Royal William Rose Rosa Royal William = 'Korzaun' (HT)

👤 Non-toxic to humans
🐾 Non-toxic to pets
🌸 Blooming
🍪 Not edible
‍🌱 Hard-care
rose [Royal William]


The Rosa Royal William, also commonly referred to as the Royal William rose, is a stunning variety known for its deep, velvety red blossoms. The flowers of this plant typically have a classic, cupped form that gradually opens up to a fuller bloom with numerous densely-packed petals as they mature. The petals themselves are known for their rich and vibrant color as well as their slightly glossy finish, which can give the appearance of almost shimmering in the sunlight. The foliage of the Royal William rose is also quite striking, with dark green, glossy leaves that serve as a beautiful backdrop to the stunning flowers. The leaves tend to be somewhat ovate in shape with a pointed tip, and they are arranged alternately along the stems, providing a lush, green contrast to the red blooms. The overall look of the plant is one of abundant blooms and healthy foliage. It exudes a sense of luxury and opulence and is often appreciated for its intensely colored flowers and pleasant fragrance. The Royal William rose, with its showy blooms and classic rose characteristics, is a favorite among garden enthusiasts for its aesthetic appeal and is often used in formal garden settings, as well as in cut flower arrangements.

Plant Info
Common Problems

About this plant

  • memoNames

    • Family


    • Synonyms

      Royal William Rose

    • Common names

      Rosa 'Korzaun'

  • skullToxicity

    • To humans

      The Rosa 'Royal William', also known as a Hybrid Tea Rose, is not considered toxic to humans. Ingesting parts of this plant is unlikely to cause serious poisoning. However, as with many plants, consuming large quantities of rose leaves or petals may cause stomach upset or discomfort due to the fibrous plant material. It is also advisable to handle roses with care due to their thorns, which can cause physical injury.

    • To pets

      The Rosa 'Royal William', commonly known as a Hybrid Tea Rose, is considered non-toxic to pets. Ingesting the petals or leaves of roses is generally not harmful to animals like dogs and cats. However, the thorns can cause injuries to the mouth and gastrointestinal tract if chewed or swallowed. It is also important to note that while the rose itself is not poisonous, any pesticides or chemicals used on the plant may be harmful to pets if ingested.

  • infoCharacteristics

    • Life cycle


    • Foliage type


    • Color of leaves


    • Flower color


    • Height

      3 feet 4 inches (100-120 cm)

    • Spread

      2 feet 5 inches (75 cm)

    • Plant type


    • Hardiness zones


    • Native area



  • money-bagGeneral Benefits

    • Attractive Blooms: Produces vibrant, richly colored flowers that can enhance the beauty of any garden or landscape.
    • Fragrant: The flowers emit a pleasant scent, adding a layer of olfactory enjoyment to its visual appeal.
    • Pollinator Friendly: Attracts beneficial pollinators such as bees and butterflies, supporting local ecosystems.
    • Hardy Plant: Tends to be resilient and can thrive in a variety of climates and conditions with proper care.
    • Cut Flower Use: Blossoms are suitable for cutting and creating bouquets, adding aesthetic value to indoor environments.
    • Landscape Design Versatility: Can be used in multiple garden design styles, including formal, cottage, and contemporary landscapes.
    • Long Blooming: Often has a lengthy blooming period, providing color for an extended season.
    • Cultural Significance: Roses are often associated with love and beauty, carrying a deep historical and cultural significance.

  • 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

    • The petals of the Royal William rose can be used to make natural dyes for fabrics, providing a soft pink to reddish hue depending on the concentration.
    • Rose petals, including those of the Royal William, are often added to potpourris for their fragrance and color, creating a visually appealing and aromatic household item.
    • Rose water made from Royal William petals can be used as a natural flavoring in culinary dishes, imparting a subtle floral note to desserts like pastries and puddings.
    • The rose hips, which are the fruit of the Royal William rose, can be used in craft projects as natural beads once they are dried and have their seeds removed.
    • Rose petals from the Royal William can be used to add a decorative and edible element to salads, providing a splash of color and a hint of flavor.
    • The strong fragrance of Royal William roses makes them suitable for creating homemade scented sachets to freshen up drawers and closets.
    • Royal William rose petals can serve as a natural confetti at celebrations, offering an environmentally friendly alternative to traditional paper or plastic confetti.
    • In the art of flower pressing, Royal William rose petals are an exquisite choice due to their vibrant color and relative durability when dried and pressed.
    • During special events and ceremonies, such as weddings, the Royal William rose petals can be used to decorate tables or create a petal pathway for a romantic touch.
    • The Royal William rose can be used in photography as a prop or a backdrop, providing a bold splash of color and natural beauty to enhance the composition.

Interesting Facts

  • bedFeng Shui

    The rose is not used in Feng Shui practice.

  • aquariusZodiac Sign Compitability

    The rose is not used in astrology practice.

