Polk County Soil Data
Polk County, Florida
Avg pH
5.5
Texture
Sand
Drainage
N/A
Organic Matter
5.7%
Hydrologic Group
N/A
Data Story
About Soil in Polk County, Florida
The Most Neutral Soil in the Region
Polk County has an average pH of 5.46, making it one of the least acidic counties in Florida compared to the state average of 4.88. While still more acidic than the national median of 6.5, it offers a more flexible environment for various crops. This slightly higher pH is likely why the region has historically been a citrus powerhouse.
Sand-Heavy Mix for Deep Roots
With 88.2% sand, Polk has one of the highest sand concentrations in the state. Silt and clay make up just 2.4% and 5.2% respectively, creating a very porous soil structure. This composition allows for deep root penetration but necessitates consistent irrigation and fertilization.
Lower Organic Matter for Florida
Organic matter in Polk County stands at 5.72%, which is higher than the national 2.0% but lower than the Florida average of 8.03%. Correspondingly, the available water capacity is 0.099 in/in, which is below the state average. Gardeners should prioritize adding compost to improve the soil's ability to hold water.
Rapid Throughput and Inland Drainage
Specific drainage class data is missing, but the 88.2% sand content usually indicates rapid to very rapid drainage. The soil is likely to dry out quickly after storms, which prevents root rot but can stress plants during dry weeks. These characteristics are ideal for building foundations but challenging for water-hungry crops.
Citrus and Sun in Zone 10a
Polk County is situated in Zone 10a, perfectly suited for the citrus trees that made the region famous. Peaches and blueberries also do well here if you manage the water levels. The long growing season and manageable pH make this an excellent place to start a home orchard.
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: Sand
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Polk County have?
Polk County's soil is classified as Sand. This indicates the relative proportions of sand, silt, and clay — 88% sand, 2% silt, and 5% clay. Sandy soils drain quickly but may need more frequent irrigation and fertilization.
Is Polk County's soil acidic or alkaline?
Polk County's soil has a low pH of 5.5, which is strongly acidic. Acidic soils benefit from lime applications to raise pH and improve nutrient availability.
What is the drainage class for Polk County?
Drainage class data is not currently available for Polk County.
What crops or plants grow well in Polk County's soil?
Based on Polk County's Sand texture, pH of 5.5, and drainage class, the soil is well suited for acid-loving plants like blueberries and azaleas, drought-tolerant crops, root vegetables, and sandy-soil specialists.
What USDA soil order is found in Polk County?
The dominant USDA soil order for Polk County is not currently available in our dataset.
Planning your lawn? View lawn care data for Polk County on LawnByCounty.com →
Other Counties in Florida
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.