Growing Watercress in Zone 12b
Zone 12b has a year-round growing season. Watercress can be planted almost any time with proper planning. Last frost: Jan 1. First frost: Dec 31.
Planting Calendar
Season: Jan 1 – Dec 31 (364 days) · Succession: plant every 2 weeks (up to 22x)
When to Plant Watercress in Zone 12b
Start Seeds Indoors: Nov 20
Start Watercress seeds indoors around Nov 20 (6 weeks before last frost). Optimal germination temperature: 60°F. Germinates in 7–14 days.
Transplant Outdoors: Dec 18
Transplant Watercress seedlings outdoors after Dec 18. Wait until soil temperature reaches 45°F. Space plants at 6/sqft. Harden off plants for a week before moving outside.
Harvest: Jan 22
First harvest approximately Jan 22 (~35 days from transplant). Continue harvesting until first frost (Dec 31). Watercress can overwinter in mild climates for continued harvest.
Fall Planting: Nov 19
For a fall harvest, plant Watercress around Nov 19 (6 weeks before first frost).
Watercress 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 Watercress in Zone 12b?
Start Watercress seeds indoors around Nov 20. Transplant outdoors after Dec 18. Expect first harvest around Jan 22.
What is the last frost date for Zone 12b?
The average last spring frost date for Zone 12b is Jan 1. The first fall frost averages Dec 31, giving a 364-day growing season.
Can I grow Watercress in Zone 12b?
Yes. Watercress needs 50 days to harvest. Zone 12b has a 364-day growing season, which is sufficient. You can plant up to 22 successions.
What is the best month to plant Watercress in Zone 12b?
The best time to start Watercress in Zone 12b is Nov. Begin seeds indoors around Nov 20, then transplant outdoors after the last frost date of Jan 1.
How long does Watercress take to harvest?
Watercress takes approximately 50 days from planting to harvest. In Zone 12b, expect your first harvest around Jan 22.
Plan Your Watercress Garden
Track Watercress from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
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