Calla vs Cobaea Plant Comparison
Compare these two plants side by side — care needs, key differences, and which is right for your home.
Calla
Zantedeschia aethiopica
Zantedeschia aethiopica, commonly known as Calla Lily, is a rhizomatous herbaceous perennial prized for its elegant, trumpet-shaped spathes (modified leaves) that surround a central spadix. While often called a lily, it is not a true lily. It grows from rhizomes, producing large, arrow-shaped, glossy green leaves. It is primarily an outdoor plant, thriving in moist conditions. People grow it for its striking flowers, often used in bouquets and floral arrangements. It can be grown indoors, but requires specific conditions to thrive and may not flower as readily as outdoors.
Cobaea
Cobaea scandens
Cobaea scandens is a vigorous, fast-growing perennial vine, often grown as an annual in temperate climates. It is characterized by its twining habit and ability to quickly cover structures. The vine features distinctive cup-shaped flowers with prominent saucers, initially greenish-white, maturing to a rich purple. It's primarily an outdoor plant, valued for its rapid growth and attractive flowers, making it ideal for covering fences, arbors, and trellises. Indoor cultivation is challenging due to its high light and space requirements.
Quick Plant Comparison
| Feature | Calla | Cobaea |
|---|---|---|
| Light | Bright, indirect light to full sun outdoors. Indoors, provide bright indirect light, ideally near an east- or west-facing window. | Full sun to partial shade outdoors. Requires at least 6 hours of direct sunlight daily. |
| Watering | Every 3-7 days during the growing season, less frequently in winter. | Every 2-5 days outdoors, depending on weather conditions. |
| Humidity | 40-60% | 40-60% |
| Temperature | 18-24°C | 18-27°C |
| Care Level | Moderate | Expert |
| Growth Rate | Moderate | Fast |
| Max Height | Indoors: 0.6-1 meter | Rarely flowers or reaches full size indoors; outdoors up to 9-12 meters |
| Pet Safety | ❌ Toxic To Pets | ❌ Toxic To Pets |
| Soil | Well-draining potting mix rich in organic matter. A mix of peat moss, perlite, and compost is suitable. | Well-draining, fertile soil. A mix of garden soil, compost, and perlite is suitable. |
| Beginner Friendly | With Caution | ❌ No |
| Weekly Maintenance | 10 minutes weekly | 30 minutes weekly during growing season. |
🔬 Botanical Information — Comparing These Plants
Calla
| Scientific Name | Zantedeschia aethiopica |
|---|---|
| Family | Araceae |
| Native To | South Africa |
| Also Known As | Calla Lily, Arum Lily, Trumpet Lily |
| Leaves | Large, arrow-shaped, glossy green leaves. The leaves can be up to 45 cm long and 25 cm wide. Some varieties have speckled or variegated leaves. |
| Flowers | Can flower indoors with proper care, but more reliably flowers outdoors. The 'flower' is a modified leaf called a spathe, which is typically white, but can also be pink, yellow, orange, or purple. The spadix, the yellow spike in the center, is where the true flowers are located. |
Cobaea
| Scientific Name | Cobaea scandens |
|---|---|
| Family | Polemoniaceae |
| Native To | Mexico |
| Also Known As | Cup-and-Saucer Vine, Cathedral Bells, Mexican Ivy |
| Leaves | The leaves are pinnately compound, with 3-5 oval-shaped leaflets. The leaflets are typically 5-10 cm long and have a smooth texture. They are a medium green color. The tendrils emerge from the leaf axils and are used for climbing. |
| Flowers | It rarely flowers indoors. Outdoors, the flowers are bell-shaped, about 5 cm across, and have a prominent saucer-like calyx. They start out greenish-white and mature to a deep purple color. The flowers have a sweet, slightly musky fragrance. |
📏 Size & Growth — Plant Comparison
Calla
Cobaea
🌱 Propagation — Comparing Plant Growth
Calla
Methods: Division, Seed
Difficulty: Moderate
Tips: Divide rhizomes in early spring before new growth begins. Ensure each division has at least one eye (bud). Plant divisions in well-draining soil and keep moist. Seed propagation is possible but slower.
