Cuphea carthagenensis — a medium houseplant, prefers full sun light
SPECIMEN · FROM THE LIBRARY
Cuphea carthagenensis

Cuphea Carthagenensis

Updated · 41 observations
ON THIS PLANT
A note from PlantMom

Colombian waxweed is fairly resistant to disease and is typically not prone to illnesses. Nevertheless, it can be affected by pests and diseases found in its surroundings. Such problems are generally mild. Regarding care, this plant requires moderate maintenance. It should be pruned regularly to maintain a neat appearance and promote healthy growth. Fertilizing can also help encourage flowering. Colombian waxweed is suitable for anyone who has outdoor space, like a garden or patio, and does not demand extensive gardening experience. It may need more attention when grown indoors.

— PlantMom
CARE GUIDE

How to keep Cuphea Carthagenensis.

Light

Colombian waxweed grows best when it consistently receives plentiful sunlight, though it can tolerate moderate light levels. Native to very sunny habitats, it needs strong light to reach its full potential but can also survive in dimmer conditions. Too little or too much light can negatively impact its health and growth.

Temperature

Colombian waxweed comes from habitats where temperatures typically range from 68 to 100 °F (20 to 38 ℃). It favors warm climates with seasonal shifts in temperature. In colder months, consider increasing the ambient temperature to replicate its natural environment.

Fertilizer

Once a Colombian waxweed has opened most of its blooms to full size, resume fertilizing. Around the period when blooms are at their peak, fertilize every three to four weeks, as weather allows. Then, when the plant begins producing fewer new blooms, stop fertilizing; there’s no need to feed it once it can’t produce more blooms.

Pruning

The Colombian waxweed is known for its vibrant tubular flowers and bushy appearance. It thrives particularly well when selectively pruned between early and late spring. By removing spent flowers and leggy growth, you can improve air circulation and sunlight exposure, which encourages bushier growth and prevents overgrowth. For optimal results, be sure to consult reliable sources for care instructions tailored to your specific climate.

CHARACTERISTICS

Botanical profile.

Plant Type
Herb
Life Cycle
Annual, Perennial
Genus
Cuphea
Family
Lythraceae
Hardiness Zone
9-11
Mature Height
10 cm to 61 cm
Mature Spread
20 cm to 40 cm
Leaf Color
Forest Green
Leaf Type
Semi-evergreen
Flower Color
Purple
Flower Size
0.51 cm to 0.76 cm
Bloom Time
Late spring, Summer, Fall
Planting Time
Spring
Harvest Time
Summer, Fall, Early winter
Native Area
Colombia, Belize, Honduras, Mexico, Guatemala, Bolivia, Venezuela, Peru, Brazil, Nicaragua, Ecuador, Costa Rica, Panama
ALSO KNOWN AS

Other names.

en Colombian Waxweed en Columbian cuphea en Tarweed en Tarweed cuphea
FREQUENTLY ASKED

Reader questions.

How should I water my Colombian waxweed for optimal growth?

There are multiple ways to water Colombian waxweed, including using a garden hose with a spray nozzle, a watering can, or any common watering tool. This plant is not too specific about its water source, as it can thrive on rainwater, tap water, or filtered water. However, it is best to avoid watering from overhead to prevent damage to leaves and flowers, as well as potential disease. Setting up a drip irrigation system is often the most effective way to water this plant, as it provides even and direct water distribution to the soil. If you have a Colombian waxweed in a container, you can follow a similar watering approach but using a cup, watering can, or tap to water the soil directly.

How many hours of sunlight do Colombian waxweed need each day to grow well?

To ensure optimal growth and survival, it is important to give the plants a minimum of 6 to 8 hours of sunlight each day. In particular, they benefit from morning light, especially during the summer. The Colombian waxweed species specifically thrives in full sun and benefits greatly from increased sunlight. Providing ample light allows these plants to produce more food, showcase stunning blooms, and thrive in their environment.

What temperature is best for Colombian waxweed?

To help your tropical plants thrive, it's best to maintain a temperature range of 75℉ to 90℉ (25-32℃). While different species can tolerate temperatures outside this range, sticking within a few degrees of these limits will ensure optimal growth. However, there are extreme temperature limits to be aware of. Anything below 50℉ (10℃) or above 95℉ (35℃) can hinder growth and cause issues with the leaves and stems. Low temperatures are particularly damaging, as even a light frost can lead to the death of your tropical plants. In fact, cellular death can occur rapidly, with some species dying within 12 to 24 hours.

What should I do if I give my Colombian waxweed too much water or too little water?

To help underwatered Colombian waxweed, simply water it more regularly. Overwatering, on the other hand, can be a bigger problem. It can cause diseases and even lead to the plant's decline and death. To prevent this, choose a sunny location with good drainage. If you overwater a potted Colombian waxweed, consider changing the pot to one with better drainage. When repotting, use loose soil and a pot that drains efficiently.

What kind of sunlight does Colombian waxweed need?

The Colombian waxweed thrives when grown in full sunlight. To ensure each plant receives equal sun exposure, avoid crowding them together. It is important not to deprive the leaves of sunlight. If you choose to plant them in pots, place the herbaceous flowers in windows that receive direct sun. Whether it is summer or winter, make sure they receive full sunlight throughout the year. These plants do not perform well in areas with partial or filtered light, as this can result in weak stems and unhealthy flowers. For optimal growth, it is recommended to always expose the Colombian waxweed to sunlight.

