The Tool Desk
Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →Loam is a soil texture class: a mineral soil made from a mixture of sand, silt, and clay, with the proportions of those three particle groups deciding whether a soil is classed as loam. It describes particle size, not quality. A loam can still be low in nutrients, poorly drained, or compacted, and a dark, crumbly soil is not automatically loam.
What loam is made of
Sand, silt, and clay are mineral particle groups separated by size. The USDA Natural Resources Conservation Service (NRCS) gives the following diameter ranges in its Soil Factors Handouts:
| Particle group | Diameter (NRCS range) |
|---|---|
| Sand | 2.0 to 0.05 mm |
| Silt | 0.050 to 0.002 mm |
| Clay | 0.002 mm or smaller |
Loam combines all three groups. Its class comes from the measured proportions of sand, silt, and clay, not from the word on a product label. The NRCS handout states the principle in one sentence: “Loam is a combination of sand, silt, and clay.” (USDA NRCS, Soil Factors Handouts)
Particle-size definitions can change with the classification context. The USDA APHIS table of soil textures and particle sizes (drawing on Soil Science Society of America definitions, 2011) cautions against substituting a family particle-size class for the familiar textural class, so keep the two separate when reading technical references. (USDA APHIS, Table III-47)
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- Ready-to-Use for All Planting Needs: This general-purpose potting soil is ready to use out of the bag, perfect for both indoor and outdoor planting without any extra prep
- Optimal Moisture Retention and Drainage: Designed to let excess water drain effectively while retaining moisture, promoting healthy plant growth in the garden or lawn
- Top Soil Blend: Features a dark blend of reed sedge peat and sand, offering the best conditions for grass, vegetables, and plant root health in raised beds
- Perfect for All Gardeners: Developed for both new and experienced home gardeners, this soil mix enhances plant growth in a variety of environments and garden projects
- Improves Soil Quality: Ideal for loosening heavy clay soil and enhancing moisture in light soil, making it perfect as a top dressing to fill holes in lawns and garden beds
How the texture class is determined
There is no single recipe for loam. Texture classes are assigned from the proportions of sand, silt, and clay plotted on a soil-texture triangle. If you know the percentages, use a valid classification chart or calculator rather than estimating by eye.
- Obtain the sand, silt, and clay percentages from a laboratory report or a texture test kit.
- Enter the three values into the NRCS Soil Texture Calculator, which classifies a point from known percentages.
- Read the class the calculator returns, and check it against the texture triangle if you are working from a published chart.
A home texture test kit can estimate the texture class, but the sources used for this guide do not establish how accurate any particular consumer kit is, so treat a kit result as an estimate. (USDA NRCS, Soil Texture Calculator; USDA NRCS, Soil Quality Test Kit Guide)
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- GROWTH STARTS HERE: With a blend of aged forest products, sandy loam, and sphagnum peat moss, this seedling potting soil supports aeration and drainage. It’s designed to use right out of the bag
- FUEL FOR GROWING SUCCESS: Packed with fish meal, crab meal, and earthworm castings, this potting soil supports seedlings and plant starts with the nutrients they need to flourish. Get your plants off to a strong start with this blend
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- EASY PLANTING INSTRUCTIONS: Fill the container with soil 1 inch (2.5 cm) below the top edge of the pot. Water thoroughly after planting. For best results, feed your plants with Fox Farm potting soil during growth and bloom seasons
What texture changes in practice
The USDA soil-quality guidance says texture influences fertility and helps determine four things: water intake, water storage, ease of tillage, and aeration. It gives a clear contrast: clay soils retain more water and nutrients than sandy soils. Loam is best understood as a balance among these behaviours, not as a guarantee of any one of them.
- Water intake and storage: texture governs how quickly water enters the soil and how much it holds.
- Tillage: texture affects how easily the soil can be worked.
- Aeration: texture affects the air spaces available to roots.
(USDA NRCS, Soil Quality Test Kit Guide)
What a loam label does not tell you
A texture result is not a complete soil diagnosis. The cited texture material addresses particle proportions and texture-related behaviour only. It does not tell you whether a soil suits a particular plant on these points:
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Rank #3
- Ready-to-Use for All Planting Needs: This general-purpose potting mix is ready to use out of the bag, making it perfect for both indoor and outdoor planting without any additional preparation
- Optimal Moisture Retention & Drainage: Designed to allow excess water to drain effectively while retaining moisture, promoting healthy plant growth during dry seasons
- Soil Blend: Features a dark blend of reed sedge peat and sand, offering the best conditions for plant health and soil structure
- Perfect for All Gardeners: Developed for both new and experienced home gardeners, this soil mix enhances plant growth in various environments and gardening projects
- Improves Soil Quality: Ideal for loosening heavy clay soils and enhancing moisture in light soils, making it perfect for use as a top dressing to fill holes in lawns and garden beds
- pH
- nutrient levels
- drainage at a specific site
- organic matter content
Test for those separately if they matter to your project. Soil structure and plant requirements are also separate considerations.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Loam in the retail market
The USDA NRCS Soil Judging Manual distinguishes the technical texture meaning of loam from the “loam” that landscapers sell for lawns and gardens. (USDA NRCS, Soil Judging Manual) A bag or bulk delivery labelled loam may not match the technical class. Read the product description and composition, and do not assume that the label confirms a particular sand, silt, and clay balance.
Quick Recap
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- RETAINS MOISTURE: Sustainable coconut coir helps hold the right amount of water for potted plants, indoors or outdoors. Coconut coir is an organic and sustainable resource that helps maintain moisture between waterings.
- TIP FOR FLOWER POTS: Use flowers and foliage of varying heights to add dimension to your container. Place tall plants in the middle or back, mounding plants all around and spilling plants at the edge.
- Since 1876: Generations of customers have trusted Burpee to deliver the highest quality products and service. Gardeners rely on Burpee for accurate plant information and how-to tips that make gardening easier and more successful. Let’s grow together!
Rank #4
- High-Quality Topsoil Blend: Crafted with a mix of reed, sedge, peat, and sand, this loam-like soil provides a strong environment for strong, healthy black dirt plant growth in your yard or any raised bed soil
- Ideal for Lawns & Garden Beds: Top Soil helps maintain the balance of moisture, organic nutrients, and microbes, for top-dressing lawns, planting beds, and transplant mixtures for shrubs and trees
- Effortless & Convenient: Ready-to-use bulk soil is meticulously screened and expertly formulated to loosen heavy garden soil, providing a simple fill dirt, lawn soil outdoor, and lawn leveling mix before grass seed goes down
- Water Retention for Lush Growth: Provides consistent water for outdoor plants, ensuring your lawn, garden, and other greenery stay lush and healthy all year long
- Large, 50-Pound Bag: Convenient, easy large bags sized of 11"L x 6"W x 17"H, offering a total weight of 50 lbs of premium topsoil with horticultural sand and peat moss for plenty of coverage
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
