Here is a simple diagram that rocks pebbles in the bottom of your pot creates a 'perched water table' closer to the roots which increases the chance of rot. It's a myth that Upcycled Soup Tin Planters: A DIY Tutorial with a Vintage Touch Vita Grow Light Bulb White Wide Photo Picture Strange Unusual Plant Pot Stock Photo 683943772 Shutterstock Can sunflowers be grown in pots and how much space do they need?