Potted plants are a great way to bring colour to your deck or porch, but without proper drainage, the water from them can rot your deck surface. Elevate your plants with pot risers so the deck surface can properly dry out.
Image from elleyo.
Traditional pot saucers trap water underneath them, and don't let air get under the plant to dry it out. Some simple pot risers, like these ones you can get from Bunnings,, leave room between the deck and the bottom of your pot for air circulation. Even an inch or two of space gives the deck a chance to dry out between waterings and saves it from rot or expensive repair.