Ixora spp.
Ixora is a genus of flowering broadleaf evergreens in the Rubiaceae family, related to gardenias and coffee plants.
Native to tropical Asia, these shrubs thrive in USDA Hardiness Zones 9 to 12, bringing glossy green foliage and long-lasting clusters of bright blooms to the landscape.
Dense clusters of tubular blossoms, known as corymbs, cover the plants in vivid shades of orange, pink, red, yellow, or white.
Each rounded cluster can contain dozens of small flowers, creating a striking pom-pom effect above the lush foliage.
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Depending on the variety, bloom time ranges from spring through early fall, with some types blooming intermittently year-round in frost-free climates.
Each cluster can last six to eight weeks and after the flowers fade, berry-like drupes in shades of red to purple appear, extending the ornamental interest.
Ready to grow this tropical beauty in your garden? Let’s dive into the details:
What You’ll Learn
Plants in the Ixora genus range in size from four to 15 feet tall and three to 10 feet wide.
Popular garden species include Ixora coccinea, or jungle geranium, with fiery red and orange blossoms, I. chinensis, which produces pink, yellow, or red blooms on a smaller frame, and I. finlaysoniana, noted for its large white flower clusters.
Named cultivars like ‘Nora Grant’ and those in the Maui series are especially valued for their tidy growth and reliable flowering.
With an array of drought and salt tolerant options, you’ll find ixora a versatile and functional landscaping choice.
Smaller specimens show well in containers and are excellent additions to beds and borders.
The dense foliage of taller ixora types is suited to informal hedging and perimeter planting for privacy. Artistic gardeners seek its pliable, sturdy branches for bonsai training.
Quick Look
Common name(s): Flame of the woods, Ixora, jungle geranium, Soka flower, West Indian jasmine
Plant type: Flowering broadleaf shrub
Hardiness (USDA Zone): 9-12
Native to: Tropical Asia
Bloom time / season: Spring, summer, intermittently year-round
Exposure: Full sun, partial shade
Soil type: Fertile, loamy, well-draining
Soil pH: 5.0-5.5, slightly acidic
Time to maturity: 4-15 years
Mature size: 4-15 feet tall by 3-10 feet wide (depending on cultivar)
Best uses: Bed, bonsai, border, container, informal hedge, privacy screen, specimen
Taxonomy
Order: Gentianales
Family: Rubiaceae
Genus: Ixora
Species: Casei, chinensis, coccinea
Ixora is known by several common names, including flame of the woods, jungle geranium, and West Indian jasmine.
The latter name is widely used in Florida and parts of the Caribbean, though ixora is native to Asia. In parts of its native range, particularly Indonesia, it is often called soka or soka flower.
Unlike some flora which tolerate a variety of soil types, ixora has specific cultural requirements for successful cultivation.
How to Grow
For in-ground specimens, allow room to reach mature dimensions unimpeded and meet the following cultural requirements:
Climate
In its natural habitat, ixora endures heat, humidity, and monsoon rains followed by dry, windy conditions. This plant cannot tolerate temperatures below 50°F.
Shrubs in home landscapes with tropical type conditions fare best. In cooler regions, growers should plant in containers that can be brought inside during the winter.
Light
Most species and cultivated varieties thrive in full sun, though some will tolerate the dappled shade cast by a leafy tree canopy.
Improved shade tolerance is a feature of some of the newer offerings.
Soil
The ideal ground soil is organically rich loam with an acidic pH of 5.0 to 5.5. Conduct a soil test and amend alkaline soil with an acidifier like sulfur.
Avoid planting near pavements or masonry foundations that may leach calcium carbonate into neighboring earth, raising the pH.
When ixora is grown in unsuitable soil, such as the alkaline sand of South Florida, it is prone to nutrient deficiencies that can cause leaf anomalies, such as purple spotting and yellowing.
Water
Moisture requirements are moderate.
Monitor in-ground shrubs with a moisture meter, watering them regularly when the top few inches of soil are dry, to maintain consistent moisture without oversaturation.
Aim the hose at the ground around shrubs, rather than over the foliage, to minimize the risk of fungal infection on damp foliage.
