Japanese Red Diamond Guava Plant

red guava

Japanese Red Diamond Guava Plant is a botanical marvel worthy of global admiration. Native to eastern Asia, this vibrant flowering shrub boasts crimson blooms and gemstone fruit that stop onlookers in their tracks.

Beyond outstanding ornamental appeal, the Japanese Red diamond guava (Psidium cattleianum var. lucidum) offers a rare feast for the senses, perfuming gardens with sweet nectar while dazzling with nature's diamonds in vibrant red hues.

As an exotic introduction to Western gardens, this unique evergreen shrub has captured worldwide attention for its sheer beauty and valuable attributes.

This article explores the astonishing qualities and optimal growing and care tips of the prized Japanese Red diamond guava to help others experience the wonder of its stunning scarlet blooms and flavors bursting from diamond-shaped fruit.

Key Features 

Scientific Name: Psidium cattleianum var. lucidum 'Japanese Red'

Common Names: Japanese Red Ixora, Red Ixora, Lemon Guava, Red Guava 

Color: Bright scarlet red flowers

Height: 2-3 feet (60-90 cm)

Spread: 2-3 feet (60-90 cm)

Flowering Season: Spring through fall

What is Japanese Red Guava

The Japanese Red Diamond Gauva Plant is a compact, flowering shrub prized for its scarlet red blooms. Native to tropical and subtropical regions of Asia and Africa, it forms a dense, rounded bush bearing clusters of tiny, tubular flowers. This ixora variety blooms profusely from spring through fall. Its lustrous green leaves and bright flowers attract hummingbirds and butterflies.

The Japanese Red Diamond Gauva Plant thrives in partial shade and well-draining soil. It is drought and heat tolerant once established. This low-maintenance shrub provides vivid tropical color without being invasive or requiring a large space.


Used widely in warm-climate landscaping as a accent or border plant. Thrives as a potted specimen on patios. Pairs well with other flowers like bougainvillea, hibiscus or purple queen in the landscape.

All plant parts are non-toxic to humans and pets. Propagation is by stem cuttings. Makes for a colorful, long-blooming addition to any tropical or semitropical garden.

Nutritional Value

Japanese Red Diamond Guava not only looks appealing but also packs a nutritional punch. Here are some of its notable nutrients:

  • Fiber:

    Guava is high in dietary fiber, aiding digestion and promoting a feeling of fullness.

  • Vitamin C:

    The fruits are a rich source of vitamin C, supporting immune function and acting as a powerful antioxidant.

  • Essential Nutrients:

    The fruit contains vitamins A and E, folate, potassium, and magnesium, contributing to overall health and well-being.

How to Grow and Maintain Japanese Red Diamond Guava

  1. Location

    Choose a sunny location and ensure that it receives at least 6-8 hours of direct sunlight daily.

    This plant thrives in warm climates and is sensitive to cold temperatures, so protect it from strong winds and frost.

  2. Soil

    Plant your guava tree in well-draining soil with a slightly acidic pH, typically between 6.5 and 7.5.

    If your soil is heavy or clayey, improve drainage by adding organic matter like compost or well-rotted manure.

    This will help create a loose and fertile soil environment, promoting healthy root development.

  3. Pot selection

    Get a container that is at least 18 inches in diameter and depth to accommodate the growth of the tree.

    A larger pot size, such as 24 inches or more, can also be beneficial as it allows for more root space and better stability for the plant.

  4. Remember to choose a pot with drainage holes to prevent waterlogging and ensure proper drainage. This will help maintain a healthy root system and prevent potential root rot issues.

  5. Watering

    Water your guava tree deeply and regularly, especially during dry spells.

    Avoid over-watering, as guava plants are susceptible to root rot.

    Allow the soil to dry out between waterings to prevent waterlogged conditions. A good practice is to water the plant well and then wait until the top inch of soil feels dry before watering again.

  6. Temperature

    The ideal temperature range for healthy growth is 15-25°C (59-77°F).

    It can tolerate brief dips slightly lower or higher, down to 5°C (41°F) or up to 30°C (86°F). Frost and freeze damage will occur below 0°C (32°F).

  7. Humidity

    Hailing from subtropical coastal habitats, Japanese Red Guava thrives with moderate-to-high humidity levels around 50-75%.

    This is helpful to prevent moisture loss, especially through leaf surfaces.

    The plant may struggle or drop leaves under very dry indoor conditions with humidity below 30% unless consistently watered.

    Mist foliage in drier times to boost humidity levels around the guava. Place the pot on a pebble-filled tray with water to create high humidity microclimates.

    Humidity trays should not directly touch the pot's base for risk of root rot.

  8. Pruning

    Prune your guava tree in late winter or early spring before new growth begins.

    This will help maintain its shape, improve air circulation, and remove any dead, diseased, or crossed branches.

    Pruning can also stimulate new growth and promote better fruit production.

    Use clean and sharp pruning tools to make clean cuts, and dispose of pruned branches properly.

  9. Pest Control

    Monitor your guava tree regularly for pests like fruit flies, scale insects, and aphids.

    If you notice any infestations, take appropriate measures to control them.

    You can use organic insecticidal soaps or oils, introducing beneficial insects like ladybugs or lacewings, or employing physical barriers such as fine mesh or bags to protect developing fruits from fruit flies.

  10. Common Diseases

    Keep an eye out for common diseases that may affect your Japanese Red Diamond Guava plant, such as anthracnose and powdery mildew.

