Growing In-Ground Means Working with Your Actual Soil

In-ground growing means your plants interact directly with native soil. Unlike raised beds or containers, there is no imported growing medium to buffer against local conditions. Every soil property — pH, drainage, texture, organic matter, depth to bedrock — directly shapes what will thrive.

This is not a limitation. It is a starting point. Many native soils across the United States are already well-suited for productive gardens. The USDA Natural Resources Conservation Service has mapped and laboratory-tested soils nationwide through the SSURGO program, and a large share of mapped soil units fall within the optimal range for common vegetables and fruit trees.

The question is not whether your soil is "good enough." The question is: what does your specific soil support, and what would it take to expand that range?

SSURGO (Soil Survey Geographic Database) is the most detailed soil survey published by the USDA. It maps soil types at the field level, with each mapped area — called a "map unit" — carrying laboratory-tested properties collected by NRCS soil scientists who walked the ground and sampled the soil.

When Growable Ground analyzes your parcel, we query SSURGO for the specific map units that intersect your property boundary. This gives you three properties critical for in-ground growing:

Two neighbors on the same street can have completely different soil map units — and completely different growing potential. That is why a parcel-level read matters more than ZIP-code generalizations.

When native soil properties fall outside the optimal range for your target crops, amendments can shift conditions over time. The right amendment depends on what your soil actually needs — which is why knowing your SSURGO properties first matters.

• Low pH (acidic soil): Agricultural lime (calcium carbonate) raises pH gradually over several months. The amount required depends on both current pH and soil texture — clay soils buffer more heavily than sandy soils, requiring larger applications per unit of pH change.
• High pH (alkaline soil): Elemental sulfur lowers pH as soil bacteria convert it to sulfuric acid. This is a slow process — plan for 6-12 months before significant change. Sulfur application rates also depend on soil texture.
• Low organic matter: Compost is the one amendment nearly every soil benefits from — it adds organic matter, holds water in sandy soils, and opens up drainage in clay soils. The NRCS Soil Survey Handbook documents organic matter content per soil map unit — your report shows whether your soil is already adequate or would benefit from amendment.

Not every soil needs amending. The common misconception that "all soil needs to be replaced before planting" is exactly that — a misconception. Many native soils are already productive for a wide range of species. The point of data is to tell you which category your parcel falls into before you spend money on amendments you may not need.

Pro Tip

Start with a soil test before buying amendments. Your Growable Ground report shows your SSURGO soil data — know what you're working with before you change it.

This is the difference between in-ground and a raised bed: in the ground, the soil is not negotiable, so its properties count for everything. When Growable Ground scores 1,086 plants for an in-ground bed, a pH mismatch, poor drainage, or a contamination flