The name says it all. But not all planters look the same, planters are design for the type of seed and how the seed needs to be placed in the soil. Grain, Alfalfa (Hay), and Grasses are planted with an implement that has many closely spaced tubes that feed the grain seed into the ground, these planters are usually called a Drill. Most all other crops, vegetables, corn etc. are planted in rows space farther apart to allow for irrigation, cultivations, and root growth space. The width of the rows will vary depending on the crop, growing conditions, and preference of the farmer. These planters will have a separate unit for each row. Each has a seed container, wheels, and mechanism to handle seed. Wheels rolling over the ground drive the mechanism that separates one seed at a time and places in the ground at the desired interval. The mechanical pieces that do this are called plates. The come in many different styles and patterns. These planter plates have become quite popular with crafters and artists, and are getting harder and harder to find, as new technologies no longer use these plates.