Sow outdoors in early spring, or fall in mild winter areas. Sow on the surface. For good coverage, mix the seeds with sand before sowing. Full sun. Easy to grow. Self sows.
Sowing Perennial Poppies:
Best sown indoors 8 weeks before the last frost date. Or sow outdoors in late spring to early summer. Sow on the surface. Full sun. Easy to grow. Self sows.”
“Sowing and Care Instructions for Corn Poppies:
Average planting success with this species: 80%
Height: 2-2 1/2 feet
Germination: 10-30 days
Optimum soil temperature for germination: 60-70F
Sowing depth: Surface Sow
Blooming period: March-July
Suggested use: Flower gardens, roadsides, meadows, mixtures, cut flowers. Miscellaneous: Not enough can be said about this all time gardening favorite. The seed pods are attractive for dry floral arrangements. Can be seen from great distances, guaranteed to make the neighbors jealous.
Sowing and Care Instructions for Papaver Species:
Sow on the surface. Papaver species often germinate best at cool ( 50-60 degrees ) temperatures. Plants are easy to grow, but do not like to be transplanted. Sow in place where plants will grow when possible. Prefers sunny spot with well drained soil. Seeds are long lived and can last from 3 to 20 years.
Sowing and Care Instructions for Eschscholzia Species:
Sow on cultivated soil. Can be fall planted in California, but should be Spring planted in cooler zones. Plants are easy to grow, but do not like to be transplanted. Sow in place when possible. Prefers sunny spot with well drained soil.”
I would sprinkle them as soon as the seed heads mature and break open.
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“Sowing Annual Poppies:
Sow outdoors in early spring, or fall in mild winter areas. Sow on the surface. For good coverage, mix the seeds with sand before sowing. Full sun. Easy to grow. Self sows.
Sowing Perennial Poppies:
Best sown indoors 8 weeks before the last frost date. Or sow outdoors in late spring to early summer. Sow on the surface. Full sun. Easy to grow. Self sows.”
“Sowing and Care Instructions for Corn Poppies:
Average planting success with this species: 80%
Height: 2-2 1/2 feet
Germination: 10-30 days
Optimum soil temperature for germination: 60-70F
Sowing depth: Surface Sow
Blooming period: March-July
Suggested use: Flower gardens, roadsides, meadows, mixtures, cut flowers. Miscellaneous: Not enough can be said about this all time gardening favorite. The seed pods are attractive for dry floral arrangements. Can be seen from great distances, guaranteed to make the neighbors jealous.
Sowing and Care Instructions for Papaver Species:
Sow on the surface. Papaver species often germinate best at cool ( 50-60 degrees ) temperatures. Plants are easy to grow, but do not like to be transplanted. Sow in place where plants will grow when possible. Prefers sunny spot with well drained soil. Seeds are long lived and can last from 3 to 20 years.
Sowing and Care Instructions for Eschscholzia Species:
Sow on cultivated soil. Can be fall planted in California, but should be Spring planted in cooler zones. Plants are easy to grow, but do not like to be transplanted. Sow in place when possible. Prefers sunny spot with well drained soil.”
I hope this helps you.