Pollination Period
Japanese cypress releases pollen from March through early May, immediately following and overlapping with Japanese cedar season. Peak pollen dispersal is usually in April. This timing extends the allergy season for people affected by both related pollens.
Geographic Distribution
Japanese cypress trees are found mainly in:
- Japan: Native and widely cultivated, particularly in central and western regions
- Other regions: Planted in parts of East Asia for timber and occasionally in temperate regions worldwide as an ornamental
Tips for Allergy Sufferers
- Check pollen forecasts and limit time outdoors when counts are high
- Keep windows closed and use HEPA air purifiers
- Shower and change clothes after being outside
- Antihistamines or nasal corticosteroids can help — ask your doctor
- If you have cedar allergies, expect symptoms to continue through cypress season
- Wear masks and glasses outdoors during peak periods
- For persistent symptoms, consider allergy testing or immunotherapy