Yellowing grass - Knowledgebase Question - Garden.org

Garden Planning

Scotts Valley, Ca

Question by iesha6
June 15, 2007

Our grass is turning yellow. It looked wonderful last year at this time and was pretty green a few months ago, but is now yellowing at the edges and starting to have yellowing patches. It was fertilized about a month ago, but that hasn't helped.

Answer from NGA
June 15, 2007

0	It's really difficult to diagnose a lawn problem without actually seeing it. However, there are a couple of reasons for yellowing spots in lawns; dog urine is the most common, fungal diseases, or sprinklers that are missing those spots. To have the healthiest, greenest lawn possible, water deeply once a week (twice if the weather is really hot) to force the roots to penetrate deeply. Deep rooted grasses don't need as much water as those that are shallow rooted, and won't turn brown as easily. (Frequent, light watering will keep the roots close to the surface, making them dry out faster in warm weather and require even more frequent watering.) It's best to measure the amount of water your sprinkler puts out so you'll know how long to keep the water running. Put some tuna cans out on the lawn and turn on the sprinkler. Leave it on for 15 minutes, then check the water level in the cans. If there's not an inch of water in the cans, turn the water on again and continue to time how long it takes to get one inch of water in the cans. This will let your know how long you'll need to water to supply one-inch of water per week to your lawn. Put your lawn on a regular feeding and mowing schedule, too. Feed in April, June, September and December with a 3-1-2 ratio of nitrogen, phosphorus, potassium. Mow when blades are 1 1/2" to 2" high. Don't let the grass grow really tall and then mow or you'll take off too much of the living tissue and scalp the lawn. Hope following the above guidelines will give you the greenest lawn on the block!

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