With its elegant, slender foliage and refined spring flowers, Iris sibirica 'Cape Cod Boys' (Siberian Iris 'Cape Cod Boys') brings a clean, architectural look to beds, borders, and waterside plantings. You will get the best bloom when the plant is grown in full sun, though it also performs well in part shade, especially where summers are hot. At maturity it typically stands about 27-32 inches tall, forming a tidy, upright clump that looks attractive even after flowering.

Plant it in soil that stays evenly moist, particularly in spring and early summer. While it can handle average garden conditions once established, it appreciates consistent moisture for strong growth and reliable flowering. Use it along pond edges, in a rain garden, or in a border where you can water during dry spells. A light mulch can help hold moisture, but keep mulch from piling directly over the crown so new growth can emerge cleanly.

Routine care is simple: remove spent flower stalks after bloom, and trim back tired foliage later in the season if you want a neater look. Divide crowded clumps every few years to refresh vigor and keep the planting from becoming too dense. When dividing, replant pieces promptly and water well until they reestablish.

Siberian iris flowers are visited by pollinators, so it can be a welcome addition to a pollinator-friendly garden. Pair it with other moisture-loving perennials or with plants that echo its grassy texture for a cohesive planting that looks good from spring through fall.

Specifications

• Cold hardiness zone: 3-8 (-40 degrees F) - Contact your local extension to confirm hardiness if you are in a fringe zone (we cannot guarantee hardiness in fringe zones)
• Light: Full sun   Part sun
• Growth rate: Moderate
• Mature height: 27-32"
• Spread: 18-24"
• Attracts: Butterflies

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