Cobaea
Methods: Seed, Stem cuttings
Difficulty: Moderate
Tips: For seeds, scarify and soak them before planting. Stem cuttings should be taken in spring or summer and rooted in a well-draining medium.
✨ Benefits & Features — Comparing Plant Value
Calla
The Calla Lily is not a true lily, but a rhizomatous perennial with a unique spathe and spadix flower structure. Its elegant, trumpet-shaped flowers make it a popular choice for bouquets and floral arrangements. It requires a dormant period in winter to promote flowering in the following season.
- ✓ Aesthetically pleasing flowers.
- ✓ Can be used for cut flower arrangements.
- ✓ Adds a touch of elegance to any room.
- ✓ Can improve mood and reduce stress.
- ✓ Provides a sense of accomplishment through successful care.
- ⚠️ Toxic to pets
Cobaea
The cup-and-saucer shape of the flowers is quite distinctive and unusual. The flowers also change color as they mature, adding to their visual appeal. The rapid growth rate makes it a great choice for quickly covering a large area.
- ✓ Provides shade and privacy.
- ✓ Attracts pollinators like bees and hummingbirds.
- ✓ Adds vertical interest to the garden.
- ✓ Offers a visually appealing display of unique flowers.
- ✓ Can be used to create a natural screen or backdrop.
- ⚠️ Toxic to pets
📅 Maintenance Schedule — Plant Care Comparison
Calla
Cobaea
🌞 Light Requirements
Calla
Bright, indirect light to full sun outdoors. Indoors, provide bright indirect light, ideally near an east- or west-facing window.
Low light tolerant: ❌ No
Cobaea
Full sun to partial shade outdoors. Requires at least 6 hours of direct sunlight daily.
Low light tolerant: ❌ No
💧 Watering Needs
Calla
Keep the soil consistently moist, especially during the growing season. Water thoroughly when the top inch of soil feels dry. Reduce watering in the dormant period. Overwatering can lead to rhizome rot, indicated by yellowing leaves and a foul odor. Underwatering results in wilting and browning leaf tips.
Cobaea
Water deeply when the top inch of soil feels dry. Avoid overwatering, which can lead to root rot. In hot weather, more frequent watering may be necessary. Reduce watering in cooler months.
🌡️ Temperature & Humidity
Calla
Temperature: 18-24°C
Humidity: 40-60%
Cobaea
Temperature: 18-27°C
Humidity: 40-60%
🤔 Which Plant Is Right For You?
Calla
Zantedeschia aethiopicaExperienced plant enthusiasts seeking a flowering plant with elegant blooms, willing to provide specific care requirements.
✅ Choose This Plant If...
- You appreciate elegant, trumpet-shaped flowers.
- You can provide bright, indirect light and consistent moisture.
- You are willing to provide a dormant period in winter.
- You are experienced with plant care and can address potential problems.
- You want a plant that can be used for cut flower arrangements.
❌ Skip This Plant If...
- You have pets that may ingest the plant.
- You cannot provide bright light or consistent moisture.
- You are a beginner plant owner.
- You prefer low-maintenance plants.
Cobaea
Cobaea scandensGardeners with outdoor space looking for a fast-growing vine to cover structures.
✅ Choose This Plant If...
- You have a large outdoor space to cover quickly.
- You want a vine with unique and attractive flowers.
- You live in a warm climate where it can thrive year-round.
- You are experienced with managing fast-growing vines.
- You want to attract pollinators to your garden.
❌ Skip This Plant If...
- You have limited indoor space.
- You are a beginner gardener.
- You have pets that might ingest the plant.
- You live in a climate with harsh winters.
- You cannot provide full sun.
🎯 Quick Verdict
⚡ Key Differences Between These Plants
Calla is rated Moderate care level, while Cobaea is Expert.
Calla has moderate growth, while Cobaea grows fast.
💡 Pro Tips For Comparing These Plants
Calla Care Tips
Calla Lilies require bright light and consistent moisture. They can be grown indoors, but may not flower as readily as outdoors. Ensure good drainage to prevent rhizome rot. Toxicity to pets is a significant concern. Requires a dormant period in winter.
- Provide a dormant period in winter by reducing watering and keeping the plant in a cool location.
- Ensure good drainage to prevent rhizome rot.
- Fertilize regularly during the growing season to promote flowering.
