Tall Bearded Iris Iris 'Blue Luster' (TB)

☠ Toxic to humans
🐾 Toxic to pets
🌸 Blooming
🍪 Not edible
‍🌱 Easy-care
iris 'Blue Luster'


Iris 'Blue Luster' falls within the category of tall bearded irises and is known for its strikingly beautiful flowers. The appearance of the plant is characterized by its captivating blooms. Each flower is distinguished by three upright petals known as "standards," which exhibit a lustrous and rich blue hue that can range from a lighter sky-blue to a deeper royal blue, depending on various growing factors. Below these standards, you will notice the three drooping sepals called "falls" that are also adorned in the same enchanting blue color. These falls often have a slightly deeper shade along their edges or in veining patterns, imparting an added dimension and contrast to the flower. The falls may sometimes showcase a beard, which is a fuzzy line or area at the center, standing out in a contrasting color like gold or white. This beard might catch the eye, leading to the throat of the flower—the area at the top of the falls and the base of the standards. Surrounding the delicate blooms are the sword-shaped leaves that emanate from the base of the plant. These leaves have a rich green color that forms clumps and complements the vivid blue of the flowers, creating an overall pleasing aesthetic. This iris variety is a perennial, returning year after year to add its distinct charm to the garden landscape during its blooming season. The beauty of Iris 'Blue Luster' lies not in its measurements but in the impression it leaves through its distinct coloration and form, making it a coveted choice among garden enthusiasts.

Plant Info
Common Problems

About this plant

  • memoNames

    • Family


    • Synonyms

      Tall Bearded Iris, Bearded Iris

    • Common names

      Iris 'Blue Luster'

  • skullToxicity

    • To humans

      The Tall Bearded Iris, commonly referred to by its cultivar 'Blue Luster', is not typically considered highly toxic to humans. However, like many irises, it contains compounds that can cause irritation. If ingested, parts of the plant, particularly the rhizomes, can lead to symptoms such as nausea, stomach pain, vomiting, and diarrhea. Contact with the sap may also cause skin irritation or an allergic reaction in sensitive individuals. Ingesting large amounts of Tall Bearded Iris plant material could result in more serious gastrointestinal distress or other symptoms, so it is recommended to handle these plants with care and avoid ingestion.

    • To pets

      The Tall Bearded Iris, often known simply as the Bearded Iris, is considered to be mildly toxic to pets, including cats and dogs. Ingesting the plant, especially the rhizomes, can lead to symptoms such as drooling, vomiting, diarrhea, lethargy, and in some cases, abdominal pain. While the toxicity level is generally low, it is advisable to prevent pets from chewing on or ingesting any parts of the Bearded Iris to avoid the potential for gastrointestinal upset or more serious health concerns. If you suspect your pet has ingested Bearded Iris, it is best to consult with a veterinarian.

  • infoCharacteristics

    • Life cycle


    • Foliage type


    • Color of leaves


    • Flower color


    • Height

      2-3 feet (60-90 cm)

    • Spread

      1-2 feet (30-60 cm)

    • Plant type


    • Hardiness zones


    • Native area



  • money-bagGeneral Benefits

    • Ornamental Appeal: Iris 'Blue Luster' offers striking blue flowers that add a splash of color to any garden or landscape setting.
    • Low Maintenance: Once established, this variety of iris is relatively easy to care for, requiring minimal attention beyond basic watering and occasional feeding.
    • Drought Tolerance: Iris 'Blue Luster' is quite drought-resistant, making it suitable for climates with less rainfall or for gardeners who prefer plants that do not require constant watering.
    • Attracts Wildlife: The vibrant blooms attract pollinators such as bees and butterflies, promoting biodiversity in your garden.
    • Seasonal Interest: This iris variety typically blooms in the late spring to early summer, providing seasonal interest in the garden when many other plants are not yet in flower.
    • Versatility in Landscape Design: Iris 'Blue Luster' can be planted in borders, as part of mass plantings, or even in containers, offering flexibility in garden design.
    • Cold Hardy: It is capable of withstanding colder climates, making it a suitable addition to many gardens in temperate regions.
    • Longevity: Irises are known for their longevity and can continue to bloom year after year with the right care, making them a lasting investment for gardeners.
    • Deer-Resistant: This iris is generally resistant to deer, which can be especially beneficial in areas where deer browsing is a common problem.
    • Cut Flower Potential: The blossoms of Iris 'Blue Luster' make beautiful cut flowers for indoor arrangements, extending their value beyond the garden.
    • Showy Seed Pods: After flowering, it produces interesting seed pods that add a different element of visual interest to the garden.

  • medicalMedical Properties

    This plant is not used for medical purposes.

  • windAir-purifying Qualities

    This plant is not specifically known for air purifying qualities.

  • leavesOther Uses

    • Iris petals can be used to create natural dyes, offering a range of colors depending on the mordant used during the dyeing process.
    • The robust, fibrous leaves of irises can be woven into baskets, mats, or even sandals, showcasing their versatility in crafting.
    • Iris rhizomes can be dried and powdered to use as a natural abrasive in polishing metal or wood.
    • The flower's unique shape makes it an ideal model for botanical studies and illustration practices focusing on floral anatomy.
    • Dried iris flowers are often incorporated into potpourri mixes, contributing a subtle and pleasant fragrance to the blend.
    • Gardeners sometimes use the cut stems of irises as natural stakes or supports for other, more delicate plants in their garden.
    • When dried, the seed pods of irises can be used in decorative arrangements or as part of homemade wreaths and other craft projects.
    • Iris 'Blue Luster' can be part of a rain garden, as many iris species are tolerant of wet conditions and can help in water management landscaping.
    • The distinct form and color of iris flowers can be incorporated into textile designs and patterns for fabrics, wallpapers, and home decor.
    • Iris blooms are sometimes used as a natural source for inks, especially for traditional art forms that value organic and plant-based materials.

