How Does Japanese Mint Differ from Common Mint?

In short: Japanese mint (Mentha arvensis) usually yields oil with more menthol, has larger leaves and sturdier stems, and is grown mainly for distillation. Common mints such as spearmint have a milder aroma and are used as fresh herbs. When choosing a variety for oil, compare documented planting material, leaf yield and oil analysis rather than names alone.

“Japanese Mint” Is Not Necessarily a Botanical Name

The term “Japanese mint” may be used commercially to refer to a particular plant variety or line. However, this name alone is insufficient to establish the plant’s exact species, geographical origin or essential oil composition.

Before comparing it with common mint, verify the scientific name, planting-material source and documentation for each sample. Until this information is available, “Japanese mint” should be treated as a commercial designation requiring verification.

Key Criteria for Comparison

1. Identity and planting-material source: Check the supplier, planting-material batch records and propagation method.
2. Morphology: Record leaf shape, size and colour, stem characteristics, aroma and flowering time. Morphological traits can support identification but may not be sufficient to confirm a particular variety.
3. Growth performance: Monitor survival rate, biomass, regrowth after harvesting and consistency across growing seasons.
4. Essential oil quality: If the crop is intended for oil production, measure oil recovery and analyse chemical composition. Aroma and leaf volume alone are insufficient indicators.
5. Economic performance: Calculate the costs of planting material, crop maintenance, water, nutrients, harvesting and initial processing, alongside the value of raw material that meets buyer specifications.

How to Conduct Trials Before Expanding Production

Trial plots can be established under comparable cultivation conditions, using consistent recording procedures and the same harvest criteria. Yield comparisons require standardized area, measurement period and raw-material moisture content. Essential oil comparisons require the same distillation method and analytical approach.

Results from a single growing season should be considered preliminary data, not conclusive evidence of long-term superiority.

Conclusion

Differences between mint varieties should be established through planting-material documentation and controlled trials. This provides growers with a sound basis for selecting varieties that suit their production objectives rather than relying on commercial names alone.

Further reading

• Asian mint, peppermint and hung lui
• SW88 Japanese mint variety
• When to harvest mint for oil quality