Arum vs Night Phlox Plant Comparison
Compare these two plants side by side — care needs, key differences, and which is right for your home.
Arum
Arum italicum
Arum italicum is a tuberous herbaceous perennial known for its striking foliage and distinctive spadix and spathe flower structure. It emerges in the fall with arrow-shaped leaves, often beautifully veined in white or cream. The plant goes dormant in the summer. It is primarily an outdoor plant, thriving in woodland conditions. While it can be grown indoors, it requires very specific conditions to mimic its natural habitat. People grow it for its attractive foliage and unique flower structure.
Night Phlox
Zaluzianskya capensis
Zaluzianskya capensis, commonly known as Night Phlox, is a flowering perennial primarily grown as an annual in cooler climates. It's celebrated for its intensely fragrant blooms that release their sweet, vanilla-like scent in the evening and at night, attracting moths and other nocturnal pollinators. The plant features small, dark green, needle-like leaves and produces clusters of tiny, tubular flowers that are typically white on the inside and reddish-brown or purple on the outside. It grows to a height of about 30-60 cm (12-24 inches). Night Phlox is primarily an outdoor plant, favored for its unique fragrance and nighttime appeal in gardens and containers.
Quick Plant Comparison
| Feature | Arum | Night Phlox |
|---|---|---|
| Light | Partial to full shade outdoors. Indoors, requires very bright, indirect light, ideally a north-facing window or under grow lights. | Full sun to partial shade. Requires at least 6 hours of direct sunlight for optimal flowering. |
| Watering | Every 10-14 days during growing season, much less frequently during dormancy. | Every 2-3 days in hot weather, every 5-7 days in cooler weather, depending on soil dryness. |
| Humidity | 40-60% | 40-60% |
| Temperature | 10-21°C | 15-25°C |
| Care Level | Expert | Expert |
| Growth Rate | Moderate | Moderate |
| Max Height | Indoors: 30-60 cm | 30-60 cm (12-24 inches) |
| Pet Safety | ❌ Toxic To Pets | ❌ Toxic To Pets |
| Soil | Well-draining, humus-rich soil. A mix of potting soil, peat moss, and perlite is suitable. | Well-draining soil mix, such as a blend of potting soil, perlite, and compost. |
| Beginner Friendly | ❌ No | ❌ No |
| Weekly Maintenance | 15 minutes weekly during growing season, 5 minutes during dormancy. | 15 minutes weekly |
🔬 Botanical Information — Comparing These Plants
Arum
| Scientific Name | Arum italicum |
|---|---|
| Family | Araceae |
| Native To | Mediterranean region, from Portugal and Morocco to Turkey and Crimea |
| Also Known As | Italian Arum, Italian Lords-and-Ladies, Painted Arum |
| Leaves | The leaves are arrow-shaped, typically 20-30 cm long, and often feature prominent white or cream-colored veins. The texture is smooth and slightly waxy. |
| Flowers | Arum italicum produces a spadix and spathe flower structure. The spathe is a creamy-white or greenish-white hood-like structure that surrounds the spadix, a fleshy spike covered in tiny flowers. It rarely flowers indoors. |
Night Phlox
| Scientific Name | Zaluzianskya capensis |
|---|---|
| Family | Scrophulariaceae |
| Native To | South Africa |
| Also Known As | Night Phlox, Midnight Candy, Cape Phlox |
| Leaves | The leaves are small, narrow, and needle-like, typically dark green in color. They are arranged alternately along the stems. |
| Flowers | It can flower indoors if given enough light, but flowering is more prolific outdoors. The flowers are small, tubular, and clustered together. They are typically white on the inside and reddish-brown or purple on the outside. |
📏 Size & Growth — Plant Comparison
Arum
Night Phlox
🌱 Propagation — Comparing Plant Growth
Arum
Methods: Division of tubers, Seed
Difficulty: Moderate
Tips: Divide tubers in late summer or early fall. Sow seeds in the fall after the berries have ripened. Ensure good drainage when planting.
Night Phlox
Methods: Seed, Stem cuttings
Difficulty: Easy
Tips: For seeds, sow indoors 6-8 weeks before the last frost or directly outdoors after the danger of frost has passed. For stem cuttings, take 4-6 inch cuttings in spring or summer, remove lower leaves, and root in moist soil or water.
✨ Benefits & Features — Comparing Plant Value
Arum
Arum italicum is unique for its winter foliage, which appears after most plants have lost their leaves. Its distinctive spadix and spathe flower structure also set it apart from other plants.
- ✓ Unique and striking appearance.
- ✓ Adds visual interest to shady areas.
- ✓ Can be a conversation starter.
- ✓ Provides a touch of the Mediterranean landscape.
- ✓ Offers a seasonal display of foliage and berries.
- ⚠️ Toxic to pets
Night Phlox
Its most notable feature is its intense fragrance released at night. The flowers close during the day and open in the evening, making it a unique addition to a nighttime garden.
- ✓ Attracts nocturnal pollinators
- ✓ Adds fragrance to the garden
- ✓ Provides visual interest with its delicate flowers
- ✓ Can be grown in containers or garden beds
- ✓ Relatively easy to propagate from seed.
- ⚠️ Toxic to pets
📅 Maintenance Schedule — Plant Care Comparison
Arum
Night Phlox
🌞 Light Requirements
Arum
Partial to full shade outdoors. Indoors, requires very bright, indirect light, ideally a north-facing window or under grow lights.
Low light tolerant: ❌ No
Night Phlox
Full sun to partial shade. Requires at least 6 hours of direct sunlight for optimal flowering.
