Garden Like a Pro: How to Grow Peppers from Seed Indoors Sow Right Seeds TURBO! Mix Tropical Houseplant Soil Aroid Potting Soil Tropical Potting Soil Tropical Potting Mix Chunky Potting Soil Chunky Soil Etsy 15 Heat Tolerant Annuals That Thrive in Summer Sun 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.