Iris pseudacorus bastardii is a variety of Iris pseudacorus, commonly known as Yellow Flag Iris. It is a robust, clump-forming perennial plant with striking yellow flowers and tall, sword-shaped leaves. Here's a detailed description and care guide for Iris pseudacorus bastardii:

Description:
Iris pseudacorus bastardii is very similar to the species Iris pseudacorus, with a few minor differences. It features upright, sword-shaped leaves that grow in a fan-like arrangement. The leaves are typically bright green and can add a vertical element to garden borders or wetland areas. From late spring to early summer, Iris pseudacorus bastardii produces large, showy, yellow flowers with three upright petals (standards) and three drooping petals (falls). The falls have distinctive brown or purple markings near the throat. The flowers are often fragrant and attract pollinators, such as bees and butterflies. After flowering, seed capsules develop and contain numerous brown seeds. Iris pseudacorus bastardii adds vibrancy and color to garden ponds, water gardens, or wetland areas.

Care Guide:

Lighting: Iris pseudacorus bastardii thrives in full sun to partial shade. It prefers a location with at least 6 hours of direct sunlight per day. However, it can tolerate some shade, especially during the hottest parts of the day. Insufficient light may result in weaker growth and fewer flowers.

Water: Iris pseudacorus bastardii prefers consistently moist to wet soil conditions. It is naturally found in wetland habitats, such as marshes or along pond edges. Ensure the soil remains evenly moist throughout the growing season. Water deeply when the top inch of soil feels dry to the touch. In drier regions or during hot weather, providing supplemental irrigation can help maintain adequate moisture levels.

Soil: Iris pseudacorus bastardii prefers fertile, slightly acidic to neutral soil. It grows best in moist, well-draining soil that is rich in organic matter. If your soil is heavy or clay-based, you can improve drainage and fertility by adding compost or well-rotted manure. Avoid excessively sandy soil, as it may dry out too quickly.

Temperature: Iris pseudacorus bastardii is hardy in USDA hardiness zones 4-9. It can tolerate a range of temperatures but generally prefers moderate conditions. Protect the plant from extreme heat or prolonged periods of frost. In regions with hot summers, some afternoon shade can help prevent stress on the plant.

Fertilizer: Iris pseudacorus bastardii is generally tolerant of a variety of soil conditions and does not require heavy fertilization. However, incorporating a balanced, slow-release fertilizer into the soil in early spring can provide additional nutrients. Follow the manufacturer's instructions for dosage and application methods.

Maintenance: Iris pseudacorus bastardii is a low-maintenance plant. Regular maintenance involves removing any dead or yellowed leaves or spent flowers to maintain a tidy appearance. After blooming, you can remove the flower stalks near the base. Dividing the clumps every few years can help rejuvenate the plant and prevent overcrowding.

Propagation: Iris pseudacorus bastardii can be propagated through division. The best time to divide the clumps is in late summer or early autumn, after the plant has finished blooming. Carefully lift the clumps, separate them into smaller sections, ensuring each division has healthy roots and fan-like foliage, and replant them in suitable soil. Divisions should be planted at the same depth as they were previously growing.

Pests and Diseases: Iris pseudacorus bastardii is generally resistant to pests and diseases. However, it may occasionally attract iris borers or be susceptible to leaf spot diseases if growing conditions are unfavorable. Monitor the plant for any signs of pests or diseases and take appropriate measures if necessary.

By following these care guidelines, you can enjoy the vibrant and elegant flowers of Iris pseudacorus bastardii in your garden borders, water gardens, or wetland areas. Adjust the care routine based on your specific growing conditions and monitor the plant for any signs of stress, pests, or diseases. With proper care, Iris pseudacorus bastardii can provide a splash of color and bring a touch of natural beauty to your outdoor spaces.