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How to grow iris

How to grow iris


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How to grow iris: tips for growing iris in pots or in the ground. Flowering period and tips for plant multiplication. What to do if the iris does not bloom.

L'irisit's aflowering plantwhich is rarely missing in a flower garden. The bearded iris, with its resistance, is the one that best adapts to difficult conditions: it is very rustic and does not require much care. The bearded iris is not the only variety that can be grown in pots or in the garden. Here is valuable advice oncultivation of iris.

Iris: flowering period and variety

Theflowering periodit can vary according to the different species and varieties chosen. L'iris barbata, for example, has aflowering periodwhich goes from spring to early summer.

There are, however,summer flowering irisorremontant iris, that is, after giving a first flowering in spring, they give a secondsummer floweringwhich they keep until autumn arrives.

Thesummer flowering iris, that is theremontant iristhey are not an absolute guarantee: the secondsummer floweringit is repeated only if the plant is well kept. In some cases, if theirisfinds his ideal conditions, he might even have onefloweringautumnal! In this case we are talking about remontant irises such as:

  • Siberian irises
    to be grown in a sunny or partial shade.
  • Iris Spuria
    they are almost as resistant as bearded irises, even here the recommended position is very bright, a place in partial shade (but bright) or only slightly shaded
  • Iris Spuria
    to be grown in a sunny or light shade.
  • Iris Pseudacorus
    it needs very humid soil, excellent for growing on the edges of an artificial lake.
  • Iris Versicolor
    to be grown in light shade or in a sunny position, it requires abundant irrigation.

Among the other varieties that we often find in gardens are theiris germanica heiris reticulata.

If you are looking foriris bulbs(better defined rhizomes) you can see the different varieties available that you find on "this Amazon page", in this way you get an idea of ​​the many varieties of iris that you find on the market because the list I have just proposed is only partial.

When to plant iris

In principle, all the varieties mentioned (iris germanica, iris reticulata, iris barbata, and remontant varieties) can beplantin late summer or early autumn. It's possibleplant the iriseven in early spring.

How to grow potted irises

The rules to follow are the same as we will see below. You will just need to make sure you have a large and deep enough pot. Calculate that the planting of the bulbs (rhizomes) must be done at a depth of 8 cm, so the pot must have a minimum depth of 10 cm.

Beyond the depth, care about the diameter. The minimum diameter of the pot must be 30 cm.

Iris rhizomatosis: multiplication

L'irisit's aperennial flowering plantwith a fleshy root system called rhizome, so we speak ofiris rhizomatosis. The rhizome widens considerably and so, in case ofcultivation of iris in pots, every 2 years, when the plant dries up in winter, it is necessary to check the size of the rhizome and, if necessary, to multiply the plant.

In the open ground, the multiplication of the rhizome occurs spontaneously: the root expands and theiris plantsthey cover an increasingly large area of ​​the garden.

If you want to multiply the plants to move theirisin other flower beds or grow iris in pots (to give as gifts or to keep on the balcony) then you can do thedivision of rhizomeswhen the vegetative part dries up.

In winter, the plant enters vegetative rest (occurs after theflowering). Theredivision of rhizomesof the rhizomes, when the plant is cultivated in the open ground, it must be performed every 3 - 4 years, so as to allow the rhizome to grow.

How to multiply the iris?

At the end of flowering, before the vegetation has dried up, extract irhizomes. This operation is not as simple as you imagine, you will have to dig carefully and extract the rhizome without damaging it. To help you, if the ground is too hard, use a small fork.

Once you have identified the rhizomes, clear them of the ground. The rhizomes can be divided with your hands or with the help of a sharp and clean knife. Each fragment must have at least a tuft of leaves or a bud. Leaves that are too long, if still vigorous, will need to be shortened (use scissors, no leaves should be higher than 10 cm).

Each portion of rhizome can be planted in a pot or in a different place in the garden.

How to grow iris

As stated, the planting period falls in early spring or between late summer and early autumn. In southern Italy, where the climate is particularly mild, the ideal is to continue in October.

The plants must have space to grow, at the time of planting, calculate a distance between one plant and another of 30 cm.

Forcultivate irischoose a soft, well-draining soil. Only for Iris Versicolor and Iris Pseudacorus, you can choose a moist soil. In no other case the soil must be moist, otherwise you risk rotting the rhizomes.

L'irisloves to see the sun, any species, you can plant any iris in full sun even if the blooms are likely to last less but will certainly be more abundant.

Iris does not bloom

If the iris does not bloom, perhaps the scrub created is too thick: if the rhizomes grow excessively, the plant on the surface ends up weakening and will tend tobloom littleor not bloom at all.

To stimulate flowering, you can add slow-release granular fertilizer to the soil in early spring. In the case of remontant iris you can also administer it in summer, but it is better never to go beyond the month of August.

Fertilize the iris with an iron-enriched fertilizer. On "this Amazon page" a good fertilizer useful for garden plants (both evergreen and flowering plants, as long as they are not acidophilic) can be bought at a price of € 7.85 with free shipping. If you have an ox blood type fertilizer in the house, you can use that. You can use a universal fertilizer for flowering plants but the classic universal fertilizer for green plants is not suitable (it would end up stimulating green vegetation at the expense of flowering).


Video: New Iris Bed - Wisconsin Garden Video Blog 706 (June 2022).


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