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Basic Information of Japanese Tea and OSADA TEA

Tea is said to have been brought to Japan 1200 years ago. Since then, until the mid-20th century, when modern agriculture flourished, organic farming was naturally pesticide-free and chemical-free.The concept of organic farming was devised in 1971, and guidelines were established in 1992. Osada Seicha (Osada Tea Japan) began handling organic tea around 1990.


Suitable areas for tea cultivation are those with an average annual temperature of 14-16℃ or higher, a minimum winter temperature of -5-6℃, and a maximum summer temperature of no higher than 40℃. Rainfall should be moderate from February to April and from mid-July to early September after the end of the rainy season, with an annual precipitation of about 1,500 mm.The topsoil should be rich and well drained, and the soil should be slightly acidic. Tea produced in areas where there is a clear difference in temperature between day and night is of superior quality.


The area of tea harvested in 2021 is 25,300Ha and is on a declining trend. However, production efficiency has increased and there is no significant change in tea production yield. Due to changing tastes, the domestic consumption is on declining trend and, small-scale farmers cannot invest to increase production efficiency. This is thought to be the main reason for the declining trend in harvested area. Large-scale farmers are increasing and practicing organic farming methods.


It is said that more than 1,500 mm of precipitation is required annually for tea cultivation, especially more than 1,000 mm during the growing season from March to October. The moisture required by tea is retained and used by the soil. However, because of evapotranspiration, more than 1,000 mm of precipitation per year is needed to cover it with rainfall. But considering the rate of flow over the surface, infiltration into the soil, and utilization by the tea plants, 1,500mm of precipitation per year is required to produce the tea. Especially in the case of heavy summer evaporation, a lot of soil moisture is required, and if the number of days without rainfall exceeds 20 days during this period, drought will be a factor. High rainfall can retain water if it is within the soil's tolerance, but drought is likely to be fatal if it continues for a long period of time.

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Based on 9 reviews
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Smooth like silk on the palate. The scent of the roasted rice and matcha intemingling like the finest fragrance.

Excellent sencha. I did not taste any bitterness at all.

Glad I stumbled on this shop

I love that it’s organic and the pricing of the items is great. Enjoyed the tea. Fast shipping and very nicely packaged!

We're so glad you like our tea. We are a store that specializes in Japanese organic tea. We hope you can find the Japanese tea you want at the right price and the taste you prefer in our online store.

Highly recommend

Great flavor and aroma, highly recommend.

Thank you for your valuable review. :)

Highly recommend

Great flavor, aroma, and color (smells and looks fresh). Fast shipping and thoughtful packaging. Thanks!

Thank you very much for your valuable review. Thanks for enjoying our package. :)

My favourite

The taste is balanced And not too bitter

Thank you so much for sharing your taste review. :)

Balanced of sweetness and bitterness

This one is the perfect balance of sweetness and bitterness for me. I am not fan of bitterness of tea but this combination of sweetness and little bitt of bitterness makes me feel energetic. I smell and taste the freshness with every sip in the morning. it contains 20 grams I feel the quantity is not too much. So now I wanna try their other matcha to compare.

Hello, Amber.
Thanks for leaving a thoughtful review about our matcha.

My Favorite Matcha

I have used this Koiai matcha for 3 years now since my Japanese friend recommend. I love it! It is the best I have tasted. It's fresh and nutty as well. I used to drink coffee every morning but now I make my own Matcha lattes at home. It is very dense because it is high quality ceremonial matcha so make sure you sift matcha for creamy and foaming.

Thank you for loving KOIAI Matcha. We will share this great review with our farmers. Thank you again.

Lacking customer service

I reached out twice to Osada Tea regarding my tea order, once before I bought the tea and once after regarding the discount that I did not apply and the first time a question about radiation. I never heard from anybody on either of my questions. Also the tea that I ordered tastes really bad and I don’t know why but I just can’t drink it so I was a bit of a waste of money for me and I will not be re-ordering