My garden doesn't have any soil so it would have to be in a raised bed, can I just fill the planter with compost and away I go or do I have to include layers such as cardboard, stones and top soil to plant, also would I be able to plant the: Pronto Seed Bumper Pack Grow Your Own Kit - 24 Varieties of Flowers (available at Amazon) or would I have to stick to one type of flower.
