20-30 Days to maturity. Perilla frutescens. Organic Red Shiso Microgreen Seeds. Red microgreens are different in color than other microgreen varieties. Red Shiso microgreens have a delicious herby and distinct flavor to them! They are perfect for sandwiches to add texture as well as salads and garnishes for color and flavor. Although they take a bit more maintenance than other microgreens, they are well worth the attention for their robust flavor.~25,000 seeds/oz.