When to Plant Bachelor's Button in USDA Zone 9b
June in Zone 9b — your action list
If you only do a handful of things in the garden this June, make it these. They're sequenced around your zone's frost timing.
Bachelor's Button (Centaurea cyanus), also called cornflower, is a carefree cool-season annual best known for its vivid cobalt-blue flowers — one of the truest blues in the annual garden. It tolerates light frosts, self-seeds prolifically, and thrives in poor to average soils. A traditional cut flower and pollinator magnet, it has been cultivated in gardens for centuries.
In Zone 9b, the average last spring frost is around January 25 and the first fall frost is around December 20, giving you a growing season of approximately 329 days.
Bachelor's Button Planting Timeline — Zone 9b
Where Is USDA Zone 9b?
The map below highlights the states that contain Zone 9b. Click any state to see the Bachelor's Button planting schedule for that location.
Bachelor's Button Planting Calendar — Zone 9b
| Activity | When | Date Range |
|---|---|---|
| Transplant Outdoors | December 21 | Dec 21 – Jan 4 |
| Direct Sow | November 23 | Nov 23 – Dec 14 |
| Bloom | February 15 | Feb 15 – Jun 7 |
| Fall Sowing | October 11 | Oct 11 – Oct 25 |
Plant 0.3" deep · 12" apart · Rows 12" apart
Month-by-Month Timeline
| Month | Activities |
|---|---|
| January | Transplant Outdoors |
| February | Bloom |
| March | Bloom |
| April | Bloom |
| May | Bloom |
| June | Bloom |
| July | — |
| August | — |
| September | — |
| October | Fall Sowing |
| November | Direct Sow |
| December | Transplant Outdoors Direct Sow |
Free Zone 9b Planting Calendar PDF
Know exactly when to plant every crop in your zone. Get a printable month-by-month calendar customized for Zone 9b with start dates, transplant windows, and harvest times.
Growing Conditions
Sun
Full Sun (6-8+ hours)
💧 Water
Low — drought tolerant
Days to Maturity
60–90 days
Soil pH
6 – 7.5
Zone Temperature Range
25°F to 30°F average annual minimum
Growing Season
329 days (Zone 9b average)
Planting Specifications
| Planting Depth | 0.3 inches |
| Plant Spacing | 12 inches apart |
| Row Spacing | 12 inches between rows |
Succession Planting Bachelor's Button in Zone 9b
Sow every 6.9 weeks for continuous harvest throughout the season.
Growing Tips for Bachelor's Button in Zone 9b
Zone 9b offers a long growing season (~329 days). You can plant Bachelor's Button earlier and may get multiple harvests.
Direct-sow in early spring as soon as soil can be worked; seeds need a brief cold period for best germination (refrigerate for a few days before planting if spring arrives quickly). In zones 6+, fall-sow for the earliest spring bloom. Thin to 12 inches; do not over-fertilize — too much nitrogen produces foliage at the expense of flowers. Deadhead to prolong blooming or allow self-seeding for a naturalized colony.
Companion Planting
Good Companions
The Gardener's Encyclopedia to Companion Planting
The pairings that make vegetables, herbs, and flowers grow better — and the ones that quietly wreck a bed.
- Proven pairings for 200+ vegetables, herbs, flowers, and fruits
- Full seed-starting + planting schedule with timing and spacing
- Bonus: square-foot gardening guide + printable seasonal planners
Saving Bachelor's Button Seeds
Recommended for Your Garden
Reduce heat stress and sun scorch in hot climates with UV-stabilized shade cloth.
Start seeds indoors with reusable cell trays and humidity domes.
Test your soil pH, nitrogen, phosphorus, and potassium levels before planting.
Related Plants
Bachelor's Button in Other Zones
Bachelor's Button by State
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Virginia
- Washington
- West Virginia
- Wisconsin
- Wyoming
Frequently Asked Questions
When should I plant Bachelor's Button in Zone 9b?
In Zone 9b, plan your Bachelor's Button planting around the average last frost date of January 25. Direct sow outdoors around November 23. Transplant seedlings around December 21.
Can Bachelor's Button grow in Zone 9b?
Yes, Bachelor's Button can grow well in Zone 9b, hardy in USDA zones 2a through 11b. Zone 9b has a growing season of approximately 329 days, which is sufficient for Bachelor's Button (60-90 days to maturity).
When can I harvest Bachelor's Button in Zone 9b?
In Zone 9b, expect to harvest Bachelor's Button from February 15 – June 7. Bachelor's Button takes 60-90 days from planting to harvest.
What is the last frost date for Zone 9b?
The average last spring frost in Zone 9b is around January 25, and the first fall frost is around December 20. This gives a growing season of approximately 329 days. These are 50% probability dates — actual frost dates vary year to year.
What should I plant next to Bachelor's Button?
Good companion plants for Bachelor's Button include Wheat, Grains, Tomatoes, Vegetables. These companions can help with pest control, pollination, and nutrient sharing.
Your Zone 9b Garden Planner — Free
A 22-page printable planner tailored to Zone 9b. Planting dates, monthly task lists, harvest log, seed inventory, and succession charts — everything you need to plan a full season.