When to Plant Larkspur in Arizona

Larkspur (Consolida ajacis) is a cool-season annual that produces tall, delicate spires of blue, purple, pink, and white flowers reminiscent of its perennial cousin, delphinium. Direct-sown into cold soil or fall-sown in mild-winter climates, it blooms in spring before going to seed as summer heat arrives. An excellent cut flower and cottage-garden staple.

Arizona spans USDA hardiness zones 10a, 6b, 7a, 8a, 8b, 9a, 9b (with planting data available), so planting dates vary by your location within the state. Click your zone below for the most accurate dates.

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Click your county for exact Larkspur planting dates based on your local frost dates.

Hover over a county to see details. Click to view planting guide.

Larkspur Planting Calendar for Arizona

▸ Zone 10a ~364 day growing season · Full guide →

Last frost: January 1 · First frost: December 31 · 364 day season

Activity	When	Date Range
Bloom	January 14	Jan 14 – Mar 25
Fall Sowing	November 5	Nov 5 – Nov 19

▸ Zone 6b ~205 day growing season · Full guide →

Last frost: April 3 · First frost: October 25 · 205 day season

Activity	When	Date Range
Direct Sow	March 6	Mar 6 – Mar 27
Bloom	May 15	May 15 – Jul 10

▸ Zone 7a ~221 day growing season · Full guide →

Last frost: March 25 · First frost: November 1 · 221 day season

Activity	When	Date Range
Direct Sow	February 25	Feb 25 – Mar 18
Bloom	May 6	May 6 – Jul 15
Fall Sowing	August 23	Aug 23 – Sep 6

▸ Zone 8a ~255 day growing season · Full guide →

Last frost: March 8 · First frost: November 18 · 255 day season

Activity	When	Date Range
Direct Sow	February 8	Feb 8 – Mar 1
Bloom	April 19	Apr 19 – Jul 26
Fall Sowing	September 9	Sep 9 – Sep 23

▸ Zone 8b ~276 day growing season · Full guide →

Last frost: February 25 · First frost: November 28 · 276 day season

Activity	When	Date Range
Bloom	November 28	Nov 28 – Mar 20
Fall Sowing	September 19	Sep 19 – Oct 3

▸ Zone 9a ~303 day growing season · Full guide →

Last frost: February 10 · First frost: December 10 · 303 day season

Activity	When	Date Range
Bloom	December 10	Dec 10 – Apr 1
Fall Sowing	October 1	Oct 1 – Oct 15

▸ Zone 9b ~329 day growing season · Full guide →

Last frost: January 25 · First frost: December 20 · 329 day season

Activity	When	Date Range
Bloom	December 27	Dec 27 – Apr 4
Fall Sowing	October 18	Oct 18 – Nov 1

Growing Tips for Arizona

Larkspur does not transplant well — direct-sow only. In cold climates (zones 2–6), sow directly in early spring as soon as soil can be worked, 4–6 weeks before last frost; cold soil improves germination. In zones 7–10, fall-sow 8–10 weeks before first frost for spring bloom. Press seeds lightly into soil; they need darkness to germinate — cover with 1/8–1/4 inch of soil. Thin to 6–12 inches to prevent powdery mildew. Allow seed pods to mature and self-sow for naturalized colonies. All parts are toxic if ingested.

Larkspur in Other States

Frequently Asked Questions

When should I plant Larkspur in Arizona?

Planting dates for Larkspur in Arizona depend on your USDA zone. Arizona spans zones 10a, 6b, 7a, 8a, 8b, 9a, 9b. Check the planting calendar above for your specific zone's frost dates and planting windows.

What zone is Arizona for planting?

Arizona contains USDA hardiness zones 10a, 6b, 7a, 8a, 8b, 9a, 9b. Your specific zone depends on your location within the state — northern and higher-elevation areas are in colder zones, while southern and coastal areas are warmer.

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