With an engineering degree, and horticulture, you know I've invented a Garden Design Equation, moons ago. Yes, good gardens are math. . Will do a long post about the Garden Design Equation, but not today. Promise, you will love the Garden Design Equation, and totally 'get' it. Have taught it in my college classes and seminars losing no one yet. . Living in our new American Farmhouse Architecture home, ca. 1900, for a total of 3 nites, the Garden Design Equation beckons. . Blessedly no…