Fertilizer
Applying a fertilizer for acid-loving plants to your ixora shrubs every two to three months during the growing season ensures that the soil pH is acidic and essential nutrients are available for lush foliage and abundant blooming.
Dr. Earth Acid Lovers fertilizer is a slow-release product with a 3-4-3 (NPK) ratio. It supports the optimal blooming and general health of plants that thrive in low pH conditions.
You can find Dr. Earth’s Acid Lovers fertilizer available from Amazon.
Container Cultivation
Smaller varieties grow well in containers two to four inches wider and deeper than the root mass. The potting medium should be acidic, moisture-retentive, and well-draining.
I use a product from Soil Sunrise that contains peat moss, pine bark mulch, pine needle mulch, sphagnum moss, and vermiculite to create an acid-rich, aerated, moisture-retentive, well-draining growing environment.
Soil Sunrise Acid Loving Plants Potting Mix is available from Soil Sunrise via Amazon.
Provide a location with full sun to partial shade. Use a moisture meter and water before the pot completely dries out.
In cooler regions, bring pots indoors for the winter. Place them in bright, indirect sunlight away from cold drafts.
Monitor water needs as above, and provide as much humidity as possible, either by using a humidifier or setting the pot in a moist area of the home, such as a laundry room.
Cultivars to Select
There are many Ixora species and cultivated varieties available to the home gardener. You may encounter I. casei, I. chinensis, and I. coccinea.
However, it is more likely that you will find shrubs labelled “Ixora,” with descriptive details about Zone suitability, shade tolerance, flower color, and dimensions.
Maui Yellow
One of the Maui series, I. coccinea Maui Yellow has sunny golden flowers.
Mature dimensions are four to six feet tall with a spread of three to four feet. Larger cultivars like Maui Yellow function well as privacy screens.
Nora Grant
I. coccinea ‘Nora Grant’ is suited to Zones 10 to 12 and is prized for its bright pink flowers.
Shrubs have a dense, compact growth habit. Mature dimensions are three to four feet tall with an equal spread. Its modest proportions are well-suited to hedging.
‘Nora Grant’ is available from Emerald Goddess Gardens via Amazon.
Shady Lady
I. coccinea ‘Shady Lady’ has white to pale pink blossoms. Unlike most, this cultivar performs well in moderate shade.
Mature dimensions are a petite two-and-a-half to three feet tall and wide, making it an excellent choice for shade gardens and patio pots.
‘Shady Lady’ is available from Emerald Goddess Gardens via Amazon.
Maintenance
Give ixora plants enough space to reach their mature size and they won’t need routine pruning.
Remove damaged or dead branches at their point of origin throughout the growing season as needed.
In late winter or early spring, you can selectively prune to shape bonsai specimens, reduce the bulk of container-grown shrubs, or keep informal hedges in check.
Take care not to remove more than one-third of the total growth at a time to avoid stress.
Avoid formal hedging and regular deep pruning. Both cause weak, twiggy growth, sparse foliage and flowers, and a reduced lifespan.
It’s better to grow a dwarf variety than to force a large specimen to fit a small space with hard cutting.
Other maintenance includes mulching in the spring and fall to retain moisture and regulate the soil temperature. The mulch should extend to the drip line or outer perimeter – make sure it doesn’t touch the stems.
And finally, as mentioned, bring pots indoors before temperatures dip to 50°F in Zones that freeze.
Propagation
To propagate ixora, you’ll need seed, a cutting, or a nursery starter plant.
From Seed
To grow Ixora from seed, collect the drupes when they ripen from red or purple to black.
Spread them in a single layer on paper or a mesh screen, and let them dry out of direct sunlight. When shriveled, remove the pulp and soak the seeds in water for 24 hours.
Prepare a seed tray by filling the cells three-quarters full with an acidic potting mix. Sow one seed per cell, planting it at a depth about twice its width.
Cover the tray with plastic wrap to hold in moisture and place it in bright, indirect light. Keep the medium evenly moist but not waterlogged.
When the seedlings sprout, remove the plastic cover. When they have two sets of true leaves, they’ll be ready to transplant.
