Fish Grass Seeds - Houttuynia cordata Houttuynia cordata is a species of low-growing perennial plant to which certain digestive properties are attributed. Its leaves are widely used to consume as vegetables, which have the curiosity of having a strange taste that is usually described as a flavor similar to fish. . Sow in a warm-sheltered-luminous place, without covering the seeds in a substrate that drains well and transplant the plants when they already have several pairs of leaves.