Boston Fern vs Delphinium Plant Comparison
Compare these two plants side by side — care needs, key differences, and which is right for your home.
Boston Fern
Nephrolepis exaltata
The Boston Fern is a classic houseplant known for its graceful, arching fronds. It's a terrestrial fern, naturally found in humid forests and swamps. Its lush green foliage creates a soft, textured appearance, making it a popular choice for adding a touch of nature to indoor spaces. People grow it for its aesthetic appeal, air-purifying qualities (though not definitively proven by NASA), and relatively easy care, provided its humidity needs are met. It is primarily an outdoor plant but can adapt to indoor conditions with proper care.
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 | Boston Fern | Delphinium |
|---|---|---|
| Light | Bright, indirect light. Avoid direct sunlight, which can scorch the fronds. | Full sun (at least 6 hours of direct sunlight per day) |
| Watering | Every 2-5 days, depending on humidity and light levels | 2-3 times per week, depending on weather and soil drainage |
| Humidity | 60-80% | 40-60% |
| Temperature | 18-24°C | 15-24°C |
| Care Level | Moderate | Expert |
| Growth Rate | Moderate | Moderate |
| Max Height | 0.3-1 meter (indoors) | Not typically grown indoors; outdoors: 0.6-1.8 meters |
| Pet Safety | ✅ Safe | ❌ Toxic To Pets |
| Soil | Well-draining potting mix rich in organic matter, such as peat moss or coco coir | Well-draining, fertile soil rich in organic matter |
| Beginner Friendly | With Caution | ❌ No |
| Weekly Maintenance | 10-15 minutes weekly | 30 minutes weekly (weeding, watering, deadheading) |
🔬 Botanical Information — Comparing These Plants
Boston Fern
| Scientific Name | Nephrolepis exaltata |
|---|---|
| Family | Nephrolepidaceae |
| Native To | Tropical regions worldwide, particularly the Americas |
| Also Known As | Boston Fern, Sword Fern |
| Leaves | The leaves, or fronds, are pinnately compound, meaning they are composed of many small leaflets (pinnae) arranged along a central stem. The pinnae are typically bright green, lance-shaped, and have slightly serrated edges. The texture is delicate and feathery. |
| Flowers | Boston Ferns do not flower indoors. They reproduce via spores, which are located on the underside of the fronds. |
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
Boston Fern
Delphinium
🌱 Propagation — Comparing Plant Growth
Boston Fern
Methods: Division, Spores
Difficulty: Moderate
Tips: Divide the plant at the root ball, ensuring each division has healthy fronds and roots. Propagating from spores is more challenging and requires a sterile environment.
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
Boston Fern
Boston Ferns are known for their long, arching fronds that create a cascading effect. They require higher humidity than many other common houseplants, making them a bit more challenging to care for indoors.
- ✓ Adds a touch of nature and elegance to indoor spaces.
- ✓ Creates a relaxing and calming atmosphere.
- ✓ Can help to improve indoor air quality (though not definitively proven).
- ✓ Provides a sense of accomplishment when successfully cared for.
- ✓ Offers a visually appealing texture and color contrast to other houseplants.
- 🌬️ NASA-verified air purifier
- 🐾 Pet Safe
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
Boston Fern
Delphinium
🌞 Light Requirements
Boston Fern
Bright, indirect light. Avoid direct sunlight, which can scorch the fronds.
Low light tolerant: ❌ No
Delphinium
Full sun (at least 6 hours of direct sunlight per day)
Low light tolerant: ❌ No
💧 Watering Needs
Boston Fern
Keep the soil consistently moist but not soggy. Water when the top inch of soil feels dry to the touch. Overwatering can lead to root rot, indicated by yellowing or browning fronds. Underwatering results in crispy, dry fronds.
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
Boston Fern
Temperature: 18-24°C
Humidity: 60-80%
Delphinium
Temperature: 15-24°C
Humidity: 40-60%
🤔 Which Plant Is Right For You?
Boston Fern
Nephrolepis exaltataIndividuals who can provide consistent moisture and high humidity, such as those with humidifiers or bathrooms with natural light.
✅ Choose This Plant If...
- You want a classic, elegant houseplant that adds a touch of greenery to your home.
- You are looking for a plant that is non-toxic to pets.
- You can provide the high humidity levels this plant needs to thrive.
- You have a bright, indirectly lit space where the fern can flourish.
- You enjoy the challenge of providing specific care requirements to keep a plant healthy.
❌ Skip This Plant If...
- You struggle to maintain consistent watering schedules.
- You live in a very dry climate and cannot provide adequate humidity.
- You don't have a location with bright, indirect light.
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
Boston Fern is rated Moderate care level, while Delphinium is Expert.
💡 Pro Tips For Comparing These Plants
Boston Fern Care Tips
Boston Ferns require consistent moisture and high humidity to thrive indoors. Maintaining adequate humidity is the biggest challenge. They are not drought-tolerant and will suffer in dry environments. Provide bright, indirect light and regular fertilization during the growing season.
- Mist the fronds regularly to increase humidity.
- Place the pot on a pebble tray filled with water.
- Use a humidifier to maintain consistent humidity levels.
- Water thoroughly, allowing excess water to drain away.
- Avoid placing the plant near drafts or heat sources.
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
Boston Fern
Delphinium
❓ Frequently Asked Questions — Comparing These Plants
Boston Fern
What are the light requirements for Boston Fern?
Boston Ferns prefer bright, indirect light. Direct sunlight can scorch the delicate fronds, causing them to turn brown and crispy. An east-facing window is ideal, providing gentle morning sunlight. A north-facing window can also work, but the plant may not grow as vigorously. If placing the fern near a south- or west-facing window, be sure to filter the light with a sheer curtain. Insufficient light can lead to leggy growth and pale fronds. Rotate the plant regularly to ensure even light exposure on all sides. Artificial grow lights can supplement natural light, especially during the darker winter months.
How do I care for Boston Fern?
Boston Ferns thrive in bright, indirect light and high humidity. Water consistently, keeping the soil evenly moist but not soggy. Check the soil moisture regularly and water when the top inch feels slightly dry. Mist the fronds frequently or place the plant on a pebble tray filled with water to increase humidity. Fertilize monthly during the growing season (spring and summer) with a diluted liquid fertilizer formulated for ferns. Avoid placing the plant in direct sunlight or near drafts, as these can cause the fronds to dry out and turn brown. Repot every 1-2 years in the spring, using a well-draining potting mix. Regularly remove any dead or yellowing fronds to encourage new growth and maintain the plant’s appearance. Monitor for pests such as spider mites and treat as needed.
How do I propagate Boston Fern?
Boston Ferns can be propagated by division or by spores. Division is the easier method. To divide, carefully remove the plant from its pot and gently separate the root ball into two or more sections, ensuring each section has healthy fronds and roots. Repot each section in fresh potting mix. Propagation by spores is more challenging. Collect spores from the underside of mature fronds and sow them on a moist, sterile potting mix. Cover with a clear plastic dome to maintain high humidity and keep in indirect light. Spores can take several weeks or months to germinate. Keep the soil consistently moist and provide adequate ventilation to prevent fungal growth.
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: May 5, 2026 — Plant care data reviewed and verified by our editorial team.