Yolanda Palmer ushers visitors throughFoliage, past towering ferns, hanging ficus, and monstera with leaves that look like Swiss cheese, to the 300-square-foot greenery hotel nestled in back of her plant boutique. Here, close to a dozen clivia, hibiscus and succulents soak in the sun under floor-to-ceiling windows. On cloudy days, high-powered, infrared grow lights help turn stalks green and lush. Palmer repots, fertilizes, and sprays neem oil so bugs don’t get too comfortable. She puts all her visiting plants on strict watering schedules — too much water is worse than too little. Bruised leav…