Difference between Cacti, Succulents, and Euphorbia Smart Plant & Tree Care How Cold is Too Cold for Succulents THE NEXT GARDENER Thenextgardener 106,272 Succulent Drawing Royalty Free Images, Stock Photos & Pictures Shutterstock 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. A Guide On How To Plant Succulents How to Identify, Treat, and Prevent Powdery Mildew on Succulents