Vigorous, Iris pseudacorus, commonly known as Yellow Iris, is a herbaceous perennial with eye-catching bright yellow flowers, 4 in. wide (10 cm), adorned with a brown or violet veining on each fall. Sitting atop sturdy, upright, branched stalks, the flowers create a very striking display. Each flower stalk bears up to 4-12 flowers. The foliage of erect, sword-shaped, gray-green leaves is equally attractive and remains good-looking through the entire growing season. Blooming in great…