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Water pepper is a sharp, peppery annual herb that brings bold culinary punch to salads, soups, and sushi in just 60 days. This open-pollinated heirloom thrives in moist soil and reaches 12 to 30 inches tall, making it equally at home in garden beds, raised boxes, or containers. Hardy from zones 5 to 10 and beloved in Japanese cooking, water pepper combines serious flavor with ornamental appeal, rewarding gardeners who give it the damp conditions it craves.
Full Sun
High
5-10
30in H x ?in W
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Moderate
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Water pepper delivers an intense, peppery bite that transforms ordinary dishes with a bold culinary kick. Popular in Japanese cuisine for centuries, this heirloom annual actually prefers wet feet, thriving along moist field edges or in containers where other herbs would struggle. The upright growth habit reaches a modest 12 to 30 inches, making it compact enough for container gardening while offering both edible leaves and ornamental interest.
Water pepper's peppery leaves deliver a bold punch to salads, where they add heat and spice without overpowering other ingredients. It shines in Asian soups and broths, adding a characteristic bite that lingers on the palate. The fresh leaves also garnish sushi and other Japanese dishes, where its sharp flavor complements delicate fish and rice. Some gardeners harvest it for medicinal teas, though its culinary applications remain primary.
No timeline data available yet for this variety.
Transplant after the last frost when soil has warmed. Space 12 inches apart with 18 inches between rows.
Direct sow seeds in spring after the last frost in areas with a long growing season.
Begin harvesting leaves 60 days after planting when the plant reaches a usable size. Pinch off individual leaves or small sprigs as needed, harvesting from the top to encourage continued branching. The leaves can be harvested continuously throughout the growing season until frost arrives in fall.
Pinch back the growing tips early in the season to encourage bushier, more compact growth. As an upright annual, water pepper benefits from light pinching to prevent it from becoming too tall and leggy, particularly if grown in containers where space is limited.
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“Water pepper is an heirloom variety steeped in Japanese culinary tradition, where it has been valued for generations as a peppery accent to traditional dishes. Passed down through seed-saving communities, this open-pollinated annual represents the kind of kitchen herb that gardeners have preserved and shared across regions precisely because of its distinctive flavor and the cultural dishes it defines. Its journey from Eastern food traditions to Western seed catalogs reflects the growing appreciation for heritage herbs that modern gardeners are rediscovering.”