edenhana

Bearded Iris

Plant rhizomes shallow, with the top left exposed or barely covered, in a full-sun spot with at least half a day of direct summer sun; buried too deep or mulched too heavily, the rhizome rots instead of flowering. It wants to bake in summer and chill in winter, so gardens in the warmest northern parts of the country, with little real winter cold, may get fewer flowers than further south. Established clumps are genuinely drought-tolerant and often need no summer watering at all. Divide clumps every 2-5 years in summer, after flowering finishes.

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Sun
full sun
Water
low
Spacing
30cm
Difficulty
intermediate
Grows in
Whangārei / Northland, Auckland, Hamilton / Waikato, Tauranga / Bay of Plenty, Gisborne, Napier / Hawke's Bay, New Plymouth / Taranaki, Palmerston North / Manawatū-Whanganui, Wellington, Nelson, Tasman, Blenheim / Marlborough, West Coast, Christchurch / Canterbury, Dunedin / Otago, Invercargill / Southland
Mature height
60cm
Flowering season
Sep, Oct, Nov
Attracts wildlife
Bees
Common diseases
Fungal leaf spot
Common pests
Slugs and snails, Aphids

When to plant by region

In Whangārei / Northland, Auckland, Hamilton / Waikato, Tauranga / Bay of Plenty, Gisborne, Napier / Hawke's Bay, New Plymouth / Taranaki, Palmerston North / Manawatū-Whanganui, Wellington, Nelson and Tasman: January-March and December. In Blenheim / Marlborough, West Coast, Christchurch / Canterbury, Dunedin / Otago and Invercargill / Southland: January-February and December.

Growing stages

  1. PlantingSummer, after the main flowering season

    • Leave the top of the rhizome exposed or barely covered; deep planting or heavy mulch is the most common cause of rot
    • Choose a full-sun position with sharp drainage
    • Space rhizomes around 30cm apart to leave room for the clump to spread

  2. Establishment

    • Water in well at planting, then taper off; established plants are drought-tolerant and rarely need summer watering
    • Check for slugs and snails sheltering around the base, especially in damp conditions

  3. Winter dormancy

    • Foliage dies back over winter; this is normal and not a sign of a failing plant
    • A genuine winter chill, including frost in many cultivars, is what triggers good spring flowering

  4. FloweringSpring

    • Flowering can be noticeably lighter in gardens with very mild, frost-free winters
    • Watch for fungal leaf spot in wet weather, usually small oval spots with a red-brown border

  5. DivisionEvery 2-5 years, in summer after flowering

    • Lift and divide congested clumps once flowering starts to decline, discarding the old woody centre and replanting the younger outer rhizomes

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