What are the five rules?
- Identify your grass.
- Fix the underlying problems first.
- Water at the right times.
- Know when to mow.
- Feed the soil, starting with a test.
None of them take special equipment. They take paying attention to the lawn you actually have, which is where most beginners slip.
Rule 1: What kind of grass do you have?
Everything else depends on this. UT Extension names tall fescue the most common cool-season lawn grass in Tennessee and Bermuda the most common warm-season one (UT Extension W1068). They need nearly opposite care.
- Tall fescue stays green most of the year, grows in clumps, and has medium to coarse blades, wider than most people expect. It slows down and can go off-color in summer heat.
- Bermuda has fine blades, spreads by runners above and below ground, and goes tan from late fall until spring green-up.
- Zoysia is less common here: dense, stiff and slow-spreading, and also brown in winter.
The quickest test is a January walk. Green grass is fescue; tan grass with runners is Bermuda or zoysia.
Rule 2: Why fix thin spots and weeds first?
Fertilizer and water spread on a thin, weedy lawn mostly grow more weeds. Start with the ground itself:
- Control weeds. A crabgrass pre-emergent goes down when soil at 2 inches has averaged 55°F for several days, about when forsythia blooms, with a second application 6 to 8 weeks later (UT Extension lawn calendar). Broadleaf weeds such as dandelion and clover are spot-sprayed as they come up.
- Aerate. Core aeration loosens compacted clay so water and nutrients reach the roots.
- Overseed. Seeding thin fescue between late August and mid-October fills the gaps. Our post on repairing a patchy lawn walks through it step by step.
Rule 3: When should you water?
Early morning is the best time of day all year. UT Extension suggests roughly 5 to 9 a.m., when less water evaporates and the blades dry quickly afterward (UT Extension W161-F). The day of the week doesn’t matter; the weather does. Skip watering when it’s raining or windy, and let a rain gauge tell you what nature already delivered.
Water when the grass asks for it: leaves that fold or turn bluish-gray, and footprints that stay pressed into the lawn. A dormant Bermuda lawn in January needs almost nothing. Overwatering is the more common beginner mistake, and it brings fungus and shallow roots.
Rule 4: How often should you mow?
Mow by growth, not by the calendar. The rule UT Extension gives is to remove no more than one-third of the leaf at a time (UT Extension W161-I), so a fescue lawn kept at 3 inches gets mowed when it reaches about 4½. In a wet May that can be every four or five days; in a dry August, every couple of weeks.
Mow when the grass is dry, with a sharp blade, and leave the clippings on the lawn. Keep tall fescue at 2 to 3 inches in cool weather and raise it to 2½ to 3½ for summer. LawnWise doesn’t mow, but how you mow shows up in how well every treatment works.
Rule 5: Why feed the soil, starting with a test?
A soil test tells you the pH and which nutrients are short, so you buy what the lawn needs and nothing else. UT Extension runs them through every county office.
You’ll sometimes read that bio-nutrient fertilizers fix nitrogen naturally. They don’t: lawn grasses can’t fix nitrogen, and it’s legumes such as clover that partner with the bacteria that do. What bio-nutrients do in our program is supplement the fertilizer. They go down with fertilizer and iron in rounds 3 and 4 of LawnWise Basic, as part of how we work to reduce pesticide use, and every round relies on slow-release nitrogen.
Want help from a local team?
LawnWise is locally owned and operated out of Franklin. Our Basic, Plus and Premier programs handle the weed control, feeding, lime, aeration and seeding, and Brown Patch prevention for you, round by round, with no contract. A free evaluation and consultation is how every new lawn starts with us.