Definition of undergrowth for Students. : low growth on the floor of a forest that includes shrubs, herbs, and saplings.
From Organic Gardening Magazine, July/August 2000 Issue. Miracle-Gro is a synthetic fertilizer that contains ammonium phosphate and several other chemicals that can be toxic to your soil and plants. It is prohibited from use in certified-organic farming.
How safe is Preen? Asked April 9, 2014, 2:00 PM EDT. My church is considering the use of the product Preen to control weeds in our flower beds. I understand that it is a pre-emergent herbicide that prevents weed seeds from germinating and does not work on weeds that have already started growing.