Lawn
Choosing a lawn grass in the transition zone
Atlanta sits where the warm-season and cool-season grass regions overlap, which means no species here is entirely comfortable. The choice is a trade, and the deciding number is how much sun the area really gets.
The UGA ratings, side by side
These come from UGA Extension Bulletin 1533-1, which is the current reference for lawn species selection in Georgia.
| Species | Shade | Sun | Establishment | Best adapted to |
|---|---|---|---|---|
| Tall fescue (cool season) | Good | Good to fair | Fast | Mountains and Piedmont |
| Zoysiagrass | Very good to good | Excellent | Slow | Statewide |
| Centipedegrass | Good to fair | Excellent | Slow | Statewide |
| St. Augustinegrass | Very good to good | Very good | Fast | Coastal Plain to Piedmont |
| Hybrid bermudagrass | Fair to poor | Excellent | Fast | Statewide |
| Common bermudagrass | Very poor | Excellent | Fast | Statewide |
UGA notes that turfgrasses need roughly four hours of full to filtered sun a day, and gives cultivar-level figures: zoysiagrass holding acceptable quality at about four to four and a half hours of filtered or intermittent sun, St. Augustinegrass at five to six hours, and TifTuf and Celebration bermudas down to about five and a half hours after six years under heavy hardwood shade.
What that means on a wooded Sandy Springs lot
Most of these yards have three light conditions at once: an open front strip, a partially shaded middle, and a fully shaded back under the canopy. Treating them as one lawn is the source of most of the frustration.
- Genuinely open sun. Hybrid bermuda for wear tolerance and fast recovery, or zoysiagrass if a finer texture and less mowing matters more than recovery speed.
- Partial shade, four to six hours. Zoysiagrass. UGA calls it the most shade tolerant and best warm-season grass to grow beneath mature trees, and this is where it earns that.
- Under four hours. Not a lawn. Convert it to a bed and stop paying for the argument every spring. See planting under hardwoods.
- Winter colour matters more than anything. Tall fescue is the only option that stays green through a Georgia winter, and it is well adapted to the Piedmont. The cost is that it is a cool-season grass carrying an Atlanta August, its southern adaptation limit runs somewhere around Griffin, and it usually wants overseeding each fall.
Establishment windows
From UGA Extension Bulletin 1533-2. Getting these wrong is the most avoidable expense in a lawn project.
| Species | Seed | Sod, sprig or plug |
|---|---|---|
| Tall fescue | 5 to 6 lb per 1,000 sq ft, September to October or late February to March | Sod in the same windows; UGA notes fescue sod in winter is acceptable |
| Zoysiagrass | 1 to 3 lb per 1,000 sq ft, May to June, seeded cultivars only | Sprig 1 to 3 bushels per 1,000 sq ft, plug or sod May to June |
| Common bermudagrass | 1 to 2 lb hulled or 3 to 6 lb unhulled per 1,000 sq ft, May to June | Sprig 5 to 10 bushels per 1,000 sq ft, May to June |
| Hybrid bermudagrass | Cannot be seeded, hybrids are sterile | Sod, sprig or plug, May to June |
| Centipedegrass | a quarter to 1 lb per 1,000 sq ft, May to June | Plug or sod, May to June |
| St. Augustinegrass | Cannot be seeded | Sod, sprig or plug, May to June |
The rule behind the warm-season dates is soil temperature: UGA advises sowing when the temperature at four inches is consistently 65 degrees and rising, which is mid to late spring here, with first to mid August as the general latest date. UGA is also explicit that dormant sodding of warm-season grasses is the riskier option, with increased winter injury observed on zoysia and centipede compared with bermuda when sodded late.
Watering a new lawn, legally
Georgia law restricts outdoor irrigation for planting and maintaining plants to the hours between 4 p.m. and 10 a.m., under O.C.G.A. 12-5-7 as added by the Water Stewardship Act of 2010. New turf is exempt during installation and for 30 days immediately following the date of installation, which is the establishment period. After that the normal hours apply. Drip irrigation, soaker hoses, and hand watering with an automatic cutoff or handheld container are exempt from the time limitation without any 30-day limit.
The soil half of the job
A lawn laid over a compacted subgrade stays a compacted lawn. On Piedmont clay the preparation is what determines whether the sod roots in: grading first, then relieving compaction, then a soil test through the county extension office because these soils tend acidic and turf prefers ground closer to neutral. Clay also absorbs slowly, at around half an inch of water per hour by the Metro Water District's figure, so irrigation on a new lawn wants short cycles with soak time rather than one long run. That is covered in the irrigation page.
The honest recommendation
Most Sandy Springs properties end up with a smaller, better lawn than the one they started with. Reducing turf to the areas that have the light, converting the rest to woodland bed, and choosing zoysiagrass for the marginal ground gives a yard that costs less to run and looks better nine months of the year. It is also the version that survives the canopy continuing to grow, which it will.
Sources
UGA Extension Bulletin 1533-1, Lawns in Georgia: Selection and Species. UGA Extension Bulletin 1533-2, Lawns in Georgia: Establishment. UGA Extension Bulletin 1590 on trees and lawns. O.C.G.A. 12-5-7 for the watering schedule. Metro North Georgia Water Planning District for the clay absorption figure.