Meet The Tea Maker: Natsumi Osada

Japan is revered for its tea craft, with bold green teas and unique blends that are rich, grassy and full of umami, as well as being deeply aromatic. The highest quality examples of these teas are skilfully refined and use only the best leaves - carefully harvested and processed.
  • 02/01/2025
  • 9 minutes
  • blubolt team
Meet The Tea Maker: Natsumi Osada

We look inside a Japanese Green Tea Refinery with Tea Maker Natsumi Osada to see how our Organic Genmaicha is organically grown and produced. 

Japan is revered for its tea craft, with bold green teas and unique blends that are rich, grassy, full of umami, and deeply aromatic. The highest quality examples of these teas are skilfully refined and use only the best leaves - carefully harvested and processed. Our latest batch of Organic Genmaicha is one such tea, a traditional blend of warming, organic brown rice and spring-fresh sencha. So, I was excited to spend some time speaking to the people who helped create it and discover the story behind the craft.

Tea Maker Natsumi Osada in Marusen Isagawa tea gardens. 

Catching up on a video call, I met with the owner, Natsumi Osada, and product specialist, James Johnson of Osada Tea – the refinery team behind Organic Genmaicha. Speaking at the end of their busy summer flush season, there was much I was keen to discover - what life in the Japanese tea industry is really like, the future of organic tea in Japan and ultimately, what it takes to make great tea.

We begin with a cup of tea. As I settle in with a morning cup of Sencha, Natsumi and James, enjoy a caffeine-free herbal infusion as they finish up for the day. They're currently at the Osada tea factory HQ in Mori-Machi, nestled in the peaceful countryside of western Shizuoka, Japan. "As usual, we're here working every day until 7, 7:30 pm," says James with a smile.

A birds-eye view of the Marusen Isagawa tea gardens. 

Tea refineries play a vital role in the Japanese tea industry. That is because there are two stages of tea production in Japan. James explains the basics. First, the leaves are harvested at the tea garden and carefully part-processed by the farmers. This creates what's called aracha, which means 'crude' or 'half-finished' tea. The aracha is then sold to tea refiners, who craft a variety of finished teas using shiyage (refinery) processes, like leaf sorting, roasting, steaming, blending and drying. "Both the aracha and refinement are an art and a science," says James. For an even better understating, I'm whisked on a quick virtual tour of the building and refinery...

"Here at the HQ, we have tea appraising rooms, a dining hall, a meeting room and the shiyage (refinery) factory", explains James. "So it's kind of a combined office space and factory."

There's impressive machinery with many moving parts, but Osada is a humble family business with a team dedicated to expertly overseeing the operation. Natsumi married into the company and has worked as a tea refiner for 20 years. He also holds a 9th dan tea instructor certification. No mean feat. Gaining the initial certification takes years of study and tedious exams on everything from tea history to agriculture and economics. Natsumi certainly has a competitive spirit. In 2009, he won the National Japanese Tea Examination and Technology Competition and received the Minister of Agriculture, Forestry and Fisheries Award in successive years. James also passed the arduous tea instructor exam in 2021 – only the second American to do so - and I ask him what it takes,

Organic Japanese Green tea bushes growing in the garden in harmony with nature.

 "Tea instructors are the point of reference for correct information about Japanese tea. It's a big test, and it's not easy; many people don't even pass the first exam. But it was a fun process; my head felt so full every day. But even passing the exam is just a starting point; working in the industry, you see many things that you don't learn from a book - ways of saying things, talking to farmers, setting prices... real experience is important." 

James joined Osada a year and a half ago and has settled in the countryside, working at the refinery. I asked him how his current experience of Mori-Machi differs from life in the US.

"It's so different from how I grew up. Mori-Machi is full of nature, and the Ota River runs right through the centre of town." He says. In Japanese, they have the word 'shigeki,' which means stimulated. Even after a year and a half living here, it lifts me up while I cycle to work and back every day."

Organic tea minimises land, wildlife, producers, and consumers' to agrochemical exposure.

Often likened to a mini Kyoto, thanks to its beautiful setting and historic shrines, Mori-Machi is also well positioned for tea production. It's a short 30-minute drive straight north into the mountains of the Tenryu district, where many of Osada's partner tea gardens can be found. A further hour up into the high mountains, you reach the isolated Marusen Isagawa Cooperative gardens. A collective of organic tea farms surrounded by nature and sitting at 300m – 450m altitude. The organic green tea from the cooperative's spring and summer 2021 harvest was refined and blended for our latest batch of Organic Genmaicha. I ask head refiner Natsumi Osada about his work with the Isagawa tea farmers and how they choose their aracha during the busy season.

