Sod is one of the fastest ways to turn a brown patch of bare dirt into a lush green lawn. Yet that expanse of green can become spotted or lined with yellow quickly if the new sod doesn’t get proper care during installation and afterward.
Yellowing sod may or may not be salvageable, but you should still learn what caused your problem to avoid it with your next installation. Watch out for these five common causes of yellowing sod, some of which can start changing the color of the grass before it’s even installed.
Give The Sod Enough Water
Failing to water the sod quickly enough after installation, or allowing it to dry out too much while it’s stacked and waiting for installation, is the most common cause of yellowing. Whenever possible, stop and water the freshly laid sod after every few pieces, so they don’t dry out in the sun.
Water at least once a day, preferably twice daily, until the ground is soft enough to penetrate with a tool like a screwdriver easily. Skipping a day soon after installation can result in yellowing within hours, while yellow lines that trace the seams of the sod are a sign that the edges of the slabs dried out too much while waiting for installation.
Decrease Watering Levels
While brand new sod needs at least an inch of water applied once or twice a day, that much water harms a sod lawn a week or two old. You need to slowly and carefully taper down the amount of water you apply as roots grow in so that you don’t waterlog the delicate new growth. Start tapering off at the beginning of the second week, and cut down to watering a single time a day one day, then skip a day the next.
For the second week, extend the time between watering to three days, then an entire week. With a weekly watering schedule for the first few months of growth, the sod should have plenty of moisture to grow steadily without becoming waterlogged. If you water too much, the grass will turn yellow in patches or over the entire sod as the roots die off.
Avoid Unnecessary Fertilization
You might be tempted to feed your brand new sod by spreading some fertilizer within the first weeks of growth. However, the sod is given extra fertilization shortly before it is harvested. That fertilizer is designed to carry it through the establishment period, so there is good root growth without excessive vegetative growth.
Fertilizing too early can cause the sod to turn dramatically yellow and quickly die back and brown. Even slow-release fertilizers are often too strong for brand new sod and burn the roots or vegetation. The sod can’t properly absorb or utilize fertilize right after installation, so wait at least a month or two before feeding a new sod lawn.
Choose The Right Delivery Day
Timing the delivery of your new sod is the best way to prevent it from turning yellow after installation. Stress from direct sun exposure, hot temperatures, and windy conditions lead many pieces of sod to at least temporarily turn yellow before they recover. Choosing a cooler, calmer, cloudier day for your delivery is one of the easiest ways to keep the sod in top shape until it’s on the ground.
Roll The Newly Laid Sod
Finally, any pockets of air trapped between the sod and the dirt will prevent roots from growing correctly or receiving the moisture they need. These pockets will cause yellow patches to form that eventually die off, so prepare the site thoroughly and roll the sod to make sure every inch is making good contact with the ground.