Bells of Ireland vs Mazus Plant Comparison
Compare these two plants side by side — care needs, key differences, and which is right for your home.
Bells of Ireland
Moluccella laevis
Bells of Ireland is an annual flowering plant known for its tall spikes of vibrant green, bell-shaped calyces (modified leaves) that surround tiny, inconspicuous white flowers. It typically grows to a height of 2-3 feet. While it can be grown indoors, it's primarily an outdoor plant, often cultivated in gardens for its unique architectural form and long-lasting cut flowers. People grow it for its ornamental value, particularly in floral arrangements, where its bright green color adds a striking contrast.
Mazus
Mazus reptans
Mazus reptans is a low-growing, mat-forming perennial that typically reaches only a few inches in height. It spreads rapidly via creeping stems that root at the nodes. The plant features small, oval-shaped, toothed leaves that are typically green but can take on bronze hues in cooler weather. It produces small, trumpet-shaped flowers in shades of lavender, purple, or white, often with yellow markings in the throat. Primarily an outdoor plant, it is valued for its ability to quickly cover ground and suppress weeds in rock gardens, between stepping stones, and as a lawn substitute. While it can be attempted indoors, it requires very bright light and consistent moisture, making it challenging.
Quick Plant Comparison
| Feature | Bells of Ireland | Mazus |
|---|---|---|
| Light | Full sun to partial shade outdoors. Indoors, requires very bright, direct light for at least 6 hours daily. | Full sun to partial shade outdoors. Indoors, requires very bright, direct light for several hours daily. |
| Watering | Outdoors: 2-3 times per week, depending on weather. Indoors: Every 5-7 days, depending on light and humidity. | Every 2-5 days outdoors during the growing season, less frequently indoors (every 5-7 days) depending on light and temperature. |
| Humidity | 40-60% | 40-60% |
| Temperature | 15-24°C | 15-24°C |
| Care Level | Expert | Expert |
| Growth Rate | Fast | Fast |
| Max Height | Indoors: 0.6-1 meter (2-3 feet). Outdoors: 0.6-1 meter (2-3 feet) | 5-10 cm (indoors may be slightly taller if etiolated) |
| Pet Safety | ✅ Safe | ❌ Toxic To Pets |
| Soil | Well-draining potting mix or garden soil. A mix of potting soil, perlite, and vermiculite is suitable. | Well-draining soil, such as a mix of potting soil, sand, and perlite. |
| Beginner Friendly | ❌ No | ❌ No |
| Weekly Maintenance | 30 minutes weekly | 15 minutes weekly (mostly for watering and occasional pruning) |
🔬 Botanical Information — Comparing These Plants
Bells of Ireland
| Scientific Name | Moluccella laevis |
|---|---|
| Family | Lamiaceae (Mint family) |
| Native To | Western Asia (Turkey, Syria, Caucasus) |
| Also Known As | Bells of Ireland, Molucca Balm, Shellflower |
| Leaves | The leaves are light green, oval to rounded in shape, and have slightly toothed edges. They are arranged oppositely along the stem and are generally inconspicuous compared to the prominent calyces. |
| Flowers | The actual flowers are small, white, and relatively insignificant, hidden within the larger green calyces. Flowering typically occurs in summer. |
Mazus
| Scientific Name | Mazus reptans |
|---|---|
| Family | Phrymaceae |
| Native To | Himalayas to Japan |
| Also Known As | Creeping Mazus, Creeping Mazus Flower, Japanese Mazus |
| Leaves | Small, oval-shaped leaves with toothed margins. Typically green, but can develop bronze or reddish hues in cooler weather. Leaves are usually 1-2 cm long. |
| Flowers | Flowers are small, trumpet-shaped, and typically lavender, purple, or white, often with yellow markings in the throat. They bloom in spring and summer. Flowering indoors is rare and requires very bright light. |
📏 Size & Growth — Plant Comparison
Bells of Ireland
Mazus
🌱 Propagation — Comparing Plant Growth
Bells of Ireland
Methods: Seed
Difficulty: Moderate
Tips: Sow seeds indoors 6-8 weeks before the last frost or directly outdoors after the last frost. Seeds require light to germinate, so press them gently into the soil surface. Keep the soil consistently moist.
