When to Plant Pac Choi in Cowichan Valley, BC
Pac choi (baby bok choy) is a compact variety of Chinese cabbage with tender leaves and crisp stems. It grows quickly and is ideal for containers and small spaces.
Cowichan Valley, British Columbia is in USDA Zone 9a. The average last spring frost is March 5 and the first fall frost is November 10, giving you a growing season of approximately 250 days.
At an elevation of 147 feet, Cowichan Valley receives approximately 63.5 inches of rainfall annually with predominantly podzolic loam soil. Summer highs average 96°F, so Pac Choi may need afternoon shade and extra watering during peak heat. Ample rainfall means less supplemental watering, but ensure good drainage to prevent Pac Choi root diseases.
Cowichan Valley Soil Profile
Soil Type
Podzolic Loam
Soil pH
6.0-7.0
Drainage
Well Drained
Plant Planting Risk Windows
Percentages indicate frost risk at transplant. The 70% safe window means there is a 30% chance of frost after transplant — suitable for cold-hardy crops or gardeners with frost protection. The 90% safe window is best for tender plants.
How to Plant Pac Choi
Fall planting: Sow 8 weeks before your first frost date for a fall harvest.
Plant Water Budget
Monthly Watering Guide for Pac Choi
Pac Choi needs approximately 1.5 inches of water per week (6.5" per month). Here's how your county's rainfall compares month by month.
| Month | Pac Choi Needs | Rainfall | You Supplement | Action |
|---|---|---|---|---|
| Jan | — | 2.7" | 0" | ❄️ Dormant |
| Feb | — | 2.7" | 0" | ❄️ Dormant |
| Mar | 6.5" | 4" | 2.5" | 💧 Light watering |
| Apr | 6.5" | 5.9" | 0.6" | 💧 Light watering |
| May | 6.5" | 8.1" | 0" | ✅ Rainfall sufficient |
| Jun | 6.5" | 7.9" | 0" | ✅ Rainfall sufficient |
| Jul | 6.5" | 6.4" | 0.1" | 💧 Light watering |
| Aug | 6.5" | 6.3" | 0.2" | 💧 Light watering |
| Sep | 6.5" | 5.3" | 1.2" | 💧 Light watering |
| Oct | 6.5" | 5.9" | 0.6" | 💧 Light watering |
| Nov | 6.5" | 4.5" | 2" | 💧 Light watering |
| Dec | — | 4" | 0" | ❄️ Dormant |
Water needs are for active growing months only (Mar–Nov in Cowichan Valley). Supplement amounts are based on average rainfall — actual needs vary with temperature, soil, and mulching.
Pac Choi Heat Requirements (GDD)
What are Growing Degree Days (GDD)?
Growing Degree Days measure the total warmth your plants receive during the growing season. Think of it as a "heat bank" — every day above 50°F deposits warmth that helps your plants grow.
Each plant needs a certain amount of accumulated heat to mature. If your county provides more GDD than the plant needs, it's a great fit. If it's close, you may want to choose faster-maturing varieties or start seeds indoors to get a head start.
Pac Choi Planting Timeline — Cowichan Valley, BC
Pac Choi Planting Calendar
| Activity | When | Date Range |
|---|---|---|
| Start Indoors | February 5 | Feb 5 – Feb 19 |
| Transplant Outdoors | March 5 | Mar 5 – Mar 19 |
| Direct Sow | February 12 | Feb 12 – Mar 5 |
| Harvest | April 16 | Apr 16 – May 14 |
| Fall Sowing | September 15 | Sep 15 – Sep 29 |
Plant 1" deep · 15" apart · Rows 24" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | — |
| February | Start Indoors Direct Sow |
| March | Transplant Outdoors Direct Sow |
| April | Harvest |
| May | Harvest |
| June | — |
| July | — |
| August | — |
| September | Fall Sowing |
| October | — |
| November | — |
| December | — |
Growing Conditions
☀️ Sun
Partial Shade (3-6 hours)
💧 Water
1.5"/week · 1-2 times/week
📅 Days to Maturity
40–55 days
🧪 Soil pH
Needs 6–7.5 · Your soil: N/A
🗺️ USDA Zone
Zone 9a
📆 Growing Season
250 days in Cowichan Valley
Growing Tips for Pac Choi in Cowichan Valley
With summer highs reaching 96°F in Cowichan Valley, provide afternoon shade for Pac Choi and water deeply in the morning.
Your generous 250.0-day season in Cowichan Valley allows multiple plantings of Pac Choi. Sow every 20.0 days for continuous harvest.
Common pests for Pac Choi in this region include cabbage worm and flea beetles. Use row covers early in the season and inspect plants weekly.
General growing tips
Direct sow in spring or fall. Grows best in cool weather. Space 6 inches apart for baby pac choi. Harvest whole plants or cut outer leaves as needed.
Companion Planting
Good Companions
Avoid Planting Near
Check more plant combinations with our Companion Planting Checker →
Pac Choi in Other Locations
Frequently Asked Questions
When should I plant Pac Choi in Cowichan Valley, BC?
Cowichan Valley is in Zone 9a with an average last frost of March 5. Plan your Pac Choi planting based on this frost date — see the calendar above for exact timing.
What planting zone is Cowichan Valley, BC?
Cowichan Valley, British Columbia is in USDA Hardiness Zone 9a. The average last spring frost is March 5 and first fall frost is November 10.
Your Cowichan Valley Garden Planner — Free
A 24-page printable planner built for Cowichan Valley (Zone 9a). Planting dates, a month-by-month schedule, harvest log, seed inventory, and succession charts — all dialed in for your exact growing season.