Arum vs Delphinium 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.
Delphinium
Delphinium spp.
Delphiniums are perennial herbaceous plants known for their tall, striking flower spikes. They typically grow outdoors and are prized for their vibrant blue, purple, pink, and white flowers. The plant has deeply lobed leaves and a robust stem that supports the flower spike. They are not suited for indoor growing due to their high light requirements and size. People grow them in gardens for their aesthetic appeal and to attract pollinators.
Quick Plant Comparison
| Feature | Arum | Delphinium |
|---|---|---|
| Light | Partial to full shade outdoors. Indoors, requires very bright, indirect light, ideally a north-facing window or under grow lights. | Full sun (at least 6 hours of direct sunlight per day) |
| Watering | Every 10-14 days during growing season, much less frequently during dormancy. | 2-3 times per week, depending on weather and soil drainage |
| Humidity | 40-60% | 40-60% |
| Temperature | 10-21°C | 15-24°C |
| Care Level | Expert | Expert |
| Growth Rate | Moderate | Moderate |
| Max Height | Indoors: 30-60 cm | Not typically grown indoors; outdoors: 0.6-1.8 meters |
| 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, fertile soil rich in organic matter |
| Beginner Friendly | ❌ No | ❌ No |
| Weekly Maintenance | 15 minutes weekly during growing season, 5 minutes during dormancy. | 30 minutes weekly (weeding, watering, deadheading) |
🔬 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. |
Delphinium
| Scientific Name | Delphinium spp. |
|---|---|
| Family | Ranunculaceae |
| Native To | Northern Hemisphere, including Europe, Asia, and North America |
| Also Known As | Larkspur, Delphinium |
| Leaves | The leaves are deeply lobed and palmate, with a coarse texture. They are typically medium to dark green in color and arranged alternately along the stem. |
| Flowers | Delphiniums rarely, if ever, flower indoors. Outdoors, they produce tall, dense spikes of flowers in shades of blue, purple, pink, and white. The flowers have a distinctive spurred shape. |
📏 Size & Growth — Plant Comparison
Arum
Delphinium
🌱 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.
Delphinium
Methods: Seed, Division, Stem cuttings
Difficulty: Moderate
Tips: Sow seeds in early spring or fall. Divide established plants in spring or fall. Take stem cuttings in late spring.
✨ 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
Delphinium
Delphiniums are known for their towering flower spikes, which can reach impressive heights. The intense blue color of some varieties is particularly striking and relatively rare in the plant world.
- ✓ Attracts pollinators to the garden
- ✓ Adds vibrant color and height to flower beds
- ✓ Provides cut flowers for arrangements
- ✓ Enhances the aesthetic appeal of outdoor spaces
- ✓ Can be used in traditional medicine (with caution and expert knowledge)
- ⚠️ Toxic to pets
📅 Maintenance Schedule — Plant Care Comparison
Arum
Delphinium
🌞 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
Delphinium
Full sun (at least 6 hours of direct sunlight per day)
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.
Delphinium
Water deeply when the top inch of soil feels dry. Avoid overhead watering to prevent fungal diseases. Overwatering can lead to root rot, indicated by yellowing leaves and a mushy stem. Underwatering results in wilting and dry, crispy leaves.
🌡️ Temperature & Humidity
Arum
Temperature: 10-21°C
Humidity: 40-60%
Delphinium
Temperature: 15-24°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.
Delphinium
Delphinium spp.Gardeners looking to add height and vibrant color to their flower beds.
✅ Choose This Plant If...
- You want a tall, dramatic flower for your garden.
- You want to attract pollinators to your yard.
- You have a sunny garden spot with well-draining soil.
- You enjoy the classic cottage garden aesthetic.
- You are an experienced gardener looking for a rewarding challenge.
❌ Skip This Plant If...
- You have limited sunlight in your home.
- You have pets or small children who might ingest the plant.
- You are a beginner gardener looking for an easy-to-grow plant.
🎯 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.
Delphinium Care Tips
Delphiniums are primarily outdoor plants and are very challenging to grow indoors due to their high light requirements and need for specific temperature and humidity conditions. They require full sun, well-draining soil, and regular fertilization. Indoor cultivation is not recommended.
- Provide support for tall flower spikes to prevent them from bending or breaking.
- Deadhead spent flowers regularly to encourage more blooms.
- Protect from slugs and snails, especially young plants.
- Ensure good drainage to prevent root rot.
- Apply a layer of mulch around the base of the plant to retain moisture and suppress weeds.
⚠️ Common Problems & Solutions — Plant Care Comparison
Arum
Delphinium
❓ 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).
Delphinium
What are the light requirements for Delphinium?
Delphiniums are sun-loving plants and require at least six hours of direct sunlight daily to flourish. Insufficient light can lead to weak stems, poor flowering, and increased susceptibility to diseases. In hotter climates, some afternoon shade can be beneficial to prevent scorching. When selecting a location, consider the sun’s path and ensure the plants receive ample morning sun. Delphiniums grown in partial shade may still survive, but their blooms will be significantly diminished. If growing indoors, supplement with grow lights to provide the necessary intensity and duration of light. Rotate the plant regularly to ensure even light exposure.
How do I care for Delphinium?
Delphiniums require specific care to thrive. Plant in well-draining soil enriched with organic matter. Full sun (at least 6 hours daily) is crucial for optimal blooming. Water deeply but infrequently, allowing the soil to dry slightly between waterings. Fertilize regularly during the growing season with a balanced fertilizer, switching to a high-phosphorus fertilizer as buds develop to promote abundant blooms. Stake tall varieties to prevent them from collapsing under the weight of their flowers or in windy conditions. Deadhead spent blooms to encourage reblooming. Protect from slugs and snails, which can damage young plants. Provide adequate air circulation to prevent fungal diseases. Mulch around the base of the plant to retain moisture and suppress weeds.
How do I propagate Delphinium?
Delphiniums can be propagated through division, stem cuttings, and seeds. Division involves separating mature clumps in early spring or fall. Carefully dig up the plant and divide the root ball into sections, ensuring each section has healthy roots and shoots. Stem cuttings can be taken in spring. Select healthy, non-flowering stems and cut them into 4-6 inch sections. 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. Seeds can be sown indoors in late winter or early spring. Sow seeds thinly in a seed starting mix and keep them moist and warm. Germination typically takes 2-3 weeks.
Last updated: April 27, 2026 — Plant care data reviewed and verified by our editorial team.