AFTER: But simply moving indoor plants outdoors and grouping them in creative ways will allow your space to shine. The key to making your deck or patio a tropical paradise is to group the houseplants together so that they make both a vertical and horizontal statement. For example, plant towers, structures that hold a variety of potted plants, are the perfect way to display many hanging plants-and the simple grouping of multitextured plants makes a stunning centerpiece. Annual flowers and accent pillows add touches of color amid the greenery.