Baltimore city Soil Data
Baltimore city, Maryland
Avg pH
3.6
Texture
Silt loam
Drainage
Well drained
Organic Matter
1.4%
Hydrologic Group
C
Data Story
About Soil in Baltimore city, Maryland
Extreme Acidity in Urban Alfisols
Baltimore City soils are notably acidic, with a pH of 3.60 that sits dramatically below both the national median of 6.5 and the state average of 5.31. These are classified as Alfisols, which are typically found under forest cover and are characterized by a clay-enriched sublayer. This unique chemical profile presents a challenge for traditional gardening without significant amendment.
The Silt Loam of the City
The dominant texture is silt loam, created by a mix of 32.2% sand and 27.4% silt. With 11.7% clay, the soil is physically workable but has a fine, dusty consistency when dry. This texture is generally good for root penetration but can be prone to compaction in high-traffic urban areas.
Low Organic Matter and Capacity
Organic matter levels are quite low at 1.43%, trailing the state average of 9.10% significantly. The available water capacity is 0.117 in/in, meaning the soil does not hold onto moisture as effectively as the average Maryland soil at 0.175. Urban gardeners should focus on adding compost and mulch to build up these thin soil profiles.
Well Drained but Runoff Prone
The soil is classified as well drained, yet it falls into hydrologic group C, indicating a slow rate of water transmission. In a city setting, this means that heavy rains can lead to quick saturation and surface runoff. Proper drainage design is essential for urban farms and landscape projects to prevent erosion.
Resilient Growing in Zone 7b
Baltimore's Zone 7b climate allows for a wide range of hardy vegetables and perennials. Because of the high acidity and low organic matter, raised beds with imported soil are the most successful way to start an urban garden. You can grow vibrant greens and herbs while transforming the city's landscape one plot at a time.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group C — Moderate-High Runoff
Soils with slow infiltration rates, often with a layer that impedes downward water movement. Higher clay content restricts drainage.
Drainage Class
Well drained
Water is removed from the soil readily but not rapidly. Optimal for most plants and construction.
Soil Profile
Dominant texture: Silt loam
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does Baltimore city have?
Baltimore city's soil is classified as Silt loam. This indicates the relative proportions of sand, silt, and clay — 32% sand, 27% silt, and 12% clay. Loamy soils hold moisture well and support a wide range of plants.
Is Baltimore city's soil acidic or alkaline?
Baltimore city's soil has a low pH of 3.6, which is strongly acidic. Acidic soils benefit from lime applications to raise pH and improve nutrient availability.
What is the drainage class for Baltimore city?
Baltimore city has a dominant drainage class of "Well drained." Well-drained soils allow excess water to move through quickly, reducing waterlogging risk and supporting most field and garden crops.
What crops or plants grow well in Baltimore city's soil?
Based on Baltimore city's Silt loam texture, pH of 3.6, and Well drained, the soil is well suited for acid-loving plants like blueberries and azaleas, row crops and vegetable gardens, most annual and perennial crops.
What USDA soil order is found in Baltimore city?
Baltimore city's dominant soil order is Alfisols. Alfisols are moderate to high base-status soils with a clay-enriched subsoil. They support productive forests and cropland across temperate regions.
Planning your lawn? View lawn care data for Baltimore city on LawnByCounty.com →
Other Counties in Maryland
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.