Iris hollandica blue is a graceful summer bloomer that has showy dark purple flowers with bright yellow markings on its falls. Iris hollandica flowers in June-July and grows to about 50-60 cm. The brilliance of this flower provides a lot of pleasure when planted in gardens, along walls, or in a vase. Plant irises in the autumn in full to partial sun. Place the bulbs in the planting hole and cover with 5 cm. soil with a distance between bulbs is 10-15 cm.