  • spiralPlant Symbolism

    • Passion: The rich red color of the Royal William rose typically symbolizes deep passion and enduring love, reminiscent of a romantic and fervent affection.
    • Beauty: Like many roses, the Royal William is often associated with beauty and perfection, representing admiration for physical and inner charm.
    • Courage and Respect: The bold appearance of this rose can signify courage and the deep respect associated with noble feelings and acts.
    • Honor: Royal William roses are sometimes used to pay tribute to someone who is held in high esteem, symbolizing honor and homage.
    • Devotion: The longstanding symbolism of roses as a whole encompasses devotion, making this variety a representation of committed love and fidelity.

Every 2-3 days
2500 - 10000 Lux
Every 2-3 years
Spring to early summer
After blooming
  • water dropWater

    Hybrid Tea Roses, like the Royal William, should be watered deeply and infrequently to encourage root growth. During the growing season, water approximately once every week with about 1 to 1.5 gallons per bush, ensuring the soil is moist but not waterlogged. If the weather is particularly hot or dry, increase watering frequency to twice a week. During the winter months, reduce watering but do not allow the soil to completely dry out. Always water at the base of the plant to avoid wetting the foliage, which can lead to diseases.

  • sunLight

    Hybrid Tea Roses, including the Royal William, thrive in full sunlight. They require at least six hours of direct sunlight daily to bloom optimally. The best spot for these roses would be an open garden area or a bed that receives unfiltered sunlight for the majority of the day. Avoid planting them where they might be shaded by trees or buildings, especially during the morning hours when the sun helps dry dew from the leaves.

  • thermometerTemperature

    Hybrid Tea Roses like the Royal William perform best in moderate temperatures and can survive in USDA zones 5 through 9. They can endure winter lows down to about -20°F. During the growing season, an ideal temperature range is 65°F to 75°F. Extreme heat can be stressful for roses, so some shade during the hottest part of the day can be beneficial to prevent overheating.

  • scissorsPruning

    Pruning Hybrid Tea Roses like the Royal William is essential for maintaining plant health, encouraging blooms, and shaping the bush. It's best to prune early in the spring, after the last frost but before new growth appears. Remove dead or damaged canes and thin out the center of the plant to improve air circulation. Cut back remaining canes by about one-third to one-half, making cuts at a 45-degree angle above outward-facing buds. Prune again lightly after each bloom cycle to remove spent flowers and encourage new ones.

  • broomCleaning

    As needed

  • bambooSoil

    The best soil mix for Hybrid Tea Roses like the Royal William rose should be rich, well-drained, and loamy with a pH of 6.0 to 6.5. Amendments like compost and aged manure will improve soil fertility and structure.

  • plantRepotting

    Hybrid Tea Roses such as the Royal William rose are typically not repotted as they are garden plants. Instead, they may be transplanted every few years if needed.

  • water dropsHumidity & Misting

    Hybrid Tea Roses like Royal William prefer average outdoor humidity levels. They do not require specific humidity control when planted in the garden.

  • pinSuitable locations

    • Indoor

      Keep Hybrid Tea Roses in well-lit spot, ensuring minimum 6 hours of sunlight.

    • Outdoor

      Plant in sunny area with well-draining soil; water deeply but infrequently.

    • Hardiness zone

      5-9 USDA

  • circleLife cycle

    The life of the plant commonly known as Hybrid Tea Rose 'Royal William' begins with a period of dormancy where the plant rests, followed by germination from a seed or growth from a grafted specimen, depending on propagation practices. Once established, the plant enters a vegetative stage, growing stems, leaves, and roots. As it matures, it develops flower buds which bloom into the characteristic large, fragrant red roses of the 'Royal William' variety. After pollination, which can be done by insects or artificially, the flowers may produce hips containing seeds, though many cultivars are sterile and do not set viable seed. The plant then enters a period of senescence where flowers fade and leaves may yellow and drop, and prepares to enter another period of dormancy, often dictated by the colder winter months. This cycle can repeat annually, with proper care allowing the plant to live and bloom for many years.

  • sproutPropogation

    • Propogation time

      Spring to early summer

    • Rosa 'Royal William', commonly known as 'Korzaun', is a hybrid tea rose that can be propagated most commonly by softwood cuttings. This method is typically done in late spring or early summer when new growth is mature enough to be still flexible but not too woody. Cuttings of about 6 to 8 inches (15 to 20 centimeters) are taken from healthy, disease-free plants, making sure they include several leaf nodes. The bottom leaves are removed, and the cut end could be dipped in rooting hormone to encourage root development. The cutting is then planted in a well-draining soil mixture, with the bottom half of the cutting submerged. Conditions must ensure high humidity and consistent moisture, but not waterlogged soil, as this can cause the cutting to rot. A plastic cover or dome can help maintain the appropriate environment for rooting, which may take several weeks.