Can you fertilize brown grass in the summer?

Fertilizing brown grass in the summer is generally not effective and may even cause harm. Here's why:

1. Dormancy: During hot summer months, cool-season grasses like Kentucky bluegrass and fescue often go dormant to survive the heat and reduced moisture. Fertilizing dormant grass may not result in nutrient absorption or growth stimulation.

2. Heat Stress: High summer temperatures can cause heat stress in grass, making it more susceptible to damage from fertilizer application. Fertilizing heat-stressed grass can further exacerbate the stress and result in worsening its condition.

3. Nutrient Uptake: Grass primarily absorbs nutrients through healthy roots. Heat and drought can compromise root development and water uptake, making nutrient absorption less effective. Fertilizing without proper water availability may lead to nutrient runoff or buildup in the soil without benefiting the grass.

4. Disease and Pest Issues: Fertilizing brown or stressed grass can attract pests and diseases. Excess nutrients can promote disease development and make grass more vulnerable to pest infestations, further compounding the problems.

Instead of fertilizing brown grass in the summer, it's generally better to focus on proper watering and heat management to help the grass recover. Deep watering less frequently encourages deeper root growth, while avoiding excessive watering can help prevent disease issues. Proper mowing practices and removing weeds can also help the grass recover. Fertilization should be considered during the appropriate season (typically fall or spring) when grass is actively growing.