    To prevent these diseases, ensure proper spacing between plants to allow for good air circulation.

    If you notice any signs of disease, promptly remove and dispose of affected plant parts.

    In severe cases, you may need to apply copper-based fungicides or appropriate organic treatments as recommended.

By following these guidelines for location, soil, watering, pruning, pest control, and disease prevention, you can successfully grow and maintain a healthy Japanese Red Diamond Guava plant in your garden.

With proper care, you'll be rewarded with a bountiful harvest of delicious and nutritious guavas.

Japanese Red Diamond Guava Propagation Method

The Japanese Red diamond guava can be propagated through seed germination or stem cuttings.

Seed Germination:

  • Collect ripe guava fruits and extract the seeds.
  • Clean the seeds by removing any fruit pulp and allow them to air dry.
  • Fill a seed tray or small pots with a well-draining seed-starting mix.
  • Plant the seeds about 1/4 inch deep and cover them lightly with soil.
  • Keep the soil consistently moist and place the tray or pots in a warm location with indirect sunlight.
  • Germination can take anywhere from 2 to 8 weeks.
  • Once the seedlings have developed a few leaves, they can be transplanted into individual pots or a suitable outdoor location.

Stem Cuttings:

  • Take stem cuttings from a healthy, mature Japanese Red diamond guava plant during the spring or early summer.
  • Use a sharp, sterilized knife or pruning shears to cut a 6 to 8-inch section of a non-flowering stem.
  • Remove any leaves from the lower half of the cutting.
  • Dip the cut end of the stem into a rooting hormone powder to promote root development (optional).
  • Fill a pot with a well-draining potting mix and create a hole for the cutting.
  • Insert the cutting into the hole, firm the soil around it, and water thoroughly.
  • Place the pot in a warm, bright location with indirect sunlight.
  • Mist the cutting regularly to maintain humidity and prevent drying out.
  • Rooting can take several weeks to a couple of months. You can gently tug on the cutting to check for resistance, indicating root development.
  • Once roots have formed, the cutting can be transplanted into a larger pot or a suitable outdoor location.

Remember to provide appropriate care and maintenance for the propagated plants, following the guidelines for watering, fertilizing, and pruning as mentioned above.


Guavas, including different varieties like the Japanese Red Diamond, are generally safe for human consumption when consumed in moderation, but it's advisable to consult with a veterinarian regarding its suitability for pets.

If you have concerns about specific toxicity or potential allergic reactions, it's best to seek guidance from reputable sources or medical professionals who can provide personalized advice based on your unique circumstances.



The Japanese Red Diamond Guava plant is a beautiful addition to any garden, offering visual appeal and a range of potential health benefits.

By following the tips mentioned, you can successfully grow and maintain this delightful plant. Remember to address any pest or disease issues promptly to ensure the plant's health and vitality.

With proper care, you'll be rewarded with an abundance of juicy, flavorful guavas to enjoy.


  1. What kind of fertilizer do guava trees need?

    Guava trees benefit from a balanced fertilizer with an NPK (nitrogen, phosphorus, and potassium) ratio of around 8-8-8 or 10-10-10.

    Additionally, they require micronutrients like iron, manganese, and zinc. You can use a slow-release fertilizer specifically formulated for fruit trees or a general-purpose fertilizer.

    Follow the instructions on the packaging for application rates and frequency, and fertilize during the growing season.

  2. How long does it take for Japanese Red Guava cuttings to root?

    Japanese Red Guava cuttings typically take around 2 to 4 weeks to root. However, rooting success can vary depending on various factors such as humidity, temperature, and the health of the cutting.

    It is important to provide a suitable rooting environment with proper moisture and warmth to encourage successful rooting.

  3. How long does it take for red guava to bear fruit?

    The time it takes for a red guava tree to bear fruit can vary. Generally, it can take anywhere from 2 to 4 years for a guava tree to start producing fruit after planting.

    The exact timing depends on factors such as the tree's age at planting, growing conditions, and the specific variety of guava.

    Providing optimal care, including proper watering, fertilization, and pruning, can help promote earlier fruit production.

  4. Why is my guava plant dying?

    There can be several reasons why a guava plant may be dying. Common causes include over or under-watering, poor drainage, nutrient deficiencies, pest or disease infestations, extreme temperatures, or improper sunlight exposure.

    It's important to assess the specific symptoms and conditions affecting your guava plant to identify the underlying issue.

    Adjusting watering practices, improving soil drainage, addressing nutrient deficiencies, controlling pests or diseases, and providing suitable growing conditions can help revive a struggling guava plant.

  5. What is the lifespan of a guava tree?

    The lifespan of a guava tree can vary depending on factors such as the specific variety, growing conditions, and care provided.

    On average, guava trees can live for 30 to 40 years or even longer with proper maintenance and care.

    However, it's worth noting that the productivity of the tree may decline after several decades, and rejuvenation through pruning or grafting may be necessary to maintain optimal fruit production.

  6. How do you grow a bigger guava?

    To encourage the growth of a bigger guava tree, consider the following practices:

    • Provide ample sunlight
    • Proper watering
    • Fertilization
    • Pruning
    • Pest and disease management
    • Proper spacing

    By following these practices, you can promote the growth and development of a larger guava tree with improved fruit production.

Next Post Previous Post
No Comment
Add Comment
comment url