Resin Planter with 3 Dividers and 3 Plastic Pots Plow & Hearth Choosing Container Plants For Shade And How To Maintain Them Gardening Know How Black Licorice Herb (2 Pack) Bonnie Plants Plant Seeds Of Kindness Inspirational Quote Art King Size Silvery White Strawflower Seeds Getting double blooms with lots of petals I think direct seeding zinnia seeds can help (right into the soil outside), but I oftentimes start them in trays because I find that easier.