How to Grow California Bluebells
Phacelia campanularia
When to Start
Direct sow outdoors as soon as soil reaches 8°C — typically early to mid spring. Hardy enough to tolerate light frosts.
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Growth Stages
Approximate days from start
Care Essentials
- Rarely needs feeding. A light application of balanced fertilizer at sowing is sufficient. Overfeeding produces foliage at the expense of flowers.
- California Bluebells thrive on neglect. They prefer poor, sandy soil and minimal watering once established. Direct sow where they are to grow as they resent transplanting.
Companion Planting
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Growing Conditions
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- Direct sow
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Spacing & Planting
| Plant spacing | 15 cm |
| Row spacing | 25 cm |
| Mature height | 35 cm |
| Mature spread | 25 cm |
Care Guide
- Feeding
- Rarely needs feeding. A light application of balanced fertilizer at sowing is sufficient. Overfeeding produces foliage at the expense of flowers.
- Watch for
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- Aphids
- Powdery mildew
Pests & Diseases
Pest Aphids
Identification: Clusters of small green or black insects on shoot tips and flower buds, causing distorted growth and sticky honeydew
- Blast off with a strong jet of water
- Spray with insecticidal soap or fatty acid solution
- Encourage natural predators such as ladybirds and lacewings
- Spray with a contact insecticide containing pyrethrin
Disease Powdery Mildew
Symptoms: White powdery coating on leaves and stems, especially in warm dry weather with cool nights
Treatment: Remove badly affected leaves. Improve air circulation by thinning overcrowded plants
Prevention: Space plants well for good airflow, water at soil level, avoid overhead watering
Growing Conditions
| Min. soil temperature | 8°C |
| Base growth temperature | 5°C |
| Photoperiod sensitivity | day neutral |
Frequently Asked Questions
- How far apart should I plant California Bluebells?
- Plant California Bluebells 15cm apart with 25cm between rows.
- Is California Bluebells frost hardy?
- California Bluebells is classified as Hardy.
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