Our favorite garden professor, Jeff Gillman, tells you how.
Well. Not how. I'm pretty sure you know how. He'll tell you why, though!
These and other amazing bits of information can be found in his clever and highly useful new book Decoding Gardening Advice, written with his co-author Meleah Maynard. We love the book; go check it out, and enjoy Dr. Gillman's advice.