Read more

When Do Irises Bloom – The Right Time

When Do Irises Bloom? – The Right Time

Irises are the easiest perennial flowers to grow and they bloom early but when do irises bloom for real – the exact month or season?  They stem from a rhizome and multiply quickly over the years producing wider and bigger stands that have appealing blooms.  They have over 300 species that are hardy throughout the US with the ability to adapt to various soil and sun conditions.

By growing different types of irises, you can have them bloom from early spring into the summer.  Add a repeat blooming bearded irises, you will get to enjoy blooms in late summer and early fall.  Iris is a great plant for any gardener and they have a place in the hearts of many Americans.

When Do Iris Bloom?

There are hundreds of bearded rebloomers registered with the American Iris Society in the past few years. Many are all-season bloomers while some bloom in different seasons.

Gardeners who are interested in late-blooming irises can plant varieties that bloom from early spring to early summer.

When Do Iris Bloom

Some Japanese Irises and Siberian Irises bloom mid-spring to early summer.  The beardless Southern blue flags bloom into early summer.

Once you have a full garden of bearded irises and bloom, you will experience something magical.

Iris bloom time starts in March in some regions and can go on until almost the end of June. Some other types rebloom late summer and fall.

The hardy perennials of it are plants that thrive in USDA zones 3-9 that offer winter temperatures below freezing thus enabling the plant to enter the dormant stage before the next year’s outburst.

How Many Times Do Irises Bloom Per Year?

There are two or more varieties of iris that bloom a couple of times per year.  If you notice gardens blooming throughout the year, they have several varieties that extend the bloom in different periods of the year.

How Many Times Do Irises Bloom Per Year

The irises will bloom well if you plant them in well-drained moist soils for bearded irises to water-logged where you find Japanese irises. Most irises such as the miniature bulbous irises, Siberian irises need moist soils and good drainage to thrive.  They also need full sun and even light shade.

After the first bloom, feed your irises with an extra feeding of fertilizer and water adequately.  Deadheading your spent flowers can encourage repeat bloom (re-blooming).

Why If My Irises Do Not Bloom?

Sometimes it is true irises may not bloom at all.  Bearded, Asian, classic, or designer, these flowers are a beauty to grow in your garden.  They provide a long-term display of tall, glorious sword-like leaves and boldly featured blooms.

So what happens when they don’t bloom?  When irises don’t bloom, they only produce the beautiful foliage but the long-awaited flowers refuse to appear.  This is frustrating for any farmer because you were all looking forward to beautiful flowers. Frustrating as it is, you ought to get down to business and work towards getting a boom next season.

Reasons For Irises Not Blooming

  • Poor Rhizomes Or Bulbs – They could be rotten, mushy, small, or under-formed.

  • Stunted Plants – these do not produce any blooms or if they do, they produce small blooms.

  • Planting In Shady Areas – Irises need full sun to bloom, if they grow in fully shaded areas, they will not bloom.

  • Dead Plants – This may come from overwatering or poor rhizomes

  • Poor Soil – If your soil is not well-draining and is not fertile it might cause infertility to the plants.  Check your soil to see if the pH and fertility are consistent with the ideal pH of 6.8 with average nitrogen levels and sufficient phosphorous.

  • Overcrowding – If you grow your iris plants too close to each other they will not bloom because they will share the nutrients until there is none to support the bloom.  Dig up the overcrowded clumps and plant each rhizome individually with enough nutrients.  Transplant your rhizomes frequently to avoid overcrowding.

  • Late Freezing – Although irises tolerate very cold temperatures, if they do not sprout at the right time, or if the early leaves and stems succumb to freezing the plant will not bloom.  Freezes experienced by plants 6 to 8 weeks before bloom will abort the buds and stop the blooming.

6-10-10 Controlled Release Iris Food

Insects and diseases are rarely a problem only if you compromise the health of the buds.  But if you take good care of them you will have healthy bloom at the right time.


What month do irises bloom in?

Iris is a spring-flowering plant and the flowers open from early April to mid-May. It's the only species of Iris that can be used as an ornamental flower. In the UK, the most popular variety is the Double Dutch iris (Iris × hollandica 'Double Dutch') which blooms from late April to early May.

The plant is very tolerant of heat and drought and can grow in full sun or part shade.

How do you keep irises blooming?

Caring for your Iris is very important. They need love, water and a little bit of attention. Here are some simple tips to help you get started caring for your irises. Watering the iris is the most important thing to do. Irises like to be kept moist. If you live in a dry area or climate, make sure that the soil is not completely dry.
You should water them every day and that the less you disturb their roots the better. Irises need water but too much water can also cause problems. Water the plant for 10 minutes every two days. This is enough time to keep the soil from drying out.

Make sure that the soil is rich and well drained. If it is too wet, the roots will rot and the plant may die. When it is too dry, the roots can wither and die.
1. Remove any dead leaves. They are not good for the plant and they can cause disease.

2. Place your iris in a warm location. Irises like to be in a place that has bright light. A bright window is fine but you should not place the iris in direct sunlight.

3. Add a small amount of fertilizer to the soil once a month.

How many years will irises bloom?

Iris are perennial flowers. The flower buds on the stems of an Iris grow into flowers that bloom for several weeks in early spring. If you have a flower bed or garden, Iris are easy to grow from seed. They can be planted in a variety of soils and in full sun to partial shade. Some are hardy to Zone 3 and some are hardy to Zone 4.

Iris are native to Eurasia and Africa. They were introduced into North America by Europeans. Today there are more than 350 species of Iris. Plant Iris in early spring when the soil is moist and the temperature is above 50 degrees Fahrenheit. You may transplant them in late summer after they’ve finished flowering and have set seed. Be sure to provide enough light and water to ensure good germination.

Why do irises stop blooming?

Iris is a flower that blooms all year round. I know it's been bloomed in the spring, summer, autumn and winter. But why do some iris flowers stop blooming? A: There are two main reasons that I have seen for this. First, if you plant your iris in the fall and leave it in a cold spot until next spring, they will stop blooming.

They may bloom again after you bring them inside, but not before the cold weather sets in again. Second, some people keep their iris in pots or planters and bring them into the house to protect them from the cold. If they are kept in these containers during the winter, the plants will stop blooming.

Iris Bloom Season Conclusion

Now that we know when do irises bloom and what makes them not bloom you have a better idea of how to grow these beautiful flowers?