Objective: Americans spend nearly $44 billion on plants and plant care products each year, but more than a third of plants die within a year of purchase, according to the National Gardening Association. Last week, Red Consultancy helped launch a product that brings the Web to gardening: The EasyBloom Plant Sensor. The goal was to target amateurs who might be intimidated by gardening by positioning the gadget, which helps determine what plants will thrive in one's home, as “a botanist ...