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Iris reticulata, the cute early blue spring bulb, grow a carpet of blue!

Beautiful cluster of iris reticulata flowers, the dwarf iris

Iris reticulata is one of the first (blueish) flowers of spring, appearing in sync with snowdrop and early crocus.

Technical Iris reticulata facts:

Name – Iris reticulata
Family – Iridaceae
Type – perennial bulb plant

Height – 1 ½ feet (15 cm)
Exposure – well-lit
Soil – cool, draining well

Foliage: deciduous
Flowering: winter’s end, beginning of spring

Commonly called reticulated iris, this dwarf plant has small blooms that are 1 to 2 inches tall (3-5 cm), and foliage that is similar to that of daffodil. The blue color of its flowers is impossible to miss at the end of winter or around the beginning of spring, depending on your geographical area.

Iris reticulata grows in the wild in the cold, dry mountains of Turkey, Irak, Iran and Russia. Saying it’s not afraid of the cold is not an understatement! Extremely hardy, this iris can grow nearly everywhere.

Planting iris reticulata

Bulbs need a constant renewal of moisture in spring, but must stay rather dry during summer and fall. They’ll simply start rotting in heavy, wet soil.

Rock gardens and landscaping with gravel are ideal locations for these bulbs. Also consider planting a few in the water drainage hole near decks or downspouts. Another option is to grow these bulbs in a pot.

Whether in the ground or in a pot:

  • Planting iris reticulata sometimes happens on cold days. That's okPlant the bulbs in soil that drains well.
  • Plant in normal potting soil mix, with amendments that guarantee great drainage.
  • The depth at which to plant them should be 3 to 4 inches (8-10 cm), with about 3 inches between bulbs (6-8 cm). The pointy tip must be facing upwards.
  • Dwarf iris bloom best in full sun, but they’ll still grow well in part shade.
  • Garden stores sell the bulbs either bare (with no leaves yet) at the beginning of fall; or with leaves, sometime in the middle of winter. Plant them right after purchasing.

Landscaping tip: plant daffodils at the beginning of spring to play around with the stark contrast between the intense blue of dwarf iris and the bright yellow daffodils display. Grape hyacinths, which also bloom in the same week, are great companion plants.

In pots, iris reticulata does particularly well. It need nearly only gravel

Growing and care

Once the flower has finished blooming, its leaves will quickly wilt away and the bulbs drop into dormancy until the middle of the following winter. Nothing to do at this stage.

Care to give your iris reticulata, here a blooming bunchWhen the bulbs of your Iris reticulata are happily settled in, they propagate and, in time, you might find that there are too many of them (no more space between each iris). If this happens, flower quality may start to drop.

Info: the planting period for bare bulbs may range from beginning of October in the north, to mid-November in the south.

A good rule is to plant them about 6 weeks before the ground freezes up.


Even though Iris reticulata propagate on their own as years come and go, it still takes a few years for new bulbs to mature and start blooming. The best way to guarantee an abundance of flowers every spring is to plant fresh new bulbs every year. Nonetheless, dwarf iris that are happy where they were sown will bloom repeatedly year after year.

To “reduce” the number of bulbs if they’re overcrowded, dig them out at the end of summer and segregate them. Plant about half of them in the same area, and find new places to plant the ones left over.

Diseases and pests:

As a family, iris tends to not suffer much from disease. Most problems are due to excess moisture, especially during the summer.

Good to know about reticulated iris

Flowers from a specific cultivar, Iris reticulata ‘Harmony’ are quite remarkable: their bright cobalt blue color and bright yellow dashes of color decorate the drooping petals. The yellow spot is a botanical curiosity, called “reticulation”: this is where the species’ name comes from. (reticulata).

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Image credits (edits Gaspard Lorthiois):
Pixabay: Christian Oehlenberg
CC BY 2.0: Mark Wordy, Alex Lomas
own work: Rosalyn & Gaspard Lorthiois
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