When to Plant Portulaca in California

Portulaca (Portulaca grandiflora), commonly called moss rose, is a succulent- stemmed annual built for hot, dry, low-fertility conditions where other flowers fail. Its silky, rose-like blooms open in full sun and close at night or on cloudy days. Excellent for slopes, rock gardens, containers, and parking-strip plantings where irrigation is limited. One of the easiest annuals for neglect- proof summer color.

California spans USDA hardiness zones 10a, 10b, 6b, 7a, 7b, 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 Portulaca planting dates based on your local frost dates.

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Portulaca Planting Calendar for California

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

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

Activity	When	Date Range
Start Indoors	December 4	Dec 4 – Dec 18
Transplant Outdoors	November 27	Nov 27 – Dec 11
Direct Sow	November 27	Nov 27 – Dec 18
Bloom	January 15	Jan 15 – Aug 20

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

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

Activity	When	Date Range
Start Indoors	December 4	Dec 4 – Dec 18
Transplant Outdoors	November 20	Nov 20 – Dec 4
Direct Sow	November 20	Nov 20 – Dec 11
Bloom	January 8	Jan 8 – Aug 27

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

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

Activity	When	Date Range
Start Indoors	February 27	Feb 27 – Mar 13
Transplant Outdoors	April 10	Apr 10 – Apr 24
Direct Sow	April 10	Apr 10 – May 1
Bloom	May 29	May 29 – Sep 18

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

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

Activity	When	Date Range
Start Indoors	February 25	Feb 25 – Mar 11
Transplant Outdoors	March 25	Mar 25 – Apr 8
Direct Sow	March 25	Mar 25 – Apr 15
Bloom	May 13	May 13 – Sep 9

▸ Zone 7b ~235 day growing season · Full guide →

Last frost: March 18 · First frost: November 8 · 235 day season

Activity	When	Date Range
Start Indoors	February 18	Feb 18 – Mar 4
Transplant Outdoors	March 18	Mar 18 – Apr 1
Direct Sow	March 18	Mar 18 – Apr 8
Bloom	May 6	May 6 – Sep 16

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

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

Activity	When	Date Range
Start Indoors	February 8	Feb 8 – Feb 22
Transplant Outdoors	March 1	Mar 1 – Mar 15
Direct Sow	March 1	Mar 1 – Mar 22
Bloom	April 19	Apr 19 – Sep 13

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

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

Activity	When	Date Range
Start Indoors	January 28	Jan 28 – Feb 11
Transplant Outdoors	February 11	Feb 11 – Feb 25
Direct Sow	February 11	Feb 11 – Mar 4
Bloom	April 1	Apr 1 – Sep 9

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

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

Activity	When	Date Range
Start Indoors	January 13	Jan 13 – Jan 27
Transplant Outdoors	January 27	Jan 27 – Feb 10
Direct Sow	January 27	Jan 27 – Feb 17
Bloom	March 17	Mar 17 – Sep 22

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

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

Activity	When	Date Range
Start Indoors	December 28	Dec 28 – Jan 11
Transplant Outdoors	January 4	Jan 4 – Jan 18
Direct Sow	January 4	Jan 4 – Jan 25
Bloom	February 22	Feb 22 – Sep 13

Growing Tips for California

Direct-sow after last frost once soil warms to 65°F, or start indoors 4–6 weeks before last frost. Seed is tiny — surface sow and do not cover. Thin to proper spacing after germination. Thrives in poor, well-drained soil; rich or wet soil produces lush foliage but fewer blooms. No deadheading required — plants are self-cleaning. Double-flowered varieties hold blooms open longer in overcast conditions.

Portulaca in Other States

Frequently Asked Questions

When should I plant Portulaca in California?

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

What zone is California for planting?

California contains USDA hardiness zones 10a, 10b, 6b, 7a, 7b, 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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