- Monitor for pests and diseases and treat promptly.
- Provide bright, indirect light for optimal growth and flowering.
Cobaea Care Tips
Cobaea scandens is primarily an outdoor plant that requires full sun, regular watering, and support for climbing. Indoor cultivation is extremely difficult due to the plant's high light requirements and vigorous growth habit. Expect challenges with flowering and overall plant health indoors.
- Provide a sturdy support structure for the vine to climb.
- Water deeply and regularly, especially during hot weather.
- Fertilize every 2-4 weeks during the growing season.
- Prune regularly to control growth and shape.
- Monitor for pests and diseases and treat promptly.
⚠️ Common Problems & Solutions — Plant Care Comparison
Calla
Cobaea
❓ Frequently Asked Questions — Comparing These Plants
Calla
What are the light requirements for Calla?
Calla lilies thrive in bright, indirect light. Direct sunlight can scorch their leaves, so avoid placing them in south-facing windows without some form of shading. An east- or west-facing window is ideal, providing ample light without the intensity of direct sun. If you notice the leaves becoming pale or the plant failing to bloom, it may not be receiving enough light. In such cases, consider supplementing with artificial grow lights. During the darker winter months, supplemental lighting is particularly beneficial to maintain healthy growth and encourage future blooms. Ensure the light is diffused to prevent leaf burn. Regular rotation of the plant ensures all sides receive adequate light, preventing uneven growth.
How do I care for Calla?
Calla lilies require bright, indirect light for optimal growth and blooming. Water thoroughly when the top inch of soil feels dry, ensuring proper drainage to prevent root rot. During the growing season (spring and summer), fertilize every 2-4 weeks with a balanced liquid fertilizer diluted to half strength to encourage flowering. Reduce watering and fertilization during the dormant period in fall and winter. Maintain a humidity level of 50-60%. Repot annually in spring using well-draining potting mix. Remove spent flowers to encourage more blooms. Monitor for pests like aphids and spider mites, and treat promptly if detected. Provide support for taller varieties to prevent them from bending. Rotate the plant regularly to ensure even growth and prevent leaning towards the light source. Protect from frost and freezing temperatures.
How do I propagate Calla?
Calla lilies can be propagated by division, stem cuttings (though less common), and keiki (small plantlets that sometimes form on the plant).
Cobaea
What are the light requirements for Cobaea?
Cobaea scandens requires plenty of sunlight to thrive and produce abundant blooms. Ideally, it should receive at least 6 hours of direct sunlight each day. In hotter climates, some afternoon shade can prevent leaf scorch. If growing indoors, place it near a south-facing window where it can receive the most intense light. Insufficient light can lead to leggy growth, reduced flowering, and pale foliage. If natural light is limited, consider supplementing with grow lights. Rotate the plant regularly to ensure even light exposure on all sides. Provide adequate support structures so the plant can grow towards the light source.
How do I care for Cobaea?
Cobaea thrives in well-draining soil and requires regular watering, especially during the growing season. Provide a sturdy support structure like a trellis or fence for the vine to climb. Prune regularly to control its size and shape, encouraging bushier growth and more blooms. Fertilize every 2-3 weeks with a balanced liquid fertilizer during the spring and summer months. Ensure it receives ample sunlight, ideally at least 6 hours of direct sun per day. Protect from frost, as it’s not fully hardy in colder climates. Monitor for pests like aphids and spider mites, and treat promptly. Repot young plants annually in the spring to provide fresh soil and room for growth. A location with good air circulation is essential.
How do I propagate Cobaea?
Cobaea can be propagated easily through stem cuttings or layering. For stem cuttings, take a 4-6 inch cutting from a healthy stem in spring or summer. Remove the lower leaves and dip the cut end in rooting hormone. Plant the cutting in moist, well-draining potting mix. Cover with a plastic bag or humidity dome to maintain moisture. Keep in a warm, bright location until roots develop, usually within a few weeks. For layering, bend a long stem down to the ground and bury a section of it in the soil, leaving the tip exposed. Secure the stem with a rock or garden staple. Once roots have formed, sever the new plant from the parent plant and transplant it.
Last updated: April 26, 2026 — Plant care data reviewed and verified by our editorial team.