Interesting Facts

  • bedFeng Shui

    The Iris is not used in Feng Shui practice.

  • aquariusZodiac Sign Compitability

    The Iris is not used in astrology practice.

  • spiralPlant Symbolism

    • Hope & Faith: Irises generally symbolize hope and faith, reflecting a trust in the future and the expectation of positive outcomes.
    • Wisdom: Often associated with wisdom, the iris can represent knowledge, learning, and the quest for enlightenment.
    • Courage: With its bold appearance, the iris may symbolize courage and admiration for someone's bravery.
    • Royalty: The royal blue color of 'Blue Luster' suggests nobility and regal bearings, making it a symbol of sovereignty and elegance.
    • Purity & Heaven: The iris is sometimes associated with the Virgin Mary in Christian iconography, representing purity. Its blue color also hints at a heavenly realm.

Every week
2500 - 10000 Lux
Every 2-3 years
Spring-Early Summer
As needed
  • water dropWater

    Tall Bearded Iris, commonly known as 'Blue Luster', should be watered deeply but infrequently to encourage strong root growth. During the growing season, water the irises once a week with about an inch of water, which equates to roughly half a gallon per square foot. Adjust the watering schedule to accommodate for rainfall; irises prefer not to sit in water-logged soil. During the dormant season, reduce watering to a minimum, only providing supplemental water if there are prolonged dry spells.

  • sunLight

    Tall Bearded Iris, like 'Blue Luster', thrives in full sunlight. The ideal location is where the plant can receive at least six hours of direct sun each day. Areas with morning sunlight and afternoon shade are also suitable, but prolong exposure to strong afternoon sun will benefit the plant's growth and bloom cycle.

  • thermometerTemperature

    The Tall Bearded Iris 'Blue Luster' prefers temperate climates and can tolerate a wide range of temperatures, from approximately 14°F to 95°F. However, the ideal growing temperatures are between 55°F and 75°F for optimal growth and flowering. Ensure the plant is well mulched if extreme cold is expected to prevent damage to the rhizomes.

  • scissorsPruning

    Prune the Tall Bearded Iris 'Blue Luster' by removing spent flower stems at their base after blooming to promote a tidy appearance and prevent seed formation. Cut back the foliage to about 6 inches above the ground in the fall to minimize overwintering pests and diseases. Pruning is typically done annually, with the best time being immediately after flowering and again in late autumn if necessary.

  • broomCleaning

    As needed

  • bambooSoil

    Tall Bearded Iris, including 'Blue Luster', requires well-draining soil enriched with compost or humus. A slightly acidic to neutral pH of 6.5 to 7 is ideal for optimal growth. Mix in perlite or sand to enhance drainage.

  • plantRepotting

    Tall Bearded Iris such as 'Blue Luster' don't typically need frequent repotting and can be done every 3 to 5 years, usually after flowering in late spring to early summer.

  • water dropsHumidity & Misting

    Tall Bearded Iris 'Blue Luster' is tolerant of a wide range of humidity levels and does not require high humidity to thrive; average outdoor conditions are usually sufficient.

  • pinSuitable locations

    • Indoor

      Ensure bright light and good airflow for indoor Tall Bearded Iris.

    • Outdoor

      Plant in sunny spot with well-draining soil and space for rhizome expansion.

    • Hardiness zone

      3-9 USDA

  • circleLife cycle

    The Iris 'Blue Luster', also known as Tall Bearded Iris, begins its life as a seed which, when sown, germinates in moist soil during warm weather. As it sprouts, it develops a root system and foliage in the form of sword-like leaves, before forming a rhizome—a horizontal stem that grows underground and stores nutrients. In its vegetative state, the iris expands through the growth of these rhizomes, which can be divided and replanted to propagate the plant. It reaches maturity within two to three years, during which the plant produces tall, sturdy flowering stalks in late spring to early summer, showcasing the striking blue flowers that give this iris its name. After flowering, the plant goes into a dormancy phase during late summer to winter, conserving energy for the next growing season. Each cycle of vegetative growth and dormancy prepares the iris for the subsequent year's bloom, with proper care allowing them to thrive and multiply for many years.

  • sproutPropogation

    • Propogation time

      Spring-Early Summer

    • For the Iris 'Blue Luster', which is a Tall Bearded Iris, the most popular method of propagation is through division of the rhizomes. This is best done shortly after flowering, typically in late summer to early fall. To propagate, start by carefully digging up the clumps of irises and gently shaking or washing off the soil. Using a sharp knife, divide the rhizomes by cutting them apart, ensuring that each section has at least one fan of leaves and a portion of the roots. Trim the leaves to a length of about 6 inches (15 cm) to reduce moisture loss. The new divisions should then be replanted promptly, positioning the rhizomes so they are slightly exposed on the soil's surface, and spaced roughly 12 to 24 inches (30 to 60 cm) apart to allow for adequate growth and air circulation. This will encourage the development of new, vigorous plants that can continue to produce the plant's characteristic lustrous blue flowers.