California Bluebell
California Bluebell is a cover crop in the Boraginaceae family. It grows best in full sun with dry moisture, and is listed for USDA zones 3-10. Plants reach maturity about 51–92 days after planting and sit about 3 inches apart.
Varieties
2 from Seeds Now & True Leaf Market · sorted by days to maturity▸California Bluebell/Desert Bluebell51–69 days
California bluebell (Phacelia campanularia) is a compact desert annual with vivid cobalt-blue, bell-shaped flowers. Sow it in full sun and sharply drained soil. It handles dry conditions once established and is best suited to cool-season bloom in mild-winter climates or spring bloom elsewhere.
View on Seeds Now ↗▸California Bluebell68–92 days
Non-GMO; Container; Annual
80 Days to maturity. Phacelia campanularia. Phacelia California Bluebell Seeds. Non-GMO, annual. California Bluebell phacelia seeds grow a classic, summer-hardy, and authentic touch of the untamed California desert in your home or garden. California Bluebell phacelia is easy to grow from seed and a vigorous full sun wildflower, yet still elegant enough for any fresh-cut basket or bouquet. California Bluebell seeds promise durable 12-24 inches tall phacelia bursting with gorgeous 2 inch bell-shaped royal blue and cobalt blooms. California Bluebell phacelia seeds are native to California's Mojave and Sonoran deserts and are heat and drought-tolerant, an ideal crop for many hot and thirsty gardens across the southwest.
View on True Leaf Market ↗
Plant spacing
In a square-foot bed, space california bluebell about 3 in apart — that fits 16 plants in each 1-foot square (4×4). Wider rows or containers space the same.
Plan your california bluebell planting
Add california bluebell to a free GardenDraft plan and get sow, transplant, and harvest dates computed for your ZIP code — with a drag-and-drop bed layout and reminders when it’s time to plant.
Start your free plan →At a glance
Growing timeline
Care & troubleshooting— extension-sourced, with citations
When to feed, prune & water
Attract beneficial insects and protect pollinators
Protection- Routine carePlant insectary flowers and tolerate light pestsstrong evidence — extension confidence
Grow a diversity of flowering plants (including small-flowered umbels and asters) to feed predators and parasitoids, and tolerate low pest numbers so natural enemies have prey to stick around.
- Routine careNever spray open bloomsstrong evidence — extension confidence
Avoid insecticides on flowering plants and apply any needed sprays in the evening when pollinators aren't active, and favor selective products over broad-spectrum ones to spare bees and beneficials.
Something looks wrong?
Describe what you see on your california bluebelland we'll rank the likely causes — most likely first, least-invasive fix first.
Powdery mildew
Diseasemoderate- CulturalImprove airflow + remove worst leavesstrong evidence — extension confidence
Cut out the most heavily coated leaves and thin for airflow; avoid wetting foliage late in the day.
- OrganicPotassium-bicarbonate or sulfur - label use only· every 1 wk · ~4 wksmoderate evidence — extension confidence
Apply a labeled potassium-bicarbonate or sulfur fungicide weekly per the label. No sulfur within 2 weeks of oil or in high heat.
Aphids
Pestlow- CulturalBlast off with water· every 3 days · ~2 wksstrong evidence — extension confidence
Knock colonies off with a strong jet of water in the morning; repeat every few days. Light infestations rarely need more.
- OrganicInsecticidal soap - label use only· every 1 wk · ~3 wksmoderate evidence — extension confidence
For persistent colonies apply insecticidal soap to undersides per label. Avoid open flowers.