15 Heat Tolerant Annuals That Thrive in Summer Sun Garden Like a Pro: How to Grow Peppers from Seed Indoors Sow Right Seeds How to Plant in Pots 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. 20 Desert Rose Seeds. Mixed Colors. Includes Double and Triple Petals. Adenium Obesum. Etsy