How to Use a Broadcast Spreader?

What You Need to Know

A broadcast spreader, also called a rotary spreader, is the most efficient tool for fertilizing medium to large lawns. It uses a spinning disc to fling granules in a wide arc, covering a swath of 6 to 12 feet depending on the model. Learning to use one correctly prevents uneven application, striping, and wasted product.

Start by selecting the correct spreader setting. Every fertilizer bag lists recommended settings for common spreader brands on its label. If your spreader brand is not listed, start with the hopper opening set to one-third open and test on a hard surface like a driveway. Sweep up the applied granules, measure the area covered and the amount of product used, and adjust the setting up or down as needed.

Fill the hopper while standing on a hard surface like a driveway or sidewalk, never on the lawn. This allows you to sweep up any spills before they concentrate fertilizer in one spot and cause burn. Close the hopper gate before filling and double-check that it is fully closed.

The most effective application pattern uses two passes at perpendicular angles. Set your spreader to deliver half the total recommended rate, then walk in parallel north-south passes across your lawn. Overlap each pass so that the outer edge of the previous throw pattern meets the center of the current pass. After covering the entire lawn, refill if needed and make a second set of passes in an east-west direction. This cross-hatch pattern ensures that every square foot receives even coverage, compensating for the natural variation in broadcast throw patterns.

Walking speed significantly affects distribution. Most broadcast spreaders are calibrated for a walking pace of approximately three miles per hour, which is a comfortable, steady stride. Walking too fast reduces the amount of product deposited per square foot, while walking too slowly over-applies. Maintain a consistent pace throughout the application.

Handle the perimeter of your lawn carefully. Walk along the edges of the lawn with the spreader throwing product inward, away from sidewalks, driveways, flower beds, and waterways. Many spreaders have a side-shield or edge guard feature that blocks the throw on one side. Use this feature along borders to prevent fertilizer from landing on hard surfaces where it can wash into storm drains.

Always close the hopper when you stop walking, reach the end of a pass, or make a turn. Leaving the hopper open while stationary or turning deposits excess fertilizer in concentrated spots. Open the gate only after you have begun walking forward at your normal pace for the next pass.

After finishing the application, sweep any fertilizer granules from hard surfaces like driveways, sidewalks, and patios back onto the lawn. This prevents nutrient runoff into waterways and ensures all purchased product ends up where it benefits your lawn.

Clean your spreader after every use. Fertilizer salts are corrosive and will damage metal and plastic components over time. Rinse the hopper, spreader plate, and frame with a garden hose, then allow all parts to dry before storing. Applying a light coat of spray lubricant to metal parts prevents rust.

For the most accurate results, weigh the fertilizer you plan to apply based on your lawn size calculation rather than eyeballing the hopper fill level. This ensures you apply exactly the recommended amount per 1,000 square feet and allows you to verify your spreader setting is accurate.