Reproduction

As you can see in the taxonomic classification segment of this web page, Wasabia japonica is a member of the phylum Anthophyta, which are also known as angiosperms.  This means that it produces flowers, and its seeds develop inside the flower's ovary.  The ovary then matures into a fruit, which covers the seed, hence the name "angiosperm" ("covered").  Wasabi and other members of this phyla have an array of ways to get pollinated, including abiotic factors such as wind and water, and animals like insects and birds.

Wasabi also has an alternation of generations, which means that it can produce either gametes (which are haploid) or spores (which are diploid).  The gametophytes are unisexual and the sporophytes are heterosporous.