Yellow Flag Iris is a hardy perennial known for its sculptural flowers above crisp, sword-like foliage. Yellow Flag Iris flowers in late spring to early summer in shades of yellow, and performs best in full sun with moderate watering once established. This perennial matures to roughly 1.5-3 feet tall and 1-2 feet wide. It is ideal for perennial borders, cottage gardens, and pollinator plantings, offering dependable colour that returns every year. Easy to establish and simple to maintain, Yellow Flag Iris rewards basic care with a reliable display season after season. A layer of mulch helps hold moisture and keeps roots cool in summer.
Mature height: 1.5-3 feet
Mature width: 1-2 feet
Bloom: Yellow, late spring to early summer
Light: Full Sun
Water: Moderate — about 2.5 cm of water per week in the growing season
Hardiness: Zone 3-9
Maintenance: Low maintenance
Pruning: Cut back to the ground in late fall or early spring; deadhead spent blooms through the season to encourage rebloom.
🪴 Planting Instructions: Dig a hole slightly wider than the pot, keeping the top of the root ball level with the surrounding soil. Loosen circling roots before planting, backfill with native soil amended with compost, then water thoroughly to settle. Space plants about 1-2 feet apart and keep well watered through the first full season while roots establish. Plant in full sun.
💧 Care & Watering: Water moderate: about 2.5 cm of water per week in the growing season. Mulch to conserve moisture and moderate soil temperature, and feed with a balanced slow-release fertilizer in early spring. Cut back to the ground in late fall or early spring; deadhead spent blooms through the season to encourage rebloom.
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