Rhododendron Rhododendron 'Cool Haven'

☠ Toxic to humans
🐾 Toxic to pets
🌸 Blooming
🍪 Not edible
‍🌱 Hard-care
rhododendron 'Cool Haven'


Rhododendron 'Cool Haven' is an attractive evergreen shrub known for its lush, glossy green foliage which forms a dense backdrop for its stunning floral display. The leaves are elongated with slight curvature, creating a leathery texture that feels robust to the touch. The plant blooms profusely with clusters of trumpet-shaped flowers that are a sight to behold. These blossoms can come in a range of colors, but typically feature shades of pink, purple or white with possible speckling or deeper throat markings that add to their visual intrigue. The flowers emerge from beautiful rounded buds that offer a hint of the color spectacle to come. With each cluster being an abundant bouquet, Rhododendron 'Cool Haven' provides a dramatic display that can be a real showstopper in any garden setting. The overall visual effect of the plant is one of lushness and vibrant color, offering a cool haven of serenity and natural beauty.

Plant Info
Common Problems

About this plant

  • memoNames

    • Family


    • Synonyms

      Rhododendron, Azalea

    • Common names

      Rhododendron 'Cool Haven'.

  • skullToxicity

    • To humans

      Rhododendrons are known to contain grayanotoxins. Ingesting any part of the rhododendron can lead to poisoning in humans. Symptoms of rhododendron poisoning may include vomiting, diarrhea, hypersalivation, weakness, coma, hypotension, central nervous system depression, cardiovascular collapse, and potentially death if ingested in large quantities.

    • To pets

      Rhododendrons are toxic to pets due to the presence of grayanotoxins. If pets ingest any part of the rhododendron, they can suffer from symptoms such as vomiting, diarrhea, drooling, weakness, loss of appetite, abdominal pain, depression, and potentially lead to severe poisoning, coma, and death, especially in smaller animals.

  • infoCharacteristics

    • Life cycle


    • Foliage type


    • Color of leaves


    • Flower color


    • Height

      4-5 feet [1.2-1.5 meters]

    • Spread

      4-6 feet [1.2-1.8 meters]

    • Plant type


    • Hardiness zones


    • Native area



  • money-bagGeneral Benefits

    • Ornamental Appeal: The Rhododendron 'Cool Haven' features showy flowers that enhance garden aesthetics.
    • Ease of Care: This plant is relatively easy to care for when provided with the right conditions.
    • Drought Tolerance: Once established, it can withstand periods of dryness.
    • Cold Hardiness: The 'Cool Haven' cultivar is able to survive in cooler climates.
    • Wildlife Attraction: Its flowers can attract pollinators like bees and butterflies.
    • Year-Round Interest: With evergreen foliage, it provides interest in the garden even when not in bloom.
    • Shade Tolerance: It can grow in partial shade, offering flexibility in garden design.
    • Versatility: Suitable for borders, specimen planting, or woodland 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

    • Rhododendrons can be used in fabric dyeing, providing a range of colors from the flowers and leaves when treated with different mordants.
    • The wood of rhododendrons is sometimes used in the crafting of small wooden items such as bowls or handles due to its density and fine grain.
    • Fallen rhododendron petals can be used to create natural confetti for weddings and celebrations that is biodegradable and environmentally friendly.
    • The thick foliage of rhododendrons provides excellent cover and nesting opportunities for various species of birds.
    • Rhododendron leaves can be added to compost piles where their acidity can help balance the pH level of the compost.
    • In landscaping, rhododendrons can be planted to create a visual barrier or privacy screen due to their dense growth habit.
    • In some cultures, rhododendron leaves are used to smoke meats and cheeses, adding a distinct flavor to the food.
    • Rhododendron flowers are sometimes crystallized or used as edible decorations for desserts and cakes.
    • The tannin-rich leaves and bark of rhodendrons can be used in the tanning industry to process leather.
    • The dense root system of rhododendrons can help in soil stabilization and prevent erosion on slopes and banks.

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: Rhododendron often symbolizes caution or danger due to the toxic nature of the plant's leaves and nectar.
    • Elegance and Wealth: With its full, beautiful blossoms, rhododendrons can symbolize elegance and opulence, representing a person's status or refinement.
    • Homecoming and Hospitality: Rhododendron, particularly in certain cultures, can be a symbol of returning home or welcoming someone, as they are often found growing abundantly in certain regions heralding the arrival of spring.