Low light tolerant: ❌ No
💧 Watering Needs
Arum
Water thoroughly when the top inch of soil is dry during the growing season (fall to spring). Reduce watering significantly during dormancy (summer). Overwatering can lead to tuber rot. Underwatering will cause the leaves to wilt and brown.
Night Phlox
Water regularly, especially during hot and dry periods. Keep the soil consistently moist but not waterlogged. Overwatering can lead to root rot, indicated by yellowing leaves and a musty smell. Underwatering results in wilting and dry, crispy leaves.
🌡️ Temperature & Humidity
Arum
Temperature: 10-21°C
Humidity: 40-60%
Night Phlox
Temperature: 15-25°C
Humidity: 40-60%
🤔 Which Plant Is Right For You?
Arum
Arum italicumExperienced gardeners who want a unique plant and can provide the specific conditions it needs.
✅ Choose This Plant If...
- You appreciate unique foliage and a striking plant structure.
- You can provide a cool, dormant period in the summer.
- You are an experienced gardener comfortable with challenging plants.
- You have a shady spot in your garden or can mimic those conditions indoors.
- You are prepared to handle a toxic plant and keep it away from pets and children.
❌ Skip This Plant If...
- You have pets or small children who might ingest the plant.
- You are a beginner gardener.
- You cannot provide a cool, dormant period.
- You don't have a bright, indirect light source.
- You prefer low-maintenance plants.
Night Phlox
Zaluzianskya capensisGardeners who enjoy fragrant nighttime blooms and attracting nocturnal pollinators.
✅ Choose This Plant If...
- You love fragrant gardens, especially at night.
- You want to attract moths and other nocturnal pollinators.
- You enjoy unique and unusual plants.
- You have a sunny garden or patio.
- You want a plant with beautiful, delicate flowers.
❌ Skip This Plant If...
- You have pets that might ingest the plant.
- You don't have a sunny outdoor space.
- You prefer plants that are easy to grow indoors.
🎯 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
Arum Care Tips
Arum italicum is primarily an outdoor plant and requires expert care to thrive indoors. It needs specific light, temperature, and dormancy conditions. It is toxic to pets. Indoor cultivation is challenging due to its seasonal growth cycle and need for a cool, dormant period.
- Provide a cool, dry dormant period in the summer by reducing watering significantly and keeping the plant in a cooler location.
- Ensure excellent drainage to prevent tuber rot.
- Fertilize regularly during the growing season with a balanced liquid fertilizer.
- Monitor for pests like aphids and spider mites and treat promptly.
- Wear gloves when handling the plant to avoid skin irritation from the sap.
Night Phlox Care Tips
Night Phlox is primarily an outdoor plant that thrives in full sun and well-draining soil. While it can be grown indoors, providing sufficient light and maintaining proper humidity levels can be challenging. It requires regular watering and fertilization during the growing season. Due to its need for intense sunlight, it's difficult to maintain indoors long-term.
- Provide well-draining soil to prevent root rot.
- Deadhead spent flowers regularly to encourage more blooms.
- Water deeply but infrequently, allowing the soil to dry slightly between waterings.
- Fertilize regularly during the growing season.
- Protect from frost in colder climates.
⚠️ Common Problems & Solutions — Plant Care Comparison
Arum
Night Phlox
❓ Frequently Asked Questions — Comparing These Plants
Arum
What are the light requirements for Arum?
Arum plants thrive best in bright, indirect light. Direct sunlight can scorch the leaves, so avoid placing them in areas with intense midday sun. An east-facing window is often ideal, providing gentle morning light. If you only have south or west-facing windows, filter the light with sheer curtains or blinds. Insufficient light can result in leggy growth and reduced flowering. Rotate the plant regularly to ensure even light exposure on all sides. During the darker months, consider supplementing with artificial grow lights to maintain healthy growth. Observe the plant’s foliage; if the leaves appear pale or stretched, it’s a sign that it needs more light.
How do I care for Arum?
Arum plants prefer bright, indirect light but can tolerate some shade. Water thoroughly when the top inch of soil feels dry to the touch, ensuring good drainage to prevent root rot. Fertilize monthly during the growing season (spring and summer) with a balanced liquid fertilizer diluted to half strength. Reduce watering and fertilization during the dormant period in fall and winter. Maintain moderate humidity, especially indoors. Repot every 1-2 years in spring, using a well-draining potting mix. Prune away any yellowing or dead leaves to encourage healthy growth. Protect from frost as Arum is not cold hardy. Monitor for pests such as aphids or spider mites and treat accordingly. Proper air circulation is essential to prevent fungal diseases.
How do I propagate Arum?
Arum can be propagated through division, stem cuttings, or from bulb offsets (keikis).
Night Phlox
What are the light requirements for Night Phlox?
Night Phlox thrives best in full sun, requiring at least 6 hours of direct sunlight per day. However, it can also tolerate partial shade, especially in hotter climates where intense afternoon sun can scorch the leaves. Insufficient light will result in fewer blooms and a weaker fragrance.
How do I care for Night Phlox?
Night Phlox thrives in well-draining soil and prefers full sun to partial shade. Water regularly, allowing the soil to dry slightly between waterings. Avoid overwatering, as this can lead to root rot. Fertilize every 2-4 weeks during the growing season (spring and summer) with a balanced liquid fertilizer to promote blooming.
How do I propagate Night Phlox?
Night Phlox is typically propagated by seed. Sow seeds indoors 6-8 weeks before the last frost. Keep soil moist and warm until germination. Transplant seedlings outdoors after the last frost.
Last updated: May 11, 2026 — Plant care data reviewed and verified by our editorial team.