How to Make Fake Plants Look Real Dream a Little Bigger Amazon.com : Ficus Tree Fertilizer Liquid Plant Food for Lush Foliage, Stronger Roots & Healthy New Growth, 8 oz : Patio, Lawn & Garden Succulent Arrangement Juliette Kitten Planter Filled with Succulents 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.