Water arum is a compact native perennial that brings the charm of northern wetlands right into your garden. This small but mighty plant, native to bogs and marshes across Alaska, Canada, and the northern United States, grows just 6 to 12 inches tall and thrives in the moist, acidic soils where many other ornamentals struggle. Hardy from zones 2 through 6, it produces showy flowers and fruit from June through July, making it a standout choice for rain gardens and water features where you want something genuinely adapted to wet conditions rather than merely tolerant of them.
Partial Shade
Moderate
2-6
12in H x 12in W
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Moderate
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Water arum's smooth, waxy, broad-oval leaves catch the light beautifully, emerging from rhizomes that anchor it firmly in boggy ground. The showy flowers and ornamental fruit appear in early summer, drawing attention in a low-growing plant that otherwise asks very little of you. Its complete indifference to the wet soil that drowns most perennials, combined with its ability to grow in standing water up to 2 inches over the crown, makes it essential for anyone designing a true wetland garden rather than just a moisture-tolerant border.
Water arum shines in rain gardens and water features where its tolerance for sustained moisture becomes an asset rather than a limitation. Plant it at the shallow margins of ponds, in bog gardens, and in rain garden designs where seasonal standing water accumulates. Its compact size and low growth habit make it useful for edging water features without overtaking the space, and its showy summer flowers and fruit add ornamental interest to wet areas that often lack good planting options.
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Establish water arum rhizomes in spring in their permanent planting site, positioning them in acidic, moist to wet soil in part shade. Space plants 6 to 12 inches apart based on your desired mature width.
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“Water arum's story is one of northern adaptation. Native across a vast range from coastal Alaska through Canadian bogs to the marshes of New England and west to northern Illinois and North Dakota, this species has quietly thrived in cold wetlands for millennia. It belongs to the arum family, placing it in kinship with the showy jack-in-the-pulpit of eastern woodlands, but water arum specialized for life at the margins of ponds, slow-moving streams, and permanent seepages where standing water is the rule, not the exception. This deep ecological history means the plant carries in its genetics exactly what it needs to succeed in genuinely wet conditions.”