From Cuttings
To propagate from cuttings, take softwood stems about six inches long in late spring or early summer.
Strip the lower leaves to expose two to three inches of bare stem with at least one leaf node.
Fill six-inch pots about three-quarters full with an acidic potting mix. Use a pencil to make a planting hole two to three inches deep.
Dip the cut end of the stem in rooting hormone so that the node is coated, then insert it gently into the hole. Firm the soil around the cutting and water thoroughly.
Set the pots in bright, indirect light and keep the medium consistently moist but not soggy. New leaf growth signals that the cutting has rooted and is ready for transplanting.
Transplanting
To transplant seedlings, rooted cuttings, or nursery starts outdoors, prepare a hole twice as wide as the container and equally deep.
If planting more than one, leave enough space for each to reach its mature size. For hedges, halve the recommended spacing to encourage dense growth.
Check how deeply the plant sits in its pot and match that depth in the ground, with the crown at or just above soil level. Remove the plant from its container, set it in place, and backfill.
Firm the soil around the roots, water thoroughly, and keep the ground evenly moist until the plant is established. Fertilizer is not necessary at planting time.
If you’re growing your ixora in a container, choose a vessel two to four inches wider and deeper than the root ball, with good drainage.
Fill it a third of the way with a well-draining, acidic, organically rich, moisture-retentive potting mix.
Unpot the plant and set it at the same depth as it was in the growing pot, keeping the crown at or just above the soil surface, and backfill with soil.
Water well, and continue watering whenever the top few inches of soil feel dry.
Pests and Disease
Ixora is not prone to pests or disease. However, the plants may suffer damage from common pests like aphids, mealybugs, and scale.
These sapsuckers feed on sap, disfiguring and discoloring foliage and causing wilting. Aphids and scale insects favor warm, dry conditions, while mealybugs prefer dampness and humidity.
Deter the pests with proper watering to avoid overly dry or wet conditions.
Use a firm spray of the hose to dislodge aphids and mealybugs.
Remove scale insects by moistening them with 70 percent isopropyl alcohol and scraping them off with your fingernail. Apply organic neem oil or an insecticidal soap to treat both.
Root-knot nematodes may feed on the roots of outdoor specimens. These microscopic soil roundworms favor earth low in organic matter. They cause root damage, growth anomalies, leaf yellowing, and leaf dropping.
Amend poor soil with ingredients like humus or well-rotted manure when planting.
Side-dress several times during the growing season with more applications to maintain a fertile environment.
Disease
Diseases you may encounter include Cercospora leaf spot and sooty mold fungi. Moist, humid environments favor spore germination.
Symptoms include tan leaf spots that shade to reddish-purple with yellow margins followed by leaf drop.
Snip off and discard affected foliage. You can use copper fungicide if the damage is significant.
As mentioned, slightly acidic, fertile loam is the best growing medium for ixora.
However, in alkaline conditions, such as near pavements and foundations, and in sand, the soil may lack certain nutrients causing symptoms that look like the plant is suffering from disease.
When iron and manganese are lacking, chlorophyll production is impaired, causing the foliage to become yellow or chlorotic.
Older leaves may develop reddish-purple spots when phosphorus and/or potassium is lacking, similar to those caused by Cercospora leaf spot.
The remedy for nutrient deficiencies begins with conducting a soil test. Follow the recommendations to improve soil fertility and lower the pH.
Amendments may include a fertilizer blend of sulfur for iron, manganese, and soil acidity; bone meal for phosphorus; and potash for potassium.
Sooty mold is caused by a fungus that grows in the honeydew excreted by aphids and scale insects.
Symptoms include a gray-black fuzzy coating on the foliage that impairs chlorophyll production. In advanced cases, wilting and leaf drop may occur.
Rinse the mold away with a spray bottle of water containing a few drops of mild dish detergent. Then follow with a plain water rinse.
Lush and Long-Lasting
With its cultural requirements met, pruning in moderation, and prompt attention to pests and pathogens, ixora provides years of long-lasting blooms and lush evergreen foliage.
Do you grow ixora? Where do you feature it in your outdoor living space? Please tell us about your shrubs in the comments section below.
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