Roasting and sorting machines inside the refinery at Osada Japanese Green Tea.

"The style here is a little bit different from the rest of Japan. It's much more about negotiation and talking to the farmers," explains Natsumi. After plucking the leaf and making the aracha during the night, the farmers will bring us small batches at, usually, 4 or 5 in the morning. When we settle on a tea, they can get us the daikai (big bags) of aracha. We'll work from 4 a.m. to 9 p.m. during the busy season most days.” 

Working so closely with the farmers and nurturing their connection means that Natsumi can get first choice on the best teas as fresh as possible while continuing to support local, organic agriculture.

"A lot of tea from the local area will come to us. Around 70% of our teas are local and built off of good relationships with farmers. When they bring the samples, we always talk about cultivars, methods, and how their gardens are going. But I'll be honest with them about their tea. If something is not right, the taste or colour is off, I'll say so because we always want to build an honest relationship."

Once they receive the aracha James explains the rough shiyage (refining) process. The first step is to unload the heavy 3kg bags of leaves. "Then, an initial sorting machine will create uniform material before the leaves are sifted to separate the larger and smaller sizes. Once separated, the tea moves on to roasting, which can be hard or light depending on the taste profile and tea we want to create - black tea, matcha, kukicha, etc. We then separate the stems from the leaves using either static electricity or a CDC camera, which uses a laser to detect the thick stems and then shoots air to blow them from the leaf. It's an interesting process."

Tea leaf sorting machines in the refinery.

The conversation then turns to Organic Genmaicha, a classic blend of organic rice and steamed green tea. James tells me it's popular in Japan, and I'm curious to know more about what makes it so special.

"Genmaicha is really simple and approachable. It's just brown rice and Sencha, but it's a highly aromatic tea that'll fill the room." James tells me, "Frankly being American, I like things with heavier flavours, so when I'm tasting Sencha, I often think it's 'nice' but can be lacking in flavour; Genmaicha fills that need for flavour," He continues, "It's also versatile, you can make it with boiling water, you can cold-infuse it, or even add some matcha powder to it to bring out that green taste." Natsumi says, "We put a little more effort into our Genmaicha than the average producer. We make sure to get good rice and use the high-quality spring flush sencha; the process is very detailed."

JING Organic Genmaicha Green Tea. 

One important aspect of their Genmaicha is that it's certified organic. We often hear from producers that there is not much demand in the Japanese market for organic products. But James tells me that organic is something they're really interested in, which is why they partnered with the organic Isagawa Marusen cooperative. 

"The farmers have a know-how and an understanding after 30 years of doing this. There are even some young guys farming now, too. I think a lot of it comes down to nature and working with the seasons. It's a lot of monitoring and planning ahead for the next season. Because they're not using chemicals, they must be more keen on how nature reacts over time," says James.

A bird 's-eye view of the Marusen Isagawa tea gardens, where tea bushes are grown without pesticides or agrochemicals. 

Despite their knowledge and efforts, the farmers still face new challenges each year, and Natsumi is keen to explain the effects of climate change that he has been hearing.

"They tell me that yabukita, the main cultivar, is getting harder to produce because of climate change. With the rising temperatures, the tea leaves will start budding earlier than usual during the frost period, which can cause damage and be a problem for the new shoots." He explains, "But they're trying to make more use of different cultivars lately which can be used for different kinds of tea like Japanese style oolong,".

As we finish up our conversation, the two are hopeful that even though organic is "not such a big thing" for customers in Japan, the farmers love it, "It's what you're not putting in the tea that makes it tasty", James quips. As for tasty tea, I can't help but finish by asking them their favourite way to enjoy Genmaicha. James advises...

"Use a clay teapot, around 800ml with about 3g per person—as a good rule of thumb—and infuse for about 30 seconds, so fairly quickly. You want the water hot enough so the steam fills the room with the Genmaicha aroma."

Try JING Organic Genmaicha

  1. Organic Genmaicha
  2. One Cup Tea-iere 
  3. Temperature controlled Kettle 
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