Siberian Iris (Iris ‘Dewful’)

Plant: Table of Contents

Siberian Iris (Iris ‘Dewful’): A Comprehensive Guide

Siberian iris, also known as Iris ‘Dewful’, is a stunning perennial plant cherished for its elegant flowers and low-maintenance nature. With its graceful foliage and vibrant blooms, it has become a favorite among gardeners and landscapers alike. In this comprehensive guide, we will delve into the various aspects of cultivating and caring for Siberian iris, while exploring its cultural significance, uses, and the array of environmental conditions that enable its optimal growth.

What is Siberian Iris (Iris ‘Dewful’)?

Siberian iris, scientifically named Iris ‘Dewful’, is a member of the Iris genus, known for its ornamental and horticultural value. Renowned for its strikingly beautiful flowers, this perennial plant is a sophisticated addition to any garden or landscape. It is appreciated for its adaptability to various growing conditions and its ability to thrive with minimal maintenance.

Key Takeaways – Siberian Iris (Iris ‘Dewful’)

  • Varieties: Siberian iris exhibits various color variations and patterns, offering a diverse range of options such as ‘Dewful Blue’, ‘Dewful White’, ‘Dewful Lavender’, and more.

  • Characteristics: The Iris ‘Dewful’ is celebrated for its graceful, narrow, and sword-shaped foliage that forms a tidy clump. Its flowers are typically adorned with falls that diverge from the standards, creating an eye-catching display.

  • Cultivation: Growing Siberian iris requires attention to adequate sunlight, well-draining soil, and proper watering practices. It also requires minimal pruning and is relatively disease-resistant.

  • Uses: Iris ‘Dewful’ is commonly utilized in gardens, landscapes, cut flower arrangements, and even for its potential medicinal properties in traditional medicine.



Siberian iris thrives in moist soil, but it should not be waterlogged. It is important to maintain consistent moisture, particularly during hot and dry periods. Irrigation practices should be adjusted according to rainfall and seasonal conditions. Mulching can aid in retaining soil moisture, especially in warmer climates.


These irises flourish in full sun but also tolerate partial shade. In hot regions, providing afternoon shade can prevent stress on the plants. Ample sunlight is necessary for promoting vigorous growth and prolific flowering.


Siberian iris plants benefit from a balanced fertilizer application in early spring. A slow-release, granular fertilizer with a balanced ratio of nutrients can be incorporated into the soil. Conversely, liquid fertilizers can be applied during the growing season, following the manufacturer’s directions for dilution and frequency.


Well-drained, slightly acidic to neutral soil is ideal for Siberian iris cultivation. Loamy, sandy, or clay soils can be suitable as long as water does not accumulate excessively. Amending the soil with organic matter, such as compost, enhances its fertility and structure, providing an optimal environment for the plants to thrive.


Minimal pruning is required for Siberian iris. After the flowering period, spent flower stems can be removed to maintain tidiness. Additionally, any damaged or diseased foliage should be promptly trimmed to promote plant health. In late fall or early spring, the entire plant can be cut back to the ground to rejuvenate growth.


Siberian iris can be propagated through division or from seed. Division is typically conducted in late summer to early fall, ensuring that each new division possesses healthy roots and foliage. When propagating from seed, it is essential to provide a period of stratification to enhance germination rates.

Container Popularity

Siberian iris is well-suited to container gardening, offering an abundance of vibrant colors and textures to compact spaces. Containers should be of adequate size to accommodate the plant’s root system, and feature drainage holes to prevent waterlogging. Leverage the versatility of container gardening to showcase these elegant irises on patios, balconies, or terrace gardens.

Common Diseases

Despite being relatively disease-resistant, Siberian iris can occasionally be afflicted by fungal diseases such as leaf spot and rot. Adequate air circulation, proper watering, and sanitation practices can mitigate the risk of these diseases.

Disease Diagnosis

Common signs of fungal infection include the development of discolored, spotted, or wilted foliage. Furthermore, the presence of rot or dark lesions on the rhizomes may indicate a disease issue. Timely diagnosis and targeted treatment can prevent the spread of diseases within the planting area.

Common Pests

Siberian iris plants are generally resistant to pests, but they can still fall prey to aphids, thrips, and iris borers. Vigilance is crucial for early pest detection, and appropriate measures should be taken to deter and manage these potential threats.

Botanist’s Tips

  • Choose a planting location that receives sufficient sunlight and provides well-drained soil for optimal growth.

  • Regular deadheading of spent flowers can prolong the blooming period and promote continuous flower production.

  • Consider companion planting with other perennials, such as daylilies and ornamental grasses, to create visually captivating garden compositions.

  • When dividing Siberian iris, ensure that each division possesses a healthy portion of roots and green foliage to facilitate successful establishment.

  • Incorporate mulch around the base of the plants to insulate the soil, moderate temperature fluctuations, and inhibit weed growth.

Fun Facts

  • Siberian iris varieties were historically cultivated for their medicinal properties, with uses ranging from treating skin conditions to serving as a diuretic.

  • The intricate markings and vibrant hues of Siberian iris petals have made them a popular subject in floral art and decorative designs throughout history.

  • The hardiness of Siberian iris has contributed to its enduring presence in various cultural folklore and traditions around the world.

Links to External Resources

For further exploration, the following resources provide valuable information on cultivating and appreciating Siberian iris:

  1. American Iris Society: Features a wealth of information on different irises, including resources for gardening enthusiasts and iris enthusiasts.

  2. The Royal Horticultural Society – Iris: An extensive database of plant profiles and cultivation advice for various Iris species, including Iris ‘Dewful’.

  3. University of California Integrated Pest Management Program – Aphids: Provides detailed insights into aphid biology, management, and integrated pest management strategies.

  4. North Carolina State Extension – Iris Leaf Spot: Offers valuable guidance on diagnosing and managing leaf spot diseases in irises, including preventive measures.

  5. The Spruce – Siberian Iris (Iris sibirica): A comprehensive plant profile focusing on the growth requirements and characteristics of Siberian iris in various gardening settings.

  6. Botanical Gardens Worldwide: A global directory of botanical gardens that may feature collections of Iris ‘Dewful’ and other iris varieties, enabling enthusiasts to appreciate the plant in a curated environment.

In conclusion, Siberian iris (Iris ‘Dewful’) stands out as an enchanting, versatile, and resilient plant that enriches landscapes and gardens with its captivating allure. By understanding its cultural significance, cultivation requirements, and diverse uses, enthusiasts can embark on a rewarding journey of incorporating this botanical gem into their horticultural endeavors.

The comprehensive guide serves as an in-depth resource for plant enthusiasts to explore the diverse facets of Siberian iris (Iris ‘Dewful’). It encompasses an array of topics, from cultivation practices to historical significance, providing valuable insights for individuals seeking to cultivate and appreciate this exquisite perennial plant. Each section offers detailed information accompanied by relevant tips and external resources, fostering a holistic understanding of Siberian iris and its multifaceted appeal.

Picture of Peter Taylors

Peter Taylors

Expert botanist who loves plants. His expertise spans taxonomy, plant ecology, and ethnobotany. An advocate for plant conservation, he mentors and educates future botanists, leaving a lasting impact on the field.