Find out the planting soil she uses, the best container for them, and more with these tips from Martha’s head gardener. NBC / Getty Images It feels like Martha Stewart can do it all: She can cook, she can host, she can wear fabulous linen pants, and she can even help Snoop Dog host the Olympics. She can, of course, also teach us all a thing (or 12) about gardening.In a post on her Instagram...