Don't Buy Tatami Mats Until You Know How They Are Made

Did you know that over 1,000 years ago, the Japanese created a special grass mat still used today? This is tatami, an iconic symbol of the traditional Japanese home. These mats offer a pleasant natural scent and the ability to absorb and regulate humidity, keeping rooms cool in summer and warm in winter. Notably, room sizes in Japan are often measured by the number of tatami mats instead of square meters. But few realize that crafting a tatami mat takes nearly a year of nurturing special grass in flooded fields. After harvest, the grass undergoes mud coating, drying, sorting, weaving, and assembly with extreme precision. How does grass become famous Japanese tatami? Let's find out. The journey begins with preparing agusa, the special grass used for the traditional tatami Healthy seedlings are selected, divided into small clusters, and planted in nursery trays. Around November each year, these seedlings are moved to flooded fields for planting. This grass is primarily cultivated in Kumamoto, the hub of Japan's agusa production. Today, planting is done by specialized machines, ensuring each cluster is placed quickly and uniformly. Watching the machine move through the mud, many might easily mistake this for a rice field. After the machine finishes, farmers inspect and fill in gaps to ensure even distribution across the field. Once planted, the agusa grass requires months of careful maintenance. In spring, as stalks grow rapidly, farmers use specialized machines to trim the tops across the field, ensuring uniform growth and high-quality raw material. To prevent the two-meter stalks from collapsing in wind or rain, wire and net systems are set up. They act as giant supports, keeping the grass standing tall. After seven to eight months of care, the agusa grass is ready for harvest. Harvesting typically occurs in late June or early July, when the quality is at its peak. Because Japanese summers are hot, farms often start as early as 3 a.m. to avoid the heat. Today, harvesting is mostly mechanized to increase speed and significantly reduce manual labor. In one pass, the machine cuts, collects, and binds the grass into bundles, saving immense time compared to manual methods. Each bundle is kept straight, as the quality of the agusa directly affects the durability and beauty of the tatami. The harvested agusa passes through high-pressure water jets to remove any dirt or impurities. Once cleaned, the agusa undergoes a unique and essential process. The bundles are dipped into a specialized mud mixture prepared for material treatment. Within moments, the stems are completely coated in a dark, gray mud. The bundles are then lifted to allow the mud to set evenly before the next stage. This is considered one of the most vital steps in traditional tatami production. The mud does more than coat the material, it acts as a natural protective layer for the agusa. During drying, this layer helps prevent the stems from breaking, protecting the structure and ensuring the flexibility needed for weaving. Furthermore, the mud helps maintain the agusa's natural color, ensuring the finished grass has a signature golden-green hue rather than dulling over time. Many in the industry also believe this step helps lock in the grass's natural fragrance. This subtle scent has become a defining characteristic of traditional Japanese tatami mats. After the mud bath, the bundles pass through a machine to remove excess mud. Only a thin, even layer remains before the material enters large drying ovens. This step removes moisture, enhancing the grass's durability and shelf life. Once fully dry, workers perform a final cleaning to remove dust and residual mud. The material is then baled and sealed for storage before reaching the workshops. Upon arrival at the workshop, the agusa undergoes a careful sorting process. Workers inspect each bundle, removing any bent, broken, or substandard stems. The tips are trimmed to ensure uniformity in length and overall quality. During this stage, a light mist is sprayed to maintain optimal moisture, ensuring the agusa remains supple and preventing damage during processing. Only the finest quality strands are selected to produce tatami mats. Creating a tatami surface requires thousands of carefully selected agusa strands. Though mechanized, workers still visually inspect each bundle for bent, broken, or uneven stems before production begins. Next, the raw materials are moved to the weaving area. Thousands of agusa strands are loaded onto automatic looms to form the signature surface. Workers monitor and adjust the weave, ensuring the strands remain uniform and secure. For premium products, a traceability tag is attached during production. These tags detail the agusa origin, producer info, and product ID for verification. Today, automatic looms have significantly boosted efficiency in modern tatami production. However, before this technology, all tatami surfaces were woven entirely by hand. Craftsmen meticulously arranged each strand on handlooms, requiring immense patience and skill. Once weaving is complete, the surface mat is cut to the required size. Yet the process continues, workers inspect every mat to ensure top quality before assembly. Using their keen eye, they scan the surface for minor flaws like misaligned strands, uneven coloration, or any defects that occurred during weaving. Though minor, these imperfections could compromise the product's final aesthetics. Then, excess edges are carefully trimmed with specialized tools for clean, sharp lines. Certain areas are also manually adjusted to ensure a consistent and beautiful weave. Only after passing this check does the mat move on to final assembly. While the agusa surface is finished, the tatami core is produced in parallel. This internal layer defines the mat's thickness, stability, and comfort. Following traditional methods, the core consists of multiple layers of dried rice straw. The straw is carefully stacked layer by layer to maintain uniform thickness throughout. This stage demands precision, uneven layering could cause the finished tatami to warp. Once layered, the straw block is compressed and secured with sturdy stitching. This process binds the straw layers into a solid unit, creating the tatami's signature resilience. The core provides a cushioned feel underfoot while offering natural insulation and soundproofing. Historical records indicate tatami first appeared in Japan over a thousand years ago. Originally, it was a luxury item reserved for palaces and the residences of nobility. Back then, tatami didn't cover entire floors, but served mainly as mats for sitting or resting. The earliest mats were crafted from locally available grasses, rushes, and natural materials. Over centuries, the Japanese refined their manufacturing techniques and improved material selection. Agusa grass became the standard surface material for its long, uniform stalks ideal for weaving. Today, despite modernized production, tatami remains a cultural icon of Japanese architecture. Once the core is ready, the woven agusa surface is carefully positioned on top. This is a critical stage, as two separately crafted components are merged into one product. Craftsmen measure both the core and surface beforehand to ensure they fit perfectly together. The surface is then smoothed and meticulously aligned so the weave remains centered. Even a slight misalignment could leave uneven edges or compromise the final aesthetic. Once perfectly aligned, the craftsman begins securing the surface to the core with initial stitches. In traditional workshops, artisans use heavy-duty needles to pierce through the surface and thick core. The task requires experience and strength, as each stitch must be firm to bind the layers. After being pre-stitched, the tatami passes through specialized machinery to reinforce the entire structure, blending manual skill and modern technology to bind the surface and core into a single unit. Once the frame is set, traditional fabric borders are sewn along the edges of the mat. Beyond aesthetics, these borders protect the edges from wear and damage during daily use. The border is carefully stitched and reinforced to enhance the product's overall durability. In the final stage, the entire surface of the tatami undergoes a thorough inspection. Loose threads are trimmed, minor flaws are addressed, and the surface is cleaned before shipping. Once complete, the tatami mats are shipped to buildings or homes for final installation. More than just flooring, tatami is a vital part of Japanese life and culture. For centuries, tatami rooms have hosted guests, tea ceremonies, and traditional rituals. Even today, they remain common in homes, temples, ryokans, and tea rooms across Japan. With proper care, a single tatami mat can last for years or even decades. When the surface wears, the agusa cover can be replaced without replacing the entire mat. Tatami is also eco-friendly, using natural materials like agusa and straw to reduce waste. From fields to homes, tatami is a craft icon that has defined Japan for over 1,000 years. This concludes our journey into tatami production. Thank you for watching.