For most lawn grasses to grow well in hot,dry weather they must be watered so that their stomata will remain open for longer periods of time to let in CO₂.

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When the soil is dry, grasses will close their stomata to conserve water, which limits their ability to take in carbon dioxide for photosynthesis. Watering the lawn will help keep the soil moist, which can prevent the stomata from closing and allow the grasses to continue photosynthesis even in hot, dry weather.

For Most Lawn Grasses to Grow Well in Hot,dry Weather