Allendale County Soil Data
Allendale County, South Carolina
USDA SSURGO / PHZMAvg pH
5.0
Texture
Loamy Sand
Drainage
N/A
Organic Matter
2.7%
Hydrologic Group
N/A
Data Story
About Soil in Allendale County, South Carolina
Highly acidic soils define the region
Allendale County features an average soil pH of 4.98, which is notably more acidic than both the state average of 5.27 and the national median of 6.5. This low pH profile suggests that many local growers will need to apply lime to neutralize the soil for standard crops. Detailed taxonomic data is limited, but the acidity is a defining chemical characteristic.
Dominated by high sand content
The soil is remarkably sandy, consisting of 80.7% sand, 8.8% silt, and 8.5% clay. This composition means the soil is exceptionally easy to till and work, but it lacks the structural stability provided by clay. Water and nutrients move through this grit very quickly, which can lead to rapid drying.
Strong organic matter but low water storage
Allendale boasts a high organic matter content of 2.68%, outperforming the state average of 2.05% and the national average of 2.0%. However, its available water capacity is just 0.098 in/in, falling below the state average of 0.115 in/in. This means that while the soil is nutrient-rich, it struggles to hold onto water for long periods.
Managing drainage in the Lowcountry
Specific drainage classes and hydrologic groups are not documented for Allendale in this dataset. Given the 80.7% sand content, the soil likely exhibits rapid drainage in many areas, though local water tables can influence actual moisture levels. Gardeners should plan for frequent, light watering rather than occasional heavy soaking.
Gardening success in Zone 8b
As a Zone 8b region, Allendale is ideal for heat-loving crops like sweet potatoes and melons that thrive in sandy conditions. The high organic matter provides a great head start for any new garden beds. With a little extra irrigation, your backyard can become a highly productive southern landscape.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Hydrologic group data not available.
Drainage Class
Drainage class data not available.
Soil Profile
Dominant texture: Loamy Sand
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Acidic Soil Detected
Your county's average pH is 5.0. These products help balance soil pH for healthier grass.
Browse Soil AmendmentsFrequently Asked Questions
What type of soil does Allendale County have?
Allendale County's soil is classified as Loamy Sand. This indicates the relative proportions of sand, silt, and clay — 81% sand, 9% silt, and 9% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Allendale County's soil acidic or alkaline?
Allendale County's soil has a low pH of 5.0, which is strongly acidic. Acidic soils benefit from lime applications to raise pH and improve nutrient availability.
What is the drainage class for Allendale County?
Drainage class data is not currently available for Allendale County.
What crops or plants grow well in Allendale County's soil?
Based on Allendale County's Loamy Sand texture, pH of 5.0, and drainage class, the soil is well suited for acid-loving plants like blueberries and azaleas, row crops and vegetable gardens.
What USDA soil order is found in Allendale County?
The dominant USDA soil order for Allendale County is not currently available in our dataset.
Soil & Planting Advisory: Allendale County
Soil Verdict
Allendale County is in USDA hardiness zone 8b, a warm climate zone. where winter lows can reach 15°F. Mild winters mean soil rarely freezes deeply, allowing year-round microbial activity and faster organic matter breakdown.
Planting Guidance
Warm-season crops, citrus relatives, and heat-loving ornamentals do well. Cool-season vegetables should be planted in fall and winter. Always match plant selections to the specific microclimate of your property — low spots, slopes, and wind exposure can shift effective hardiness by half a zone.
Soil Implications
Warm soils accelerate organic matter breakdown, so compost and mulch need replenishing more frequently than in cooler zones. Sandy soils common in warm zones drain quickly; water-retentive amendments like compost or peat help hold moisture.
Regional Context
Allendale County closely matches the South Carolina average hardiness conditions.
Planning your lawn? View lawn care data for Allendale County on LawnByCounty.com →
Other Counties in South Carolina
Soil data sourced from USDA SSURGO via Soil Data Access. Data is informational only and should not be used as a substitute for on-site soil testing. Contact your local NRCS office for site-specific soil information.