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Wasabi seeds are difficult to source at local nurseries, so most people order them online. Late fall is the best time to order seeds; wasabi needs the winter to establish good roots. When the seeds arrive, keep them moist and plan to plant within 48 hours of receipt. The night before you plant them, place the seeds in a small bowl and cover them with distilled water. Soak the seeds overnight prior to planting. Soaking will help to soften the seed shells and make it easier for the wasabi to germinate. Sow the seeds one to two inches apart and press them lightly into the soil. Wasabi is a semi-aquatic plant that must be kept wet to flourish. Every day, mist the soil and the sprouting seedlings with fresh, cool water to emulate splashes from natural water sources, like a stream or waterfall. If the wasabi is allowed to dry out, it will begin to wilt.  A micro-irrigation system is a good alternative to misting. Watch your plants for wilting (not enough water) and root rot (too much water), and adjust your irrigation accordingly. Because wasabi must be kept wet, it is susceptible to mold and disease. If you see a plant become diseased (wilted and discolored), pull it out right away to prevent it from spreading to other plants. Do not soak the soil or plants with a hose or watering can, as this increases the chance of rot and disease. . Weed out competing plants so the wasabi roots have plenty of room to grow. Since the soil is kept moist on a daily basis, weeds tend to sprout quickly. Weeding every day or every other day will keep the problem under control.

Summary:
Order seeds in late fall. Plant the seeds. Keep the soil and seedlings moist. Weed the planting beds