Grass dries out much more quickly in the summer heat. “As temperatures cool during the fall, your lawn will need less and less water,” Rossi says. Gradually reduce your watering as temperatures drop to match your lawn's need.
When the air and soil temperatures consistently fall below 40 F, it's time to stop watering. The ground can't absorb water once the top few inches freeze. Continue to water your plants up until this point so they're as well-hydrated as possible going into winter.
It is ideal to water lawns about one inch of water per week. To determine how long you need to water to get one inch, place a plastic container in your yard and set a timer. On average, it will take 30 minutes to get a half inch of water. So, 20 minutes, three times per week will give a lawn about an inch of water.
In fall, plants do not need as much water as they may have needed in summer. But rather than stop watering altogether, it's best to wean them from weekly watering to every other week to monthly throughout fall.
If you have recently aerated and seeded, light frequent watering twice per day to the point of light puddling until the seed has germinated is key. Once the seedlings have reached 2 inches tall, watering can be cut back to once daily.
DON'T water too frequently—or not frequently enough.
Instead, opt for a less frequent watering routine that thoroughly saturates the soil. This method encourages the plants' roots to reach deeply for residual water, even when the surface of the soil appears dry.
While this varies depending on weather and your local conditions, frequently usually means once or twice a day. As the plants grow bigger and become established, water less frequently but deeper. Eventually work towards watering every other day or two, giving the roots time to dry out in between waterings.
Fall means cooler temperatures, which is great for lawns. However, you'll still want to water your grass until freezing temperatures arrive. When it's freezing outside, water won't penetrate the frozen ground, so avoid watering when the temperature is 30 degrees Fahrenheit or below.
The colder weather does not evaporate moisture from the lawn as quickly as it does in the warmer weather. Most lawn experts recommend watering your grass until the soil or ground temperature reaches the 40-degree Fahrenheit mark. It is true, less water is required and needed when the temperature drops.
Cut back on watering.
With limited sunlight in winter, plants use less water than they do when they are actively growing in spring and summer. "A plant that you watered every week in summer might now prefer to go two weeks without water," Marino says.
If your sprinkler output is 1½ inches per week, your sprinklers should run for only ⅓ hour or 20 minutes that week (½ divided by 1½). On a twice-weekly watering schedule, run your sprinklers 10 minutes each time.
Sprinklers should be set to run for about 30 to 35 minutes at a time twice a week. Your goal is at least 1″ of water a week for your lawn. When it's hot and dry, double the water times while still trying to water just 2 or 3 days a week.
Avoid watering grass on a hot afternoon when it's 95 degrees or higher. The best time to water grass is at dawn or in the early evening. Water deeply three times a week instead of a little water daily. Test whether your sprinkler system is watering your lawn evenly.
1. If a plant is overwatered, it will likely develop yellow or brown limp, droopy leaves as opposed to dry, crispy leaves (which are a sign of too little water). Wilting leaves combined with wet soil usually mean that root rot has set in and the roots can no longer absorb water.
Generally, deep watering means that the soil is saturated to about an 8-inch depth. Healthy plants usually grow their roots down deep. In fact, some plants grow roots that are nearly two feet long for optimal nutrient and moisture uptake.
Don't water everyday.
The more shallow your grass roots are, the less hearty it will be in hot weather. Instead water about two times per week for longer periods of time.
Between irrigation and natural rainfall, your grass should receive between 1 and 1.5 inches of water each week during the summer. Water deeply every other day for the best results. Your turf should receive about 1/3 an inch of water every two days in order to maintain deeper roots, thus helping protect against drought.
During really hot weather, water your vegetables at least two to three times a week. Watering the garden deeply is critical. The water must go down, down, down to encourage deep roots and get away from the hot soil surface.
Know Your Grass
Cool-season grasses such as fescue, rye, or even bluegrass do not necessarily go completely dormant during the winter months. It's a good idea to water them every now and then on a mild day when there is no threat of a hard freeze overnight.
Watering after fertilizing washes the fertilizer off of the grass blades and into the soil, where it can get to work nourishing your lawn. It's also important because if fertilizer sits too long without being watered in, it can burn the grass.
Fertilizing in early fall helps your lawn begin rebuilding grassroots that were damaged during the hot, dry summer. Since fall is also a great time to kill several types of lawn weeds, including clover and dandelion, you can do two jobs at once (boom!)
1. Water Thoroughly: Rotor zones should run for about 30-40 minutes per zone and spray zones 10-15 minutes per zone. 2.
WATERING SCHEDULE
Deep watering helps to encourage deep root growth. Deeper roots stay cooler and stronger to better protect your lawn and garden from heat stress. Allow a deep watering at least once per week, twice if the temperature exceeds 100 degrees or more for several days in a row.
Many grasses can stay in dormancy for 3-4 weeks without beginning to deteriorate to the point of plant death. When the prolonged period without rain ends, the turf is able to regenerate from rhizomes and stolons.