Dutch iris bulbs

Dutch iris bulbs are best planted in autumn, usually during September and November. Planting at this time allows them to establish before winter and prepare for flowering the following late spring or early summer. Plant the bulbs reasonably soon after receiving them rather than keeping them in storage for long periods.

Plant Dutch iris bulbs in well-drained soil with the pointed end facing upwards. They work particularly well planted in groups through borders, where their narrow foliage takes up little space between neighbouring plants. Dutch iris dislike persistently wet ground, so free drainage is especially important during winter.

Dutch iris bulbs can be planted up to around 15cm deep, with approximately 5–7.5cm between bulbs. Deeper planting can help encourage bulb irises to flower more reliably in following years. Grouping several bulbs together usually creates a stronger display than planting them individually.

Dutch iris generally flower from late spring into early summer, typically around May and June. Their timing makes them especially useful for bridging the period between the main spring-bulb season and summer-flowering perennials. Mature plants usually reach around 60cm tall when in flower.

Dutch iris are true bulbous irises. This distinguishes them from familiar bearded irises, which grow from rhizomes rather than bulbs. Dutch iris bulbs are rounded underground storage organs and are planted in autumn, while rhizomatous irises require quite different planting treatment.

Dutch iris, Iris × hollandica, grow from bulbs and produce slim, upright stems with relatively delicate flowers and narrow foliage. Bearded irises grow from rhizomes and tend to have broader, fan-like foliage and larger, often highly ruffled flowers. Their planting methods are also different: Dutch iris bulbs are buried, whereas bearded iris rhizomes are planted with their upper surface partly exposed.

Yes. Dutch irises are excellent cut flowers, with long stems and elegant blooms that work particularly well in spring and early-summer arrangements. Dutch iris are ideal for cutting and their flowers are long-lasting. Planting a generous group allows you to pick stems for the vase while still leaving plenty of colour in the garden.

Yes. Dutch iris are hardy bulbous perennials and can flower for several years, particularly when grown in freely draining soil. Dutch iris are among the more reliable bulb irises for repeat flowering. Allow the foliage to die back naturally after flowering so the bulbs can replenish their reserves.

Yes. Dutch iris grow well in pots and containers, provided drainage is good. Use a free-draining peat-free compost and a container with drainage holes, planting several bulbs together for a fuller display. Bulb irises can also be grown in containers outdoors and temporarily brought indoors as the flower buds begin to open.