Growing Borage in Zone 9b
Zone 9b has warm winters and an extended growing season — excellent for heat-loving crops like Borage. Last frost: Mar 10. First frost: Nov 15.
Planting Calendar
Season: Mar 10 – Nov 15 (250 days)
When to Plant Borage in Zone 9b
Start Seeds Indoors: Feb 10
Start Borage seeds indoors around Feb 10 (4 weeks before last frost). Optimal germination temperature: 70°F. Germinates in 5–14 days.
Transplant Outdoors: Mar 10
Transplant Borage seedlings outdoors after Mar 10. Wait until soil temperature reaches 50°F. Space plants at 18/sqft. Harden off plants for a week before moving outside.
Harvest: May 4
First harvest approximately May 4 (~55 days from planting). Continue harvesting until first frost (Nov 15).
Companion Planting
Borage in Other Zones
1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13bFrequently Asked Questions
When should I plant Borage in Zone 9b?
Start Borage seeds indoors around Feb 10. Transplant outdoors after Mar 10. Expect first harvest around May 4.
What is the last frost date for Zone 9b?
The average last spring frost date for Zone 9b is Mar 10. The first fall frost averages Nov 15, giving a 250-day growing season.
Can I grow Borage in Zone 9b?
Yes. Borage needs 55 days to harvest. Zone 9b has a 250-day growing season, which is sufficient.
What is the best month to plant Borage in Zone 9b?
The best time to start Borage in Zone 9b is Feb. Begin seeds indoors around Feb 10, then transplant outdoors after the last frost date of Mar 10.
What companion plants grow well with Borage?
Good companion plants for Borage include Strawberries, Tomatoes, Squash, Cucumbers.
How long does Borage take to harvest?
Borage takes approximately 55 days from planting to harvest. In Zone 9b, expect your first harvest around May 4.
Plan Your Borage Garden
Track Borage from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
Start Free Borage Growing Guide