How Often to Fertilize a Vegetable Garden for Healthier Plants and Better Harvests Orchid Wall Planter Print A Pot Mum's the Word Pesches Flowers & Garden Center Double Fertilization , Double fertilization is a unique feature of flowering plants where two fusion events occur inside the embryo sac. One male gamete fuses with the egg to form the zygote 50 days after sowing a variety of succulent seeds. Great growth!! : r succulents How to Grow Dahlias from Seed in 7 Easy Steps