Amazon.com : Granular Lemon Tree Fertilizer Organic Slow Release Plant Food for Faster Growth, Stronger Roots & Higher Fruit Yield, 16 oz : Patio, Lawn & Garden Crepe Myrtles are starting to set seeds as the flowers finish. You can trick your plants into flowering again if you prune off the spent flowers and seed heads right now. Yes you can only do this if Plant Trellis For Pots (DIY with Natural Materials) Greenhouse Studio Seed Saving 101: How to Save Seeds from Annual Flowers ~ Homestead and Chill