Landscaping in Sandy Springs, start to finish

The clay, and what it does and does not do

The soil under most of the Georgia Piedmont is a Cecil-type profile: a sandy loam surface a few inches deep over a red clay subsoil weathered out of granite and gneiss. The official USDA series description classifies Cecil as fine, kaolinitic and thermic, which matters more than it sounds. Kaolinite is a low-activity clay, and the series is rated low for shrink-swell potential. Georgia red clay is not the expansive smectite clay that heaves foundations in Texas or Colorado. It does not swell much and it does not shrink much.

What it does instead is refuse water at rate. The same series description records the soil as well drained with moderately high saturated hydraulic conductivity, yet also records surface runoff as medium, and the Metro North Georgia Water Planning District puts the practical figure for clay absorption at about half an inch of water per hour. An Atlanta summer thunderstorm exceeds that comfortably. Everything the ground cannot take in that hour runs across the surface instead, and on a graded lot it runs downhill fast.

The second thing clay does is compact. Once the surface layer is driven over or worked wet, the pore structure collapses and infiltration drops further. That is why so many landscape failures here trace back to the construction phase rather than to the planting, and why bed preparation on this soil is done broad and shallow rather than by digging a deep hole and filling it with bagged mix. There is more on the mechanics in the red clay guide.

The canopy, and the arithmetic of shade

Sandy Springs is a wooded city and the trees are protected by ordinance, so on most lots the mature oaks, hickories and tulip poplars are a fixed input to the design rather than an option. That has one immediate consequence for anyone who wants a lawn.

UGA Extension puts the floor for turfgrass at roughly four hours of full to filtered sun a day. Its own shade ratings place common bermudagrass at very poor and hybrid bermuda at fair to poor, while zoysiagrass rates very good to good and is described in a separate UGA bulletin as the most shade tolerant and best warm-season grass to grow beneath mature trees, holding acceptable quality down to about four to four and a half hours of filtered or intermittent sun. Tall fescue rates good for shade and is well adapted to the Piedmont, though its southern limit runs somewhere around Griffin and it struggles through an Atlanta August.

Below four hours, no turfgrass is a fair fight. That is not a failure of maintenance, it is a light budget, and the sane answer is to convert the area to a woodland bed. The shade planting guide covers how, and the grass selection guide covers where a lawn still makes sense.

The rules, which are stricter here than most people expect

Sandy Springs regulates three things a landscape project routinely touches: trees, ground disturbance, and proximity to water. All three are published on the city's own site and all three are the contractor's to handle, but knowing they exist changes how a project is scoped and how long it takes.

Trees

A tree removal permit is required for any tree measuring 18 inches diameter at breast height or larger, for any dogwood or redbud at 10 inches or larger, and for any tree inside a stream buffer or the Chattahoochee River Corridor. Where the removal is tied to construction activity, and the city names grading, pool installation, patios and additions specifically, the submittal is a Tree Conservation Plan under Division 9.3 of the Development Code rather than a simple removal permit. Dead, dying, diseased or hazardous trees are handled by sending documentation to the City Arborist for approval first. The full detail is in the tree ordinance guide.

Ground

A land disturbance permit is generally required once 1,000 square feet or more of ground will be disturbed by grading, clearing, paving or grubbing, under Article 9 of the Development Code. The city is explicit that a permit may still be needed below that threshold where the work requires erosion control measures, changes topography, or changes stormwater drainage patterns. Residential fees run to a $25 administrative fee, a $50 certificate fee, a $100 review fee and $200 per lot, plus a technology fee. A pre-construction meeting with a site inspector comes before any disturbance, and the final inspection happens only after landscape stabilisation is complete.

Water

Designated streams and water bodies carry a 75-foot stream buffer, of which the inner 50 feet must remain undisturbed and the outer 25 feet is an impervious setback where limited vegetation removal and grading may be allowed. Construction inside those areas generally requires an approved variance. Separately, properties within 2,000 feet of the banks of the Chattahoochee sit inside the state River Corridor, where a 50-foot undisturbed buffer from the bank and a 150-foot impervious surface setback restrict concrete, gravel, pavers and structures. The city enforces this on behalf of the Atlanta Regional Commission under the Metropolitan River Protection Act. The buffers guide covers what it means in practice.

Season, and why fall is the answer

UGA Extension is unambiguous that fall is the ideal time to plant most woody trees, shrubs, vines and groundcovers as well as herbaceous perennials in Georgia. Temperatures are moderate, irrigation demand is lower, and fall-planted ornamentals keep developing roots after the tops go dormant. Spring planting is not wrong, it simply hands a new plant a Georgia July before the root system is ready.

Turf runs on a different calendar. Tall fescue seeds or sods in September to October or late February to March. Warm-season grasses go down through May and June once soil temperature at four inches is consistently 65 degrees and rising, and UGA warns that dormant sodding of warm-season grasses is a riskier proposition. The planting calendar lays out the whole year.

Water, once it is on the ground

Georgia law limits outdoor irrigation for planting, growing and maintaining ground cover, trees, shrubs and other plants to the hours between 4 p.m. and 10 a.m. That schedule comes from the Water Stewardship Act of 2010 and sits in state law at O.C.G.A. 12-5-7. There are exemptions with no time limitation, including drip irrigation and soaker hoses, hand watering with an automatic cutoff or a handheld container, personal food gardens, and private wells. The one that matters most on a new project is the exemption for irrigation of new and replanted plant, seed or turf during installation and for 30 days immediately after installation. That is the establishment window, and it is written into the statute for exactly this reason.

What it costs

Landscape budgets here spread widely because the scopes are different pieces of work. Bed renovation and planting is a different trade from a geogrid-reinforced retaining wall. The cost guide puts unit rates against every scope and the budget estimator turns them into a range you can hold a quote up against before anyone walks the property.

The order the work happens in

1. Read the site. Slope, drainage path, canopy, existing tree health, and the hours of sun in leaf-on conditions.
2. Check the map. Whether a stream buffer or the river corridor touches the property, because that can move the whole layout.
3. Sort the water. Grading, swales, subsurface interception. Everything built across an uncontrolled flow path fails eventually.
4. Hold the grade. Walls and terracing, with drainage behind them rather than pressure.
5. Lay the hard surfaces. Patios, paths and steps on a properly compacted base, with fall built in.
6. Then plant. Beds prepared broadly, species chosen for the light each area receives, in the season that suits the plant.
7. Then irrigate. Zoned by exposure, on a cycle-and-soak schedule the clay can absorb.

Doing them in a different order is how a homeowner ends up paying twice, most commonly by planting a beautiful bed and then trenching a drain line through it eighteen months later.

Where the underlying data comes from

Soil properties come from the USDA Natural Resources Conservation Service Official Series Description for the Cecil series. Tree removal thresholds, land disturbance thresholds and fees, stream buffer widths and River Corridor dimensions come from the City of Sandy Springs. Turfgrass shade ratings, seeding rates and establishment windows come from UGA Extension Bulletins 1533-1, 1533-2 and 1590, and the fall planting recommendation from UGA Extension Circular 873. The outdoor watering schedule is O.C.G.A. 12-5-7, added by the Georgia Water Stewardship Act of 2010. Clay absorption rate is from Metro North Georgia Water Planning District irrigation guidance.

Cost figures across this site are our own read of the local market, written down to help with planning rather than to price anything.