Mazus
Methods: Division, Seed, Stem cuttings
Difficulty: Easy
Tips: Divide established clumps in spring or fall. Stem cuttings root easily in water or moist soil. Sow seeds in spring after the last frost.
✨ Benefits & Features — Comparing Plant Value
Bells of Ireland
The most striking feature is the bright green, bell-shaped calyces that surround the tiny white flowers. These calyces persist long after the flowers have faded, providing extended ornamental value. It is not native to Ireland, despite its common name.
- ✓ Adds unique architectural interest to gardens and floral arrangements.
- ✓ Provides a vibrant green color that contrasts well with other flowers.
- ✓ Attracts pollinators like bees and butterflies.
- ✓ Symbolizes luck and good fortune.
- ✓ Can be dried and used in dried flower arrangements.
- 🐾 Pet Safe
Mazus
Mazus reptans is unique for its rapid spreading habit and tolerance of light foot traffic. Its small, trumpet-shaped flowers add a delicate touch to the landscape. It is also relatively low-maintenance once established.
- ✓ Suppresses weeds
- ✓ Provides ground cover
- ✓ Attracts pollinators
- ✓ Adds visual interest with flowers
- ✓ Tolerates light foot traffic
- ⚠️ Toxic to pets
📅 Maintenance Schedule — Plant Care Comparison
Bells of Ireland
Mazus
🌞 Light Requirements
Bells of Ireland
Full sun to partial shade outdoors. Indoors, requires very bright, direct light for at least 6 hours daily.
Low light tolerant: ❌ No
Mazus
Full sun to partial shade outdoors. Indoors, requires very bright, direct light for several hours daily.
Low light tolerant: ❌ No
💧 Watering Needs
Bells of Ireland
Outdoors: Water regularly, keeping the soil consistently moist but not waterlogged. Indoors: Water thoroughly when the top inch of soil feels dry. Overwatering can lead to root rot; underwatering will cause wilting and browning of the calyces.
Mazus
Water thoroughly when the top inch of soil feels dry. Avoid overwatering, which can lead to root rot. Ensure good drainage. Signs of underwatering include wilting leaves; overwatering includes yellowing leaves and soggy soil.
🌡️ Temperature & Humidity
Bells of Ireland
Temperature: 15-24°C
Humidity: 40-60%
Mazus
Temperature: 15-24°C
Humidity: 40-60%
🤔 Which Plant Is Right For You?
Bells of Ireland
Moluccella laevisExperienced gardeners who want a unique and striking addition to their cut flower arrangements.
✅ Choose This Plant If...
- You want a unique and striking addition to your garden or floral arrangements.
- You enjoy the challenge of growing plants that require specific conditions.
- You are looking for a plant with a strong architectural presence.
- You want to attract pollinators to your garden.
- You need a long-lasting cut flower with a vibrant green color.
❌ Skip This Plant If...
- You have limited sunlight indoors and cannot provide supplemental lighting.
- You are a beginner gardener looking for an easy-to-grow plant.
- You live in a very hot or humid climate, which can increase the risk of fungal diseases.
Mazus
Mazus reptansGardeners looking for a fast-spreading ground cover to suppress weeds and add color to rock gardens or between stepping stones.
✅ Choose This Plant If...
- You want a fast-spreading ground cover
- You need to fill in gaps between pavers or rocks
- You want to suppress weeds in your garden
- You appreciate small, delicate flowers
- You are looking for a plant that tolerates light foot traffic.
❌ Skip This Plant If...
- You have pets that might ingest it
- You don't have a very bright, sunny location indoors
- You don't want a plant that spreads aggressively.
🎯 Quick Verdict
⚡ Key Differences Between These Plants
Both plants have similar basic care requirements but differ in appearance and specific needs. Compare plants carefully to find the best fit for your space.
💡 Pro Tips For Comparing These Plants
Bells of Ireland Care Tips
Bells of Ireland are best suited for outdoor gardens. Growing them indoors is challenging due to their high light requirements. Supplemental lighting is almost always necessary. Consistent watering and well-draining soil are crucial to prevent root rot. Requires careful monitoring for pests and diseases.
