African-lily
Agapanthus praecoxUSDA | Grow Zone
8-11Outdoors all year in zones 8 to 11. Anywhere colder, keep it as a houseplant. Protect it below 20°F.
- Light
- Full sun to partial shade
- Water
- When top inch is dry
- Humidity
- Average to high
- Temperature
- 60-75°F (15-24°C)
- Difficulty
- Beginner
- Growth
- Moderate
- Mature size
- 3-4 ft tall, 2-3 ft wide
Agapanthus praecox, commonly known as the African-lily, is a stunning perennial native to South Africa. With its striking blue or white flowers, it adds beauty to gardens and landscapes, thriving in sunny locations.
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Ideal temperature
60-75°F is where it grows fastest. Below 20°F cold damage starts.
Spacing and harvest
- Mature size
- 3-4 ft tall, 2-3 ft wide
- Plant apart
- 12-24 in
- Frost
- Half hardy: light frost only
Everything it needs
9 essentials at a glance
Watering
Agapanthus praecox prefers consistently moist soil, especially during the growing season.
Water thoroughly when the top inch of soil feels dry, typically every 1-2 weeks. In the winter, reduce watering to once every 3-4 weeks. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and leaf drop.
Light
This plant thrives in full sun to partial shade, ideally receiving 6-8 hours of direct sunlight daily.
It can tolerate some afternoon shade, especially in hotter climates. Insufficient light may lead to leggy growth and fewer blooms.
Soil
Agapanthus prefers well-draining soil with a pH range of 6.0 to 7.0.
A mix of potting soil, sand, and perlite is recommended to ensure good drainage. Avoid heavy clay soils that retain water, as this can lead to root rot.
Humidity
Agapanthus does well in average humidity levels but can benefit from higher humidity during hot summer months.
To increase humidity, mist the leaves or place a humidifier nearby. Signs of low humidity include browning leaf tips and poor growth.
Temperature
The ideal temperature range for Agapanthus praecox is between 60-75°F (15-24°C).
It is hardy in zones 8-11, tolerating mild frost but not extreme cold. Protect from temperatures below 20°F (-6°C) to prevent damage.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 or similar during the growing season, applying every 4-6 weeks.
In fall, switch to a low-nitrogen fertilizer to encourage root development. Signs of nutrient deficiency include stunted growth and yellowing leaves.
Pruning
Prune Agapanthus after blooming to remove spent flowers and promote new growth.
Use clean, sharp pruning shears to cut back the stems to the base. This plant does not require heavy pruning, but removing dead or damaged leaves can improve appearance.
Repotting
Repot Agapanthus every 2-3 years or when it becomes root-bound, typically in spring.
Choose a pot 1-2 inches larger in diameter. Signs it needs repotting include roots growing out of the drainage holes and reduced flowering. To repot, gently remove the plant from its pot, loosen the roots, and place it in fresh soil.
Propagation
Agapanthus can be propagated through division or seeds.
For division, carefully dig up the plant in early spring, separating the clumps into sections with at least one growth point each. Replant immediately. For seed propagation, collect seeds in late summer and sow them in a seed tray with a light potting mix, keeping them moist until germination.
When it's unhappy
Yellow leaves
Why it happens
This can be caused by over-watering or nutrient deficiency.
How to fix it
Check soil moisture levels and adjust watering accordingly. Fertilize with a balanced fertilizer if nutrient deficiency is suspected.
Root rot
Why it happens
Root rot is often caused by overly wet soil and poor drainage.
How to fix it
Ensure the pot has adequate drainage holes and reduce watering frequency. If root rot is present, remove the plant from the pot, trim away affected roots, and repot in fresh soil.
Leggy growth
Why it happens
Insufficient light can lead to weak, stretched growth.
How to fix it
Move the plant to a brighter location where it can receive full sun for at least 6 hours a day.
Poor flowering
Why it happens
This may result from inadequate sunlight or nutrient deficiency.
How to fix it
Ensure the plant receives enough sunlight and consider fertilizing to promote blooming.
Browning leaf tips
Why it happens
This can be a sign of low humidity or over-fertilization.
How to fix it
Increase humidity around the plant and reduce fertilizer application if browning occurs.
Care through the year
Spring
In spring, repot if necessary and begin regular watering and fertilizing as new growth appears. This is also the best time to propagate by division.
Summer
During summer, ensure the plant receives full sun and adequate moisture. Monitor for pests and water regularly to support blooming.
Fall
In fall, reduce watering as the plant enters dormancy. Cut back spent flowers and consider applying a low-nitrogen fertilizer to promote root growth.
Winter
In winter, water sparingly and protect the plant from frost. If grown in pots, consider moving indoors or to a sheltered location.
Toxicity & Safety
Agapanthus is considered non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal upset. It's best to keep it out of reach of curious pets.
Good to know
How often should I water my Agapanthus?
Water your Agapanthus every 1-2 weeks, allowing the top inch of soil to dry out between waterings. Adjust frequency based on weather conditions.
Why are my Agapanthus leaves turning yellow?
Yellow leaves can indicate over-watering or nutrient deficiency. Check the soil moisture and consider fertilizing if necessary.
What is the best light for Agapanthus?
Agapanthus thrives in full sun, ideally receiving 6-8 hours of direct sunlight daily. It can tolerate some afternoon shade.
When should I prune my Agapanthus?
Prune Agapanthus after blooming to remove spent flowers and promote new growth. This helps maintain its appearance and health.
How do I propagate Agapanthus?
Agapanthus can be propagated by division in early spring or by seeds. For division, separate clumps and replant immediately.
What type of soil does Agapanthus need?
Agapanthus prefers well-draining soil with a pH of 6.0 to 7.0. A mix of potting soil, sand, and perlite is ideal.
Is Agapanthus toxic to pets?
Agapanthus is non-toxic to pets and children, but ingestion of large amounts may cause mild gastrointestinal upset.
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