Rhododendron Rhododendron 'Doctor M. Oosthoek' (M)

☠ Toxic to humans
🐾 Toxic to pets
🌸 Blooming
🍪 Not edible
‍🌱 Hard-care
rhododendron 'Doctor M. Oosthoek'


The Rhododendron 'Doctor M. Oosthoek' is a type of azalea characterized by its stunning floral displays. It flaunts large, showy blossoms that come in a brilliant shade of pink. The flowers are often adorned with a deeper pink or reddish-blotch which adds contrast and depth to the blooms. Each flower exhibits a funnel shape with wavy edges, giving it a pleasing, ornamental look. The foliage of this azalea consists of glossy, dark green leaves that provide a rich backdrop to the bright flowers. The leaves are elliptical, with pointed tips and smooth margins, contributing to the plant's overall lush appearance. The branches form a dense, well-shaped shrub that showcases the flowers to their best advantage when in bloom. With its striking floral presentation and attractive foliage, the 'Doctor M. Oosthoek' azalea is a standout plant that receives admiration for its beauty in gardens and landscapes.

Plant Info
Common Problems

About this plant

  • memoNames

    • Family


    • Synonyms

      Doctor M. Oosthoek Rhododendron

    • Common names

      Rhododendron 'Doctor M. Oosthoek'

  • skullToxicity

    • To humans

      Rhododendron 'Doctor M. Oosthoek' (M) belongs to the Rhododendron genus, commonly referred to as rhododendrons. Rhododendrons are known to be toxic to humans if ingested. The plant contains grayanotoxins that affect sodium channels in cell membranes, leading to toxicity. Symptoms of rhododendron poisoning can include nausea, vomiting, drooling, diarrhea, weakness, loss of energy, depression of the central nervous system, coma, and potentially death, although mortality is rare. It is important to avoid consuming any part of this plant.

    • To pets

      Rhododendron 'Doctor M. Oosthoek' (M) is part of the Rhododendron genus, commonly known as rhododendrons. These plants are toxic to pets, including dogs, cats, and horses. They contain grayanotoxins that can disrupt normal cellular function, leading to toxicity if ingested. In pets, symptoms of rhododendron poisoning can range from mild to severe and may include drooling, vomiting, diarrhea, weakness, staggering, loss of appetite, abdominal pain, depression, low blood pressure, tremors, seizures, coma, and potentially even death. Immediate veterinary attention is required if a pet ingests any part of a rhododendron plant.

  • infoCharacteristics

    • Life cycle


    • Foliage type


    • Color of leaves


    • Flower color


    • Height

      4 feet (1.2 meters)

    • Spread

      4 feet (1.2 meters)

    • Plant type


    • Hardiness zones


    • Native area



  • money-bagGeneral Benefits

    • Ornamental Value: Rhododendrons are widely appreciated for their spectacular clusters of large, colorful blooms which can enhance the aesthetic appeal of gardens and landscapes.
    • Variety of Colors: They come in a range of colors from pinks to purples adding variety to the garden color palette.
    • Attracts Pollinators: Rhododendrons attract bees and butterflies, which are important pollinators for many plants in the garden ecosystem.
    • Long Blooming Period: They often have a long flowering period in spring, providing long-lasting visual interest.
    • Erosion Control: The shrub's root system can help stabilize soil and prevent erosion on slopes or in areas with loose soil.
    • Privacy and Screening: Dense foliage can serve as a natural privacy screen or windbreak.
    • Low Maintenance: Rhododendrons require minimal pruning and are relatively low maintenance once established in the right conditions.
    • Year-Round Interest: Evergreen varieties, like some rhododendrons, provide year-round greenery even in colder seasons.
    • Habitat for Wildlife: They can offer shelter and nesting sites for birds and other wildlife within their dense foliage.
    • Resilience to Pests: Rhododendrons are generally resistant to pests and diseases, making them a robust choice for many gardens.

  • 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

    • Wildlife Habitat: Rhododendron is known to provide a natural habitat for various species, offering shelter and nesting sites.
    • Erosion Control: The dense rooting system of rhododendron can help stabilize soil and prevent erosion on slopes.
    • Ink Production: The flower's pigments can sometimes be used to make natural dyes or inks for art projects.
    • Photography Subject: With its stunning blooms, rhododendron is often used by photographers as a subject for botanical photography.
    • Theme Gardens: Rhododendron can be used in themed gardens, such as Asian-inspired landscapes, due to its origins.
    • Fragrance Extraction: Although not as common as other floral sources, rhododendron may be used in the production of essential oils for perfumery.
    • Culinary Garnish: The blooms, if deemed safe for a particular variety, may be used as an ornamental addition to salads or dishes.
    • Winter Interest: Some rhododendron varieties retain their leaves in winter, providing greenery in otherwise bare gardens.
    • Literary Inspiration: The beauty of rhododendrons has been mentioned in poetry and literature, serving as a muse to writers.
    • Sound Barrier: Thick rhododendron hedges can help to reduce noise pollution by acting as a natural sound barrier.

