Not everyone would want to live in their work space, but in Miyoko Yasumoto’s case, it’s an appealing setup. “I live amid flowers,” the Japanese French floral designer says, sitting in her loft-style home in the Parisian suburb of Aubervilliers. All around her are colorful floral arrangements, some finished and ready to go to her clients, others still waiting for that final touch—a bit of foliage, say, or a showpiece bloom. On the wall hangs a half-completed weaving she’s making with pressed wildflowers and linen, while behind her, a floor-to-ceiling window opens onto a leafy courtyard.

Yasumoto worked as a designer before retraining in floristry at Paris’ École des Fleuristes in 2016. She established her floral atelier, Une Maison dans les Arbres, in 2018, after a stint ...