How to Grow a Mango Tree Fast Using a Paper Towel at Home 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. Canute (I) King of England, Denmark, Norway, Sons, & Vikings Britannica Dicksonia antarctica Sloat Garden Center Summer Wine Ninebark Philodendron Erubescens 'White Wizard Aurea' (wk17 C)