Interesting Facts

  • bedFeng Shui

    The Rhododendron is not used in Feng Shui practice.

  • aquariusZodiac Sign Compitability

    The Rhododendron is not used in astrology practice.

  • spiralPlant Symbolism

    • Beware: Rhododendrons are often associated with caution or danger due to the fact that many parts of the plant are toxic if ingested.
    • Warning: Similarly, they can symbolize a warning to pay attention to what may seem beautiful but is actually harmful.
    • Abundance and Wealth: The full, lush blooms of the Rhododendron commonly symbolize an abundance of beauty or wealth.
    • Elegance and Dignity: Due to their majestic appearance, Rhododendrons can represent elegance and dignity.
    • Survival: As Rhododendrons are hardy plants that can grow in challenging environments, they may also symbolize one's ability to persevere and survive through difficulties.
    • Passion: Some cultures associate the Rhododendron's vivid flowers with passion, especially when given as a gift.
    • Homecoming and Rejuvenation: In certain traditions, the Rhododendron is a herald of spring, symbolizing a return to life or a homecoming.

Every 1-2 weeks
500 - 2500 Lux
Every 2-3 years
Spring-Early Summer
As needed
  • water dropWater

    The Rhododendron, commonly referred to as azalea, should be watered deeply to ensure the roots can access moisture, approximately every 7-10 days depending on weather conditions. In the absence of rainfall, water with about one inch of water, which is roughly equivalent to 0.6 gallons per square foot of soil. During the growing season, in spring and summer, they may require more frequent watering, especially if they are newly planted or in containers. Make sure to water the plant at its base, avoiding wetting the foliage to prevent disease.

  • sunLight

    Azaleas, such as the Rhododendron 'Doctor M. Oosthoek', thrive in dappled shade or part sun, where they receive filtered sunlight for part of the day. Direct morning light with afternoon shade is ideal for promoting good bloom while protecting the leaves from harsh sun. An eastern or northeastern exposure is often considered best for these plants.

  • thermometerTemperature

    Azaleas favor moderate temperatures and perform well in a range between 50°F and 80°F. While they can survive short dips to about 20°F, prolonged exposure to temperatures below this can cause damage. The ideal temperature for azaleas to flourish is within the 60°F to 70°F range.

  • scissorsPruning

    Azaleas benefit from pruning to maintain shape, encourage bushier growth, and enhance flowering. Prune immediately after they finish blooming in spring to avoid cutting off next year's flower buds. Remove dead or diseased branches, and thin out old wood to let light into the center of the plant.

  • broomCleaning

    As needed

  • bambooSoil

    The best soil mix for Rhododendron, commonly known as Azalea, is well-draining, high organic matter, with a slightly acidic pH of 4.5 to 6.0. A blend of 50% pine bark, 30% perlite, and 20% peat moss is often recommended to provide the right conditions.

  • plantRepotting

    Azaleas typically need repotting every 2 to 3 years. It’s best done in late winter or early spring, just before new growth starts.

  • water dropsHumidity & Misting

    Azaleas prefer high humidity levels, ideally around 50-60%. Maintaining a humid environment is crucial for their well-being, especially when grown indoors.

  • pinSuitable locations

    • Indoor

      Place Azalea in bright, indirect light indoors; keep soil moist.

    • Outdoor

      Azaleas thrive in dappled shade outdoors; protect from harsh sun.

    • Hardiness zone

      5-8 USDA

  • circleLife cycle

    Rhododendron 'Doctor M. Oosthoek', commonly known as Azalea, begins its life cycle when a seed germinates, typically in a well-drained, acidic soil environment that mimics its natural woodland habitat. The seedling emerges and establishes itself, slowly growing into a young plant through a process that heavily depends on appropriate light, water, and nutrients. Over several years, the Azalea matures, developing a robust root system and woody branches, while foliage becomes more dense with evergreen or deciduous leaves depending on the variety. The mature Azalea reaches reproductive maturity and produces flowers, often in striking colors, which after pollination form seeds that can be dispersed to propagate the next generation. This perennial shrub can live and bloom annually for many years, given that it is protected from extreme conditions like harsh winters or droughts. Eventually, as with all living organisms, the Azalea may succumb to age, disease, or environmental stresses, completing its lifecycle.

  • sproutPropogation

    • Propogation time

      Spring-Early Summer

    • The Rhododendron 'Doctor M. Oosthoek', often referred to simply as Rhododendron, is typically propagated through semi-hardwood cuttings. This method is most effective when undertaken in the late summer after blooms have faded and new growth has begun to harden, yet while the wood is still somewhat flexible. Cuttings should be taken from healthy plants and should be about 4 to 6 inches long, including several leaf nodes. The lower leaves are removed, and the cut end can be dipped in a rooting hormone powder or gel to encourage root development. The prepared cutting is then placed in a well-draining potting mix, ensuring that the leaf nodes are buried. A high humidity environment is crucial, often achieved by covering the cutting with a plastic bag or dome to retain moisture. Roots typically develop within a few weeks to a few months, after which the new Rhododendron plant can be transplanted to a more permanent location.