Prunella vulgaris wild in Provence Living Walls for Outdoor Spaces Outdoor Living Walls New York Top 9 Nuclear Power Companies Leading the Global Energy Future Vegan Breakfast Hash The Urben Life Common Houseplant Care Extension West Virginia University Plant your poppies when it's cold! Poppy seeds require a period of cold to germinate and grow, so they generally do best when planted in the late fall or early spring.