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.
Answer from Pat: I agree that Moisture Control Miracle Grow is not a good type of potting soil and I would never recommend it to anyone. Unfortunately, there is nothing you can do to amend it or fix it.