Help! My grass is turning yellow!

Chlorosis in lawns

Is your lawn St. Augustine lawn turning chartreuse or yellow? With the higher temperatures of summer, a common issue in St. Augustine lawns is chlorosis. Chlorosis is a lack of chlorophyll caused by a deficiency of much-needed nutrients such as Nitrogen and Iron. When soil temperatures and pH are too high, it’s difficult for lawns to take up these nutrients, even if they are available in the soil. Soil compaction and poor soil health also contribute to the problem.

Combine the rise in temperatures with all the heavy rainfall we’ve had this spring and Chlorosis can become a bigger problem. Heavy rain can leach nutrients like Nitrogen out of your soil.

By feeding the soil and stimulating microbial growth, your lawn can better absorb the needed nutrients, even during the summer months. Adding organic matter can help bring down the pH a bit, which helps with nutrient uptake. If you are a Soil Building Program customer you’ll receive balanced feedings year-round.

Our May-June lawn treatments are filled with liquid bio-stimulants, worm castings and micronutrients will help keep your lawn and landscape healthy and well-fed. In June-July, we add a dry organic fertilizer that will continue to feed the turf to alleviate any deficiencies that might persist through the heat of summer.

Disease Alert: Yellowing in a St. Augustine lawn could also be associated with the disease Take-All Root Rot. This disease is running rampant in the DFW area right now, so call for a consultation of you’re unsure whether your lawn is suffering from Chlorosis or TARR. Chlorosis often appears more evenly throughout the whole lawn, while TARR may appear in irregular patches.

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