- Start seeds indoors 6-8 weeks before the last frost for earlier blooms.
- Provide well-draining soil to prevent root rot.
- Water regularly, especially during hot and dry weather.
- Fertilize every 2-4 weeks during the growing season with a balanced liquid fertilizer.
- Pinch back young plants to encourage bushier growth.
Mazus Care Tips
Mazus reptans is primarily an outdoor ground cover. Indoor cultivation is challenging due to its high light requirements and tendency to spread aggressively. Requires consistent moisture and well-draining soil. Monitor for pests and diseases.
- Provide excellent drainage to prevent root rot.
- Water deeply but infrequently, allowing the soil to dry slightly between waterings.
- Fertilize monthly during the growing season with a balanced fertilizer.
- Prune regularly to control spread and maintain desired shape.
- Monitor for pests and diseases, and treat promptly.
⚠️ Common Problems & Solutions — Plant Care Comparison
Bells of Ireland
Mazus
❓ Frequently Asked Questions — Comparing These Plants
Bells of Ireland
What are the light requirements for Bells of Ireland?
Bells of Ireland crave sunlight. They need at least 6-8 hours of direct sunlight each day to produce vibrant green calyces and strong stems. Insufficient light can lead to leggy growth, pale coloring, and reduced blooming. When grown indoors, place them near a south-facing window where they can receive ample sunlight. If natural light is limited, supplement with grow lights. Rotate the plants regularly to ensure even light exposure on all sides. When starting seeds indoors, use grow lights to ensure healthy seedling development.
How do I care for Bells of Ireland?
Bells of Ireland require full sun, at least 6-8 hours daily, to thrive. Plant them in well-draining soil with a slightly acidic to neutral pH (6.0-7.0). Water regularly, keeping the soil consistently moist but not waterlogged, especially during hot weather. Fertilize every 2-3 weeks with a balanced liquid fertilizer during the growing season (spring and summer).
How do I propagate Bells of Ireland?
Bells of Ireland are typically propagated by seed.
Mazus
What are the light requirements for Mazus?
Mazus prefers partial shade, especially in warmer climates. Direct sunlight can scorch the leaves, particularly during the hottest part of the day. Morning sun and afternoon shade are ideal. In cooler climates, Mazus can tolerate more sun exposure. When grown indoors, place Mazus near an east- or north-facing window to provide bright, indirect light. Avoid south-facing windows unless you can provide shade during peak sunlight hours. Insufficient light can lead to leggy growth and reduced flowering. Observe your plant closely and adjust its position as needed to ensure it receives the optimal amount of light.
How do I care for Mazus?
Mazus thrives in partial shade to full sun, depending on the climate. In hotter regions, provide afternoon shade to prevent scorching. Water regularly, especially during dry spells, keeping the soil consistently moist but not waterlogged. Well-draining soil is crucial to prevent root rot. Fertilize in spring with a balanced, slow-release fertilizer to promote healthy growth and abundant blooms. Trim back any dead or damaged foliage to encourage new growth. Mazus is generally low-maintenance, but regular watering and occasional fertilization will keep it looking its best. Monitor for pests like slugs and snails, and treat as needed. Mulching around the base of the plant helps retain moisture and suppress weeds. Deadheading spent flowers can encourage continued blooming throughout the season.
How do I propagate Mazus?
Mazus can be easily propagated by division, stem cuttings, or seed. For division, carefully dig up an established clump in the spring or fall and divide it into smaller sections, ensuring each section has healthy roots and foliage. Replant the divisions in well-draining soil. To propagate from stem cuttings, take 4-6 inch cuttings from healthy stems in the spring or summer. Remove the lower leaves and dip the cut end in rooting hormone. Plant the cuttings in a well-draining potting mix and keep them moist until they root. Seeds can be sown indoors 6-8 weeks before the last frost or directly outdoors in the spring after the danger of frost has passed. Keep the soil consistently moist until germination occurs.
Last updated: May 2, 2026 — Plant care data reviewed and verified by our editorial team.