If you’re fascinated by rare orchids, you’ve likely heard whispers of one particularly special species. The Edithcolea grandis is a succulent plant that stands out for its striking, star-shaped flowers and its elusive nature in cultivation.
Often called the Persian Carpet Flower or the Starfish Flower, it’s not technically an orchid, but it’s frequently grouped with them due to its exotic appearance. This plant is a true prize for collectors who appreciate the unusual. It offers a unique challenge and a spectacular reward for those who understand its needs.
Finding reliable information on its care can be tough. This guide provides clear, practical advice to help you succeed with this remarkable plant.
Edithcolea Grandis
This plant belongs to the Apocynaceae family, specifically the Stapeliad group, which includes other carrion flowers. It’s native to dry regions in East Africa and the Arabian Peninsula. Here’s what makes it so distinctive:
- Flowers: Large, flat, and five-pointed stars, up to 5 inches across. They are yellow with intricate red-brown markings, resembling an ornate carpet.
- Scent: Emits a strong odor of rotting meat to attract its primary pollinators, flies. It’s not a plant for a confined indoor space!
- Stems: Succulent, four-angled, toothed stems that are green to reddish. They form low, creeping clumps.
- Growth Habit: A slow-growing perennial that spreads outward rather than growing tall.
Understanding Its Natural Habitat
To care for Edithcolea grandis, you must think like it’s still in its native home. It thrives in harsh, arid environments with specific conditions.
It experiences intense sunlight, but often with some relief from rocks or other vegetation. Rainfall is infrequent and followed by rapid drying. The soil is extremely gritty and free-draining, with little organic matter. Temperatures are warm to hot, with cooler nights.
Mimicking these conditions in your home or greenhouse is the key to keeping it healthy and encouraging it to bloom.
Essential Care Requirements
Getting the basics right is non-negotiable with this plant. Stray too far from its preferences, and it will quickly decline.
Light and Temperature
Edithcolea grandis needs plenty of bright light. Provide at least 4-6 hours of direct sunlight daily, preferably morning sun. In very hot climates, some afternoon shade prevents scorching.
It prefers warm temperatures between 70°F and 85°F (21°C-29°C) during the growing season. In winter, a cooler period (50°F-60°F / 10°C-15°C) is beneficial for rest. Protect it from frost at all costs; it is not cold-hardy.
Watering and Humidity
This is where most failures occur. The golden rule is: when in doubt, don’t water.
- Growing Season (Spring-Fall): Water thoroughly only when the soil is completely dry. Soak the pot, then let all excess water drain away.
- Winter Rest: Watering should be drastically reduced. A light sprinkle once a month, or even less, is often enough to prevent stems from shriveling.
- Humidity: It prefers low humidity. Good air circulation is crucial to prevent fungal rot, especially when watering.
Soil and Potting
The perfect soil mix drains in seconds. A standard cactus mix is not enough; you need to amend it further.
A good recipe is:
- 2 parts cactus & succulent potting mix.
- 1 part perlite.
- 1 part coarse sand or poultry grit.
- A handful of small pumice or lava rock.
Always use a pot with a large drainage hole. Terracotta pots are excellent because they breathe and help soil dry faster. Repot only when absolutely necessary, as the plant dislikes root disturbance.
Propagation Methods
You can propagate Edithcolea grandis, but patience is required. The two main methods are stem cuttings and seeds.
From Stem Cuttings
This is the more reliable and faster method for home growers.
- Select a healthy, plump stem segment. Using a sterile knife, make a clean cut.
- Let the cutting dry (callus) in a shady, airy spot for 5-7 days. This is vital to prevent rot.
- Prepare a small pot with your gritty soil mix. Place the callused cutting on top of the soil; you can support it with some pebbles.
- Do not water. Place in bright, indirect light.
- After about 2-3 weeks, very lightly mist the soil surface. Only begin gentle watering when you see new growth, which can take several weeks.
From Seeds
Growing from seeds is a slow process and requires fresh seeds for good germination.
- Sow seeds on the surface of a moist, gritty seed-starting mix.
- Cover the pot with a clear lid or plastic wrap to maintain humidity.
- Place in a warm spot with bright, indirect light.
- Seeds may germinate in a few weeks. Once seedlings appear, gradually increase ventilation to remove the cover.
- Water seedlings from below with great care, keeping them slightly more moist than mature plants but never soggy.
Common Problems and Solutions
Even with perfect care, you might encounter issues. Here’s how to troubleshoot.
Stems Becoming Wrinkled or Shriveled
This is usually a sign of underwatering during the active growth season. Give the plant a thorough soak. If the stems are mushy, it’s likely rot from overwatering—a much more serious problem.
Stems Rotting at the Base
This is the most common killer: overwatering or poor-draining soil. Act fast.
- Cut away all soft, rotten tissue with a sterile tool until you see only healthy, firm stem.
- Let the saved portion callus for a week.
- Re-root it as a cutting in fresh, dry, gritty mix.
Lack of Flowers
If your plant is healthy but won’t bloom, check these factors:
- Age: The plant needs to be mature enough, often 3-5 years from seed.
- Light: It may not be getting enough direct sun.
- Winter Rest: A cooler, drier winter period is often the essential trigger for blooming the following season.
Pests
Mealybugs are the main pest, hiding in the stem ridges. Treat with a cotton swab dipped in rubbing alcohol. Scale insects can also appear. Good air flow helps prevent infestations.
Frequently Asked Questions (FAQ)
Is Edithcolea grandis actually an orchid?
No, it is a succulent in the Stapeliad group (Apocynaceae family). It’s commonly associated with orchids due to its exotic, intricate flowers.
Why does my Edithcolea smell so bad?
The foul odor is a natural adaptation to attract fly pollinators. It’s strongest in bright light when the flower is mature. Consider placing it in a well-ventilated area outdoors when in bloom.
How often should I fertilize my Persian Carpet Flower?
Fertilize sparingly. Use a diluted, balanced cactus fertilizer once a month during the active growing season (spring and summer). Do not fertilize in autumn and winter.
Can I grow Edithcolea grandis indoors?
Yes, but it requires a very sunny south-facing window. A grow light is often recommended to provide sufficient intensity, especially in winter. Ensure excellent air circulation around the plant.
What’s the difference between Edithcolea and Stapelia?
They are closely related genera. Edithcolea grandis is the only species in its genus and is known for its large, flat, intricately patterned star-shaped flowers. Stapelia flowers are often more deeply cup-shaped and vary more in size and hairiness.
My plant’s stems are stretching and looking pale. What’s wrong?
This is called etiolation. It means the plant is not recieving enough light and is stretching to find more. Gradually move it to a brighter location to prevent further weak growth.
Final Tips for Success
Cultivating Edithcolea grandis is a test of restraint and observation. It rewards neglectful watering more than attentive fussing. The biggest mistake you can make is treating it like a typical houseplant.
Focus on providing maximum light, a gritty soil that doesn’t hold moisture, and a strict seasonal watering rhythm. When it finally produces its astonishing, otherworldly bloom, the effort and patience will feel entirely worth it. Remember, its rarity in cultivation is a testament to its specific needs, not it’s impossibility to grow. With the right approach, you can enjoy this living piece of botanical art for many years.