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Petunia

Use our zone-based planting guide to know when to plant petunia.

Plant name Zone Start seeds indoors (spring/fall) Start seeds outdoors (spring/fall) Plant seedlings/transplants outdoors (spring/fall) Plant spacing # plants per person
Petunia 3a Feb. 15-March 1 Not recommended On/around May 15 (after last frost) 10-14 inches n/a
Petunia 3b Feb. 15-March 1 Not recommended On/around May 15 (after last frost) 10-14 inches n/a
Petunia 4a Feb. 15-March 1 Not recommended On/around May 15 (after last frost) 10-14 inches n/a
Petunia 4b Feb. 15-March 1 Not recommended On/around May 15 (after last frost) 10-14 inches n/a
Petunia 5a Jan. 15-Feb. 1 Not recommended On/around April 15 (after last frost) 10-14 inches n/a
Petunia 5b Jan. 15-Feb. 1 Not recommended On/around April 15 (after last frost) 10-14 inches n/a
Petunia 6a Jan. 15-Feb. 1 Not recommended On/around April 15 (after last frost) 10-14 inches n/a
Petunia 6b Jan. 15-Feb. 1 Not recommended On/around April 15 (after last frost) 10-14 inches n/a
Petunia 7a Jan. 15-Feb. 1 Not recommended On/around April 15 (after last frost) 10-14 inches n/a
Petunia 7b Jan. 15-Feb. 1 Not recommended On/around April 15 (after last frost) 10-14 inches n/a
Petunia 8a Dec. 15-Jan. 1 Not recommended On/around March 15 (after last frost) 10-14 inches n/a
Petunia 8b Dec. 15-Jan. 1 Not recommended On/around March 15 (after last frost) 10-14 inches n/a
Petunia 9a 10-12 weeks before planting outside Not recommended Sept. 1-April 15 10-14 inches n/a
Petunia 9b 10-12 weeks before planting outside Not recommended Sept. 1-April 15 10-14 inches n/a
Petunia 10a 10-12 weeks before planting outside Not recommended Oct. 15-April 15 10-14 inches n/a
Petunia 10b 10-12 weeks before planting outside Not recommended Oct. 15-April 15 10-14 inches n/a
Petunia 11a 10-12 weeks before planting outside Not recommended Nov. 1-March 30 10-14 inches n/a
Petunia 11b 10-12 weeks before planting outside Not recommended Nov. 1-March 30 10-14 inches n/a

* Cool-weather annual that can be planted in early spring and also fall in Southern climates.