Every 7-10 days
500 - 2500 Lux
Every 2-3 years
Late Winter to Early Spring
As needed
  • water dropWater

    Rhododendrons, including the 'Cool Haven' variety, prefer consistently moist but well-draining soil, so it's important to water when the top inch of soil feels dry to the touch. Generally, this means watering thoroughly once a week, but this can vary depending on climate and soil conditions. During hot or dry spells, the plant may need additional water. Provide about 1 gallon of water for each watering session to ensure deep soil penetration, which encourages proper root growth and health.

  • sunLight

    'Cool Haven' Rhododendron thrives in partial shade conditions, with dappled sunlight being ideal. It should be protected from the harsh afternoon sun, which can scorch its leaves, but it still needs some light to flower optimally. The best spot for this plant would be one that receives morning sunlight and shade in the afternoon, such as the east side of a building or under the light canopy of tall trees.

  • thermometerTemperature

    Rhododendron 'Cool Haven' prefers moderate temperatures and thrives in a range where the daytime temperatures are between 60°F to 70°F. It can tolerate minimum temperatures down to 20°F but can be damaged by extreme cold below this, so it's best to protect the plant in winter if severe frost is expected. The maximum temperature for the plant should not go beyond 80°F for prolonged periods as it may cause heat stress.

  • scissorsPruning

    Prune 'Cool Haven' Rhododendrons to maintain shape and encourage bushier growth after the blooming season ends, usually in late spring or early summer. Removal of spent flower heads promotes next year’s bloom. Pruning can be done annually; and for more extensive shaping, prune every few years. The best time for heavier pruning is after flowering but before new bud set begins.

  • broomCleaning

    As needed

  • bambooSoil

    Rhododendrons, including 'Cool Haven,' require a well-draining, fertile soil with high organic matter. A mix consisting of 50% peat moss and 50% pine bark is ideal. The soil pH should be acidic, between 4.5 and 6.0.

  • plantRepotting

    Rhododendrons like 'Cool Haven' should be repotted every 2 to 3 years as they are slow-growing plants. It's best to repot in the early spring before new growth begins.

  • water dropsHumidity & Misting

    'Cool Haven' Rhododendrons thrive at high humidity levels, ideally between 40% to 60%. They benefit from being in a moist, but not wet, environment.

  • pinSuitable locations

    • Indoor

      Place 'Cool Haven' Rhododendron near bright window; mist regularly.

    • Outdoor

      Plant 'Cool Haven' Rhododendron in dappled shade; shelter from wind.

    • Hardiness zone

      5-9 USDA

  • circleLife cycle

    The Rhododendron 'Cool Haven', commonly known as Cool Haven Rhododendron, begins its life cycle when the seeds germinate, usually in the spring, requiring acidic, well-drained soil and partial shade. Seedlings emerge and develop into juvenile plants, producing a rosette of leaves close to the ground during the first year of growth. As the plant matures, it enters the vegetative stage characterized by the development of woody stems and a lush, evergreen foliage. After a few years, the Cool Haven Rhododendron reaches reproductive maturity and produces clusters of showy flowers, often starting in late spring, which attract pollinators and subsequently develop into seed capsules if fertilization occurs. The flowering period repeats annually, with the plant sometimes experiencing a growth spurt after the flowering season. Eventually, as the plant ages and environmental conditions or disease take their toll, it enters a period of decline, although Rhododendrons can live many years with proper care.

  • sproutPropogation

    • Propogation time

      Late Winter to Early Spring

    • The Rhododendron 'Cool Haven', commonly referred to simply as Rhododendron, can be propagated by several methods, but the most popular one is through cuttings. The best time to take cuttings for propagation is during the late summer to early fall, when the plant's new growth has matured and hardened slightly. To propagate from cuttings, select a healthy, non-flowering shoot and cut a piece about 4 to 6 inches long. Remove the lower leaves and dip the cut end into a rooting hormone. Then, insert the cutting into a pot filled with a mix of peat and perlite or a similar rooting medium. The cutting should be kept moist and in a shaded area until roots develop, which usually takes several weeks. Once the cutting has rooted, it can be transferred to a larger pot or directly into the garden.