Organic Japanese Kuwa Matcha Mulberry Leaf Powder 40g (Clearspring). Organic Japanese Kuwa Matcha - Caffeine Free Mulberry Leaf Powder Kuwa is Japanese for mulberry and Matcha is Japanese for powdered tea. Just like traditional Matcha, Kuwa Matcha is a vibrant green, finely ground powder which has been widely enjoyed in Japan for centuries. Instead of tea leaves, it is made using mulberry leaves and unlike green tea Matcha, it is naturally caffeine free. Clearspring Organic Japanese Kuwa Matcha is made using the finest quality organic and sustainably grown mulberry leaves that are grown in Kagoshima, Japan, where volcanic soils and humid climates make for ideal growing conditions. Once harvested the leaves are steamed.