Use pre-cut markers that fit the pot or bed. Decide which end will enter the soil, then keep the plant name and painted decoration above that line. A short label is easier to read from the path than a long note written in small letters.
Before painting the full set, test the base coat, lettering and clear finish on one spare blank. Wood absorbs paint unevenly, and a finish can change the color or make pencil marks harder to cover. Follow the paint and finish labels for surface preparation, drying and outdoor use.
Keep the part that goes into soil uncoated unless the product label says that finish is suitable for that use. Do not place a marker in edible plants if its coating or paint instructions rule out contact with soil or food-growing areas.
Step images are illustrations. They show one possible sequence; fit and tool settings depend on your materials and equipment.