There’s a moment in every iris lover’s year that is tinged with a little sadness. It’s that point in early summer when the last spectacular spring bloom has faded. For weeks, your irises were the undisputed stars of the show, and now their elegant, sword-like leaves are all that remain. But what if the show didn’t have to end?
What if you could have that same breathtaking color and elegant form in the heat of July, the golden light of August, and even into the autumn? You can. The secret is expanding your garden to include a curated collection of summer iris varieties.
This isn’t just a list of plants. This is a visual gallery of our absolute favorite late-blooming and reblooming irises—the tried-and-true performers that will transform your garden into a season-long spectacle. We’ll show you how to choose the right summer iris to create a garden that never stops blooming.
Understanding the Secret: Late-Blooming vs. Reblooming Irises
Before we get to the gallery, it’s important to understand the two main types of summer iris. Knowing the difference is what separates the novice from the expert and is key to planning your garden for continuous color.
- A Late-Blooming Iris is a variety that, by its nature, simply flowers later than the main crop of bearded irises. While most irises bloom in May and June, these varieties are genetically programmed to put on their main show in late June or July. They are a fantastic way to bridge the gap between spring and summer.
- A Reblooming Iris (also called a “remontant” iris) is the true magic-maker. These incredible varieties produce their first flush of flowers in the spring along with everyone else. Then, after a short rest, they produce a second, and sometimes even a third, set of blooms in late summer and autumn. These are the ultimate summer iris performers.
A personal favorite strategy in our garden is to plant a mix of both. The late-bloomers carry the color into mid-summer, and just as they are fading, the rebloomers kick in. For a complete overview of the iris lifecycle, you can always refer to our foundational guide on how to plant, grow, and care for irises.
Our 10 Favorite Summer Iris Varieties
Here is a curated collection of some of the most beautiful and reliable reblooming iris varieties and late-bloomers available. We’ve chosen them for their stunning colors, vigorous growth, and proven performance as a summer iris.
1. ‘Immortality’
If there is one reblooming iris that every single garden should have, it’s ‘Immortality’. It produces elegant, pure white flowers with ruffled falls and a gentle, sweet fragrance. Its spring bloom is magnificent, but its real value comes in late summer when it reliably sends up a second set of pristine white stalks. A personal favorite in our garden for a late-summer surprise, it looks absolutely stunning against a backdrop of autumn foliage.
2. ‘Clarence’
‘Clarence’ is beloved for its gentle, two-toned beauty. It features soft, sky-blue standards that float above pristine white falls edged in a delicate blue picotee. It’s not only a reliable rebloomer but also an incredibly vigorous grower. If you’re looking for a plant that will multiply quickly and give you a dependable late-season show, ‘Clarence’ is a fantastic choice.
How to Guarantee a Second Bloom from Your Summer Iris
It’s important to be honest: while these reblooming iris varieties are genetically programmed to flower again, a second bloom is not always guaranteed. It depends heavily on your climate and providing the right care. This is where your trustworthiness as a gardener comes in.
To give your rebloomers the best possible chance, you need to give your summer iris a little extra attention:
- Provide Enough Water: Unlike their once-blooming cousins who like a dry summer dormancy, rebloomers need consistent moisture throughout the summer to fuel their second round of growth.
- Deadhead Promptly: As soon as the spring flowers fade, cut the entire flower stalk down to the base. This prevents the plant from wasting energy on making seeds.
- Fertilize Lightly: A light feeding with a low-nitrogen fertilizer right after the first bloom season can provide the energy boost needed for a second show.
- Ensure Full Sun: Just like with the first bloom, a second bloom requires a huge amount of energy. At least 6-8 hours of direct sun is essential for any summer iris.
For more detailed information on specific varieties, a fantastic and authoritative resource is the American Iris Society’s Iris Encyclopedia.
❓ Frequently Asked Questions (FAQ)
- Do all irises bloom in the summer?
- No, most common bearded irises (Iris germanica) have their main bloom season in the spring. To get flowers later in the year, you need to specifically choose a summer iris variety that is labeled as “late-blooming” or “reblooming.”
- Do summer irises need full sun?
- Yes, absolutely. Just like their spring-blooming relatives, all late-blooming and reblooming irises require at least six to eight hours of direct, unfiltered sunlight per day. This is the most critical factor for getting a strong bloom, both in spring and again in summer or fall.
- How do I care for summer irises differently than spring irises?
- The main difference in care is summer moisture. While traditional irises prefer a dry period in the summer, reblooming varieties need consistent watering after their first bloom to gather the energy for a second round of flowers. They are also heavier feeders and appreciate a light dose of low-nitrogen fertilizer after the first bloom is finished.
- Will reblooming irises bloom again in their first year?
- It’s possible, but not very likely. A newly planted iris will spend most of its first year establishing a strong root system. You will typically see the reblooming pattern begin in its second or third year in your garden.
- Do I need to divide reblooming irises more often?
- Yes, this is a great question. Because they are such vigorous growers and work so hard, reblooming and late summer iris varieties often need to be divided more frequently, typically every 2-3 years. You can learn how in our guide to dividing irises.