Irises

Iris bulbs are a diverse and captivating group of flowering bulbs, popular for their stunning blooms and unique flower structure. Originating from Europe, Asia, and North America, these perennial plants thrive in well-drained soil and sunny locations, though some tolerate partial shade. We supply both Species Iris, the small and early bulbs, and Dutch Iris, a taller flower appearing in late spring. Both grow from bulbs, whereas Bearded Iris and Siberian Iris grow from roots. 

Stephen’s Iris bulb top picks

Stephen is the 3rd generation of his family to work in the flower bulb industry; he grows hundreds of varieties of new bulbs each year. His family was involved in growing Iris in Lincolnshire until the 1980s

• J.S. Dijt: A rich purple flower so intense in colour, they are hard to photograph. It’s best to enjoy them in the flesh.
• Carmen: A Dutch Iris of gentle faded blue or purple. A little short for a Dutch Iris but the flowers are large and magnificent.
• Red Ember: A deep mahogany colour that changes with the light. It seems the brighter the sun the darker the petals go. 

Planting Iris Bulbs

• Timing is crucial when planting Iris bulbs; late summer or early autumn is ideal. 
• Plant bulbs to a depth about twice their height, allowing space for air circulation. 
• Soaking bulbs in cold water for 24 hours before planting can help, but it’s optional. 
• Plant in a sunny location

Caring for Iris Bulbs

Regular watering during dry periods and balanced fertiliser in spring support vibrant blooms. Mulching helps retain moisture and regulate soil temperature. While Species Iris reliably flower each year, Dutch Iris may need adequate light to avoid coming up blind the following year. They are hardy and tolerate cold temperatures well.

Why choose Peter Nyssen bulbs?

• We are a friendly, family-run business with more than 60 years of experience
• We offer bulk prices and free delivery for orders over £50
• We supply flower bulbs in quantities large and small, for all types of gardeners from the cottage potterer to the professional landscaper 
• With a range of colours and varieties available, you'll be spoilt for choice.

FAQs About Iris Bulbs

How do I store Iris bulbs before planting them?

Store Iris bulbs in a cool, dry place with good air circulation. Avoid exposing them to direct sunlight or extreme temperatures. Keeping them in a breathable bag or container helps prevent mold and rot. Plant them as soon as possible for best results.

Can Iris bulbs be planted in containers?

Yes, Iris bulbs can be planted in containers. Ensure the container has good drainage and use a high-quality potting mix. Place the container in a sunny spot and follow standard planting depth and spacing guidelines. Regular watering is crucial, as containers dry out faster than garden soil.

How do I divide and transplant Iris bulbs?

Divide Iris bulbs every 3-5 years to maintain plant health and bloom quality. Dig up the bulbs after flowering and carefully separate them, ensuring each division has healthy roots. Replant them immediately in a prepared bed or container.

Can Iris bulbs grow in partial shade? 

Yes, some Iris species tolerate partial shade, but they generally prefer well-drained, sunny locations.

How do you ensure Iris bulbs flower each year? 

Species Iris are more reliable bloomers annually, while Dutch Iris need sufficient light. Make sure you remove the seed heads after flowering.

For more information and to purchase Iris bulbs, visit our planting guide

Need more help?

With the right planting time and location, these stunning flowers will thrive and add colour and interest to your outdoor space. So why not give them a try in your own garden? 

Browse our collection of iris bulbs now or for help and advice, call our team on 0161 747 4000. 

If you have any questions get in touch – we can advise on great colour combinations, how many bulbs you need and even landscape or trade enquiries. 

The Iris family is a diverse group of flowering bulbs. Within this group we have a range of species iris bulbs and taller ‘Dutch Iris’. Originating from various regions, including Europe, Asia, and North America, these perennial plants have captivated gardeners for centuries with their stunning blooms and unique structures.

Iris bulbs typically prefer well-drained soil and a sunny location, although some species tolerate partial shade. They're not overly finicky, but they do appreciate slightly acidic soil that isn't waterlogged to prevent bulb rot. These bulbs are resilient and can adapt to different climates, making them a versatile choice for various garden settings.

Planting Iris bulbs

When it comes to planting Iris bulbs, timing is key. The best time to plant them is usually in late summer or early fall, allowing the bulbs to establish roots before the winter chill sets in. The planting depth varies depending on the species, but a general rule of thumb is to plant them about twice as deep as the bulb's height. Be sure to space the bulbs adequately to allow for proper air circulation. 

Some growers soak the bulbs in cold water for 24 hours before planting but its not essential.

Iris bulbs are also known for their rhizomatous or bulbous structures, each contributing to the growth and development of the plant. The rhizomatous varieties, such as Bearded Irises, should be planted with the rhizome near the soil surface, while bulbous Irises are typically buried at a greater depth.

Caring for Iris bulbs involves regular watering, especially during dry periods, and a balanced fertilizer application in the spring to support healthy growth and vibrant blooms. Mulching around the plants can help retain moisture and regulate soil temperature.

Will Iris flower year after year?

Species Iris are more reliable at flowering. Dutch Iris can often come up blind the following year if they are not getting enough light. 

They are hardy bulbs and can tolerate cold temperatures. 

• Species Iris are small and early flowering
• Dutch Iris are tall (50 cm) and flower in late spring early summer.