How to Grow and Care for Coral Bead Plant

Nertera granadensis

Coral bead, Nertera granadensis is a low-profile ornamental evergreen with bright red-orange berries.

It’s suited to outdoor cultivation in USDA Hardiness Zones 9 to 11 and grows as an annual or houseplant in other regions.

Also known as coral moss, English baby tears, and pincushion plant, N. granadensis is a semitropical herbaceous, mat-forming perennial native to elevations at or above 8,000 feet in the western Pacific region.

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It reaches a mature height of two to four inches with a spread of eight to 10 inches. It spreads and naturalizes via self-seeding and root formation where the leaf nodes touch the ground.

The tiny leaves are rounded and green. Equally petite greenish-white blossoms precede a spectacular late spring to early summer display of glossy red-orange berries.

Read on to learn how to grow and care for coral bead in the garden and indoor and outdoor containers.

Here’s what we’ll cover:

The earliest history of the Nertera genus suggests that it was present in New Zealand and separated from a closely related genus, Coprosma, about 25 million years ago. Migrating birds subsequently carried the seeds to other western Pacific lands.

Today, about 15 species exist within the genus, which belongs to the Rubiaceae family, the same group that includes gardenia and lisianthus.

The best known is N. granadensis, appreciated for its vivid berries that seem almost unreal against the dense mat of foliage.

Indoors, the plant is often sold around spring holidays as a novelty gift, but it can be surprisingly finicky after the berries fade, requiring careful attention to watering and humidity to keep it thriving.

In its native habitat, coral bead thrives as a ground cover in high-altitude meadows and forest margins, where cool nights, bright but indirect light, and consistent moisture prevail.

Replicating these conditions indoors is the challenge, but when successful, the plant makes a conversation-starting centerpiece for tabletops, dish gardens, and terrariums.

If you cultivate outdoors as an annual or perennial, you’ll find coral bead to be an eye-catching ground cover and welcome addition to alpine gardens and rockeries where it readily naturalizes.

How to Grow

Coral bead plants are usually sold already in berry and are often treated as seasonal ornamentals that decline after the fruit fades.

Growing from seed or keeping the plants alive long enough to rebloom is considerably more difficult, as they require consistently cool temperatures and high humidity to set fruit again.

Coral bead plants thrive when you mimic their natural environment: cool, moist highlands with consistent humidity and dappled light.

Indoors, they’re considered finicky, but with the right care, you can keep them healthy long enough to enjoy their colorful berries.

Let’s take a look at the ideal growing conditions:

Light

Soil

Moist but well-draining soil is required. Use a peat- or coir-based potting mix amended with perlite or sand for containers.

In the garden, sandy loam enriched with organic matter works well. Aim for a slightly acidic to neutral pH of between 6.1 to 7.3.

Avoid compacted or heavy soils that hold excess water, which can quickly lead to root rot.

Temperature and Humidity

This plant performs best at temperatures between 55 to 65°F during active growth.

To encourage flowers and fruit, it needs several weeks exposed to temperatures of 50 to 59°F in spring.

While hardy in Zones 9 to 11, this species naturally grows at high elevations where summers remain mild.

In warmer lowland areas, coral bead plants often decline in hot weather unless given shade and consistent moisture. Indoors, keep them away from heat vents or drafts.

Coral bead can tolerate temperatures up to 80°F as long as the plant is well-hydrated and not exposed to direct sunlight.

Humidity should stay above 50 percent, so set pots on pebble trays or use a humidifier if necessary.

Water

Consistent moisture is essential. Water when the top inch of soil feels dry, and continue until water drains from the bottom of the pot.

Alternatively, you can place a pot in a dish filled with an inch of water and let it drink for 20 to 30 minutes. Whether you water over the soil or use the bottom-watering method, it’s crucial to avoid letting the soil completely dry out.

Never allow the soil to dry out completely, but avoid leaving roots in standing water. In fall and winter, reduce the frequency and allow the soil to dry slightly between waterings. You can use a moisture meter to guide you.

Outdoors, provide an inch of water per week in the absence of rain, and more as needed during high heat and dry spells.

Fertilizing

During active spring and summer growth, indoor and outdoor containers benefit from monthly applications of all-purpose liquid houseplant fertilizer diluted to half strength.

Do not fertilize in fall and winter. Overfertilizing produces excess foliage and discourages flowers.

I like to use Dr. Earth® Pump & Grow® Indoor House Plant Food, which has an NPK ratio of 1-1-1. This is a balanced liquid product suitable for indoor and outdoor containers.

Dr. Earth Pump and Grow

Dr. Earth® Pump & Grow® Indoor House Plant Food is available from Arbico Organics.

Outdoors, in early spring apply a slow-release, all-purpose, granular fertilizer sparingly, at no more than half the recommended dose, to support healthy foliage, flowers, fruits, and roots.

Where to Buy

In addition to straight species N. granadensis, there are naturally occurring variations, including N. granadensis var. insularis, N. granadensis var. javanica, and N. granadensis var. tetrasperma.

There are a few cultivated varieties with orange, red, white, yellow, or multicolored fruits. These are typically listed as the fruit color rather than as named cultivars.

Seeds and plants are not easy to find unless you are in the Western Pacific or a temperate region, like the United Kingdom.

Maintenance

If you have sprawling, healthy outdoor plants, there’s little maintenance needed.

You can prune wayward stems that creep out of your designated boundaries by snipping them just above a leaf node to redirect stems laterally.

In addition, to maintain an aesthetically pleasing display, you can pinch off berries that turn from plump red-orange to sticky, shriveled black.

Overcrowded in-ground plants benefit from dividing every few years to rejuvenate the clump and to inhibit fungal development.

If you grow coral bead as an annual, clear away and dispose of all foliage and berries at season’s end to inhibit the wintering-over of pests and pathogens.

Propagation

To start, you’ll need seeds, a tip cutting, division, or nursery start. Let’s consider each method.

From Seed

To start from seed, you’ll need to either purchase some or save them from ripe fruits.

1. In the spring, fill a seed starter tray with a quality seed-starting mix made from peat or coir blended with vermiculite and perlite.
2. Moisten the medium and sow two to three seeds per starter cell.
3. Cover the seeds with an eighth of an inch of potting medium.
4. Use clear plastic wrap or a humidity dome to cover the tray, to create a mini greenhouse.
5. Set the tray in a spot indoors that receives bright, indirect sunlight. Avoid direct sun.
6. Maintain a temperature of 65 to 75°F, using a heat mat if necessary.
7. Keep the soil evenly moist and vent the plastic for a short period of time every couple of days.
8. In three to four weeks, when you see sprouts, remove the plastic.
9. When the seedlings begin to leaf out, thin them to one per cell.

When three to four inches tall, transfer each seedling to its own individual three-inch pot filled with all-purpose potting medium.

Settle the starter cell contents into the soil so the lowest leaves sit at or slightly above the container rim.

There should be at least a quarter to a half inch of space between the soil surface and the pot rim to allow for watering without overflow.

Backfill and tamp down to hold the seedling in place.

Continue to maintain even moisture and provide bright, indirect sunlight.

From Tip Cuttings

Coral bead can also be propagated from stem tips in spring, when new growth is soft.

1. Fill a three-inch vessel with a drainage hole with all-purpose potting soil.
2. Use your scissors to cut a stem that is about two inches long from the tip. Cut just below a leaf node, a natural growing point that will quickly regenerate.
3. Snip off enough of the lower leaves to reveal a bare stem of about half an inch.
4. Dip the cut end of the stem into rooting hormone powder.
5. Make a half-inch-deep hole in the center of the soil.
6. Set the stem so the lowest leaves are at or just above the level of the container rim.
7. Tamp down around the cutting to hold it upright.
8. Water well.
9. Place the pot in bright, indirect sunlight.
10. Maintain even moisture without allowing the soil to become oversaturated.

When you see new foliage starting to grow, this indicates that the cutting has taken root.

By Division

To start by division, you’ll need an existing plant. It should be over a year old, with one or more substantial clumps of foliage.

1. In early spring, spread out newspaper or paper towels to work on.
2. Either unpot a container-grown specimen or use a small trowel to carefully dig up a coral bead clump from the garden.
3. Use your fingers to tease the roots apart, separating the individual stems gently.
4. Take one or more stems as desired. Make sure each section has roots attached.
5. Return the parent plant to its original container or garden.
6. Choose a vessel two inches wider and deeper than each division.
7. Fill it three-quarters full of potting soil and plant each division in its own individual pot, taking care not to damage the roots. Water well.

Set the pot(s) in a location with bright, indirect sun exposure.

Transplanting

If you have a seedling, rooted cutting, or division that you’d like to transplant to a more permanent location, set it at the same depth as it was growing in the original container. 

The lowest leaves should be at or slightly above the rim of a pot or in a garden setting, just above the soil surface.

Pests and Disease

Under less than ideal conditions, like those that are overly wet or dry, coral bead may be vulnerable to pests and fungal pathogens.

Pests

Some pests to be on the lookout for include aphids, mealybugs, scale, and spider mites.

These sapsuckers are most likely to be present in dry environments. Symptoms include leaf deformity, discoloration, and drop, as well as clusters or mounds of insects and trails of shiny, sticky secretions called “honeydew.”

Sooty mold fungus can develop on the areas where honeydew is present.

Remove affected foliage. Use a firm spray of water to dislodge the pests, followed by an application of neem oil.

Disease

Powdery mildew is a fungal condition that proliferates in dark, wet places. The telltale sign is a grayish-white, furry coating over the foliage.

Remove affected foliage and apply neem oil. Inhibit its formation by providing adequate sunlight and aiming the hose or watering can nozzle at the soil level to avoid wetting the leaves.

Root rot can occur when coral bead plants are overwatered and/or the drainage is insufficient. Various fungal pathogens and oomycetes can infect oversaturated roots.

Dainty But Demanding

Coral bead is quite at home in gardens in conditions that mimic its native high-elevation Pacific habitat.

You’re on the road to success when you provide sandy loam, moderate moisture, excellent drainage, and dappled sunlight.

For containers, using a moisture meter helps with monitoring water needs. Replenishing the potting soil regularly and fertilizing go a long way toward meeting cultural requirements.

Indoors, provide bright, indirect light, a pan of stones to promote a humid environment.

Do you grow coral bead plants? Please tell us about it in the comments below!

If you found this article informative and want to learn about more about growing houseplants, we recommend the following:

• 5 Houseplant Grooming and Maintenance Tips
• How to Acclimate Plants for Winter Indoors
• How to Propagate Houseplants from Stem and Leaf Cuttings