Dwerg-iris

Iris reticulata

Engels: Reticulated Iris

bulbIridaceae

Dwerg-iris (Iris reticulata) is a bulb from the Iridaceae family that grows up to 15cm tall. This plant thrives in full sun and requires low maintenance. Blooms in early spring with blue, purple flowers and attracts bees.

Hoogte

10–15 cm

Breedte

5–8 cm

Zonligging

full sun

Waterbehoefte

low water needs

Grondsoort

sandy soil, loam, chalky soil

Onderhoud

low maintenance

Bloeitijd

early spring

Bloemkleuren

blue, purple

Ecologische waarde

Trekt bijen aan

Verzorgingskalender

Taak	Jan	Feb	Mrt	Apr	Mei	Jun	Jul	Aug	Sep	Okt	Nov	Dec
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Care tips

Planting

Plant reticulated iris bulbs between September and November, while the soil is still workable and before the first hard frosts arrive. Choose a spot in full sun with excellent drainage—these small bulbs are prone to rot in wet conditions, so avoid heavy clay or anywhere water sits after rain. Sandy soil, loam, or chalky soil all suit them well. Before planting, work the soil to a depth of about 15 cm and incorporate some grit or sharp sand if drainage is less than perfect. On heavy ground, consider planting in raised beds or mixing in plenty of coarse sand to improve structure. The bulbs are small, typically 2–3 cm across, and should be planted about 8–10 cm deep (roughly three times their own height). Space them around 15 cm apart, though you can cluster them more tightly in groups of five or seven for a better display—they look rather lost when dotted singly. Plant each bulb with the pointed end facing upwards. If you're unsure, look for the dried remnants of last year's roots at the base. Firm the soil gently over the bulbs but avoid compacting it heavily. Water lightly after planting to settle them in, but don't saturate the ground. Reticulated irises need a dry summer dormancy after flowering, so avoid planting them where they'll receive regular irrigation later in the year. A sunny rock garden, gravel garden, or the front of a well-drained border suits them perfectly. No staking is needed given their short stature, and mulch isn't necessary—in fact, a gravel mulch can help with drainage and keep the necks of the bulbs dry.

Pruning

Reticulated iris doesn't require pruning in the conventional sense, and there are no specific pruning months for this bulb. However, there is some light tidying to do after flowering to keep the plants healthy and allow them to build up reserves for next year's display. Once the flowers fade in early spring—usually by late March or early April—resist the temptation to cut back the foliage immediately. The narrow, grass-like leaves continue to photosynthesise and feed the bulb below ground for several weeks after flowering finishes. Leave the foliage intact until it turns yellow and withers naturally, typically by late May or June. Only then should you remove it, either by gently pulling away the dead leaves or snipping them off at ground level with scissors or secateurs. If you cut the leaves back while still green, the bulbs will weaken and may not flower well the following year. Deadheading the spent flowers is optional but tidy. Snip off the faded blooms just below the flower head to prevent seed formation, which diverts energy away from bulb development. Use clean, sharp scissors or small secateurs for this job. If clumps become congested after several years and flowering diminishes, you can lift and divide the bulbs in late summer when they're fully dormant—typically July or August. Gently separate the small offsets from the parent bulbs and replant immediately at the correct depth and spacing. This isn't annual maintenance, but it refreshes tired clumps and gives you more bulbs to spread around the garden.

Maintenance

Reticulated iris is a low-maintenance bulb once established, but getting the watering regime right is essential. These bulbs need moisture in autumn and winter as they develop roots, and again in early spring as they flower. However, they must have a dry dormancy period from late spring through summer. Water sparingly after planting in autumn if conditions are dry, but natural rainfall is usually sufficient through winter. Avoid watering from late May onwards—wet summer conditions encourage bulb rot. If you grow them in pots, move containers under cover or tip them on their side after the foliage dies back to keep them dry. Feed once in early spring, ideally in March, just as the shoots emerge. Use a low-nitrogen, high-potash fertiliser such as a tomato feed diluted to half strength, or scatter a light dressing of bone meal around the clumps. Avoid high-nitrogen feeds, which promote soft leaf growth at the expense of flowers. Don't feed after flowering; the bulbs need to harden off for dormancy. Reticulated iris is hardy to zone 5a, so winter protection isn't needed in temperate Europe. The main pest problem is iris ink disease, a fungal condition causing black blotches on the bulbs and stunted growth. Lift and destroy affected bulbs immediately and avoid replanting irises in the same spot. Narcissus bulb fly larvae occasionally tunnel into the bulbs; if you notice soft, damaged bulbs at planting time, discard them. Slugs may nibble emerging shoots in early spring—scatter slug pellets or use barriers if damage is severe. Mulching isn't recommended, as it can trap moisture around the bulbs and increase the risk of rot.