Does Colombian waxweed need different temperatures at different stages of growth?

Colombian waxweed growth is not reliant on temperature changes, but consistency is crucial. Even slight temperature fluctuations can slow down its growth at any stage, so it's important to keep it in a controlled environment. The optimal temperature range for its growth is between 75℉ and 90℉ (25-32℃), and it's especially important to maintain a temperature above the lower limit. While temperatures exceeding 90℉ (32℃) are not ideal, this tropical plant can tolerate it to some extent. However, temperatures below 50℉ (10℃), and particularly below 40℉ (5℃), can directly harm this heat-loving plant.

How frequently do I need to water my Colombian waxweed?

Colombian waxweed requires regular watering during its growing season. From spring onwards, it is recommended to water the plant once a week. As the season progresses and temperatures rise, you may need to increase the watering frequency to two or three times per week. However, be cautious not to exceed this rate as it can harm the Colombian waxweed. It is important to maintain the soil moisture at a relatively moist but not overly wet level, regardless of how often you need to water. When watering Colombian waxweed in a pot, it is advisable to water more frequently compared to plants planted in the ground. This is because the soil in pots tends to heat up and dry out faster. In most cases, watering a potted Colombian waxweed a few times per week is recommended, whereas an in-ground plant only requires once-weekly watering.

Is sunlight bad for plants? How do I protect Colombian waxweed from damage caused by sun and heat?

When the temperature rises above 90℉(32℃), the Colombian waxweed can be damaged by extreme temperatures. This is especially true if they are exposed to many hours of sun. In the summer, it's always best to provide some shade in the afternoon to protect them. Remember that sunlight in the summer is stronger and lasts 50% longer than in winter. If the Colombian waxweed gets too much sunlight, make sure to keep them well hydrated. Water them when the top of the soil is about 2 inches dry, and consider moving them indoors if it's too hot outside. This is particularly important if they are planted in containers. During the day, it's normal for the plant leaves to wilt, but they should recover overnight. If you notice that the Colombian waxweed is still drooping, it means the plant is losing water quickly and needs to be watered.

Does Colombian waxweed require different temperatures depending on the season?

Colombian waxweed is a low-maintenance plant, as it doesn't require different temperatures for different growing seasons. To ensure its optimal growth, the most important step in caring for it is to maintain the temperature within a specific range. It is recommended to keep this plant indoors so that you have control over the temperature, regardless of the climate outside. Light is also crucial for tropical species like the Colombian waxweed. These plants prefer partial sunlight exposure, so it's important to provide them with dappled or filtered light. Bright but indirect light is the best option when growing this plant indoors, as too much direct sunlight can harm its leaves and limit its potential for growth.

How water does my Colombian waxweed need?

There are a few different ways to determine how much water to give your Colombian waxweed. Some gardeners prefer to gauge soil moisture by touching it and suggest watering until the top six inches are moist. Another option is to use a specific measurement, such as around two gallons per week, depending on heat and dryness. However, following this strictly may overwater the plant if it needs less. When growing Colombian waxweed in a container, you'll need a different method. Generally, you should moisten all dry soil layers or check moisture by sticking a finger in the soil. Another indication is when excess water trickles out of the pot's drainage holes.

Should I make sure Colombian waxweed doesn't get too much sun?

The Colombian waxweed thrives in the sun, so it doesn't need any protection. It's even heliotropic, which means it is attracted to the sun. If possible, plant them in south-facing gardens so they can get morning to afternoon exposure. However, too much sun can lead to sunburn, so it might be helpful to provide shade in the afternoon and midday through a tree or wall. Growing them in shady areas won't work because they need a lot of energy to produce their larger flowers. Make sure to place them in an area with full sun to see the best results.

What temperatures are best for keeping your Colombian waxweed healthy?

Here are three tips to help you take care of your plants: 1. Keep your plants away from windows during colder months: Cold air can leak into your home through cracks in the windows, and any plants placed near them will be affected. Move tropical plants to an area with bright but indirect light, while avoiding potential drafts. 2. Watch out for dry patches, which may indicate too much sunlight or heat: If you notice white or scorched leaves, your plant may be getting too much heat or sunlight. This can lead to dehydration and hinder growth. Dry spots can spread and eventually cause your plants to die if left unaddressed. 3. Be cautious of frost: Colder temperatures and frost can damage plants by disrupting their water circulation. This can lead to a lack of moisture in the stems and leaves. Look out for signs of hydrosis (a water-soaked appearance) and if the issue persists, the plant may shrivel and turn dark brown or black, eventually leading to death.

PLATES
Cuphea carthagenensis leaf
PLATE 01 · leaf
Cuphea carthagenensis leaf
PLATE 02 · leaf
Cuphea carthagenensis flower
PLATE 03 · flower
Cuphea carthagenensis flower
PLATE 04 · flower
Cuphea carthagenensis habit
PLATE 05 · habit
Cuphea carthagenensis habit
PLATE 06 · habit
ALSO IN THE LIBRARY

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