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KK Leaf
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KK Leaf
Improving the Planet
from the Ground Up
Who We Are
Based in Tsukuba, Ibaraki, KK Leaf Co., Ltd. operates at the intersection of scientific research and practical agricultural solutions. We’re not just cultivating healthier soil—we’re nurturing communities, preserving ecosystems, and securing our shared future by harnessing the power of soil microbiology.
Our Innovative Solutions
Managing Japan’s largest peony garden, with over 60,000 pesticide-free plants, restoring natural biodiversity and promoting ecological harmony through enhanced microbial activity.
- Producing "Thoroughbred Miho," a premium compost enriched with beneficial microorganisms using patented rapid composting technology (Patent No. 6427823).
- Providing comprehensive soil diagnostics and tailored agricultural consulting to promote optimal microbial health.
- Leading research collaborations focused on boosting soil quality, enhancing yields, and significantly reducing environmental impact through microbial innovations.
Cultivating nutrient-rich, sustainable produce including melons, sweet potatoes, corn, and tomatoes, supported by thriving microbial ecosystems.
Proven Results
Rapid Disease Resolution
Downy mildew outbreaks resolved within just one week, restoring crops rapidly even after severe weather impacts
Disease Resistance and Quality Enhancement
Sweet potatoes exhibited complete resistance to base rot disease, significantly extending shelf-life.Exceptional Yield Improvements
Zucchini yields increased over 300%
Tomato yields increased up to 150%, with notable improvements in sugar content
Watermelon yields nearly tripled, achieving up to 200% of conventional methods.
Rice yields surged to 137% – 212% of conventional farming averages, with enhanced rice quality and flavor ratings
Our Passion and Expertise
From Dr. Hiroichi Seki
With over three decades of frontline agricultural experience, Dr. Hiroichi Seki and our dedicated team have pioneered transformative solutions centered on microbiology, tackling complex agricultural challenges such as bacterial wilt and nematode infestations. Our proprietary enzyme-based fermentation technology rapidly rebalances soil microbiomes, creating healthier, more productive farmland in weeks rather than years.
BioSpectrum Control™ (BSC)
Microbes Leading the Way
Our groundbreaking BioSpectrum Control™ technology meticulously nurtures beneficial soil microorganisms, fortifying the soil’s natural defenses and drastically improving plant health. By cultivating a robust microbial community, BSC enables crops to thrive, reduces chemical dependency, and significantly diminishes environmental harm.
How KK Leaf Can Help You
For Organic and Sustainable Farmers
- Enhance your soil fertility and plant health by building vibrant microbial communities.
- Reduce or eliminate the need for chemical inputs through biological methods.
For Farmers Facing Soil and Disease Challenges
- Comprehensive diagnostics and microbial-driven strategies to effectively combat soil-borne diseases.
- Immediate implementation of composting and microbial techniques tailored to your specific needs.
For Communities and Organizations
- Collaborate to establish sustainable agricultural ecosystems leveraging local organic waste to foster beneficial soil microorganisms.
- Turn organic waste into a valuable resource, benefiting both local agriculture and environmental health.
The Power of our Soil
Peony Garden Tokyo
Since 1989, our 100% organic garden has delighted guests with tree peonies (botan) and stem peonies (shakuyaku)—both flourishing under our unique composting and enzyme farming methods.
Thoroughbred Compost Ecosystem Project
Since thoroughbreds use very little medicine in preparation for doping tests, the manure is considered to be high-quality organic matter, and a plan was put forward to turn it into branded compost and link it to the creation of local branded agricultural products.
In 2019, the compost was commercialized, sales began at home improvement centers, the number of compost houses was increased, and results and component analysis were also conducted.
For horse ranches, this solves the problem of horse manure disposal, and for farmers, it solves the problem of soil improvement and the creation of unique agricultural products.
Company Information
Company Name
Leaf Co., Ltd. (Life Earth Agriculture Future)
Head Office
500 Wakarugi, Tsukuba, Ibaraki
Tokyo Office
6F Marunouchi Mitsui Building
2-2-2 Marunouchi, Chiyoda-ku, Tokyo
President & CEO
Yoshio Narukage
Business Activities
Operation of Tsukuba Peony Garden
Japan’s largest collection (60,000 peony and herbaceous peony plants, company research)
Managed pesticide-free in a natural satoyama setting
Soil Improvement Services
Manufacture and sale of fully matured thoroughbred compost “Thoroughbred Miho”
Soil improvement diagnostics, rapid compost production (Patent No. 6427823), and consulting
Management of an R&D platform under the Ministry of Agriculture, Forestry and Fisheries for improving crop quality and yield through soil improvement, in collaboration with academia and industry
Thoroughbred Compost Ecosystem Project Research Consortium
Innovation Creation Research Consortium Using Microorganisms
Crop Production
Melon, sweet potato, corn, tomato, and other produce
Connect With Us
Join KK Leaf and become part of the microbial revolution.
Headquarters: 500 Wakaguri, Tsukuba City, Ibaraki Prefecture
Tokyo Office: Marunouchi Mitsui Building 6F, 2-2-2 Marunouchi, Chiyoda-ku, Tokyo
029-876-3660
Drop Us a Line
Work With Us
Join KK Leaf and be part of a mission to cultivate healthier soil, stronger ecosystems, and a more sustainable future. We’re looking for passionate, hands-on collaborators who care deeply about the land, the environment, and the animals we support. If you’re ready to make an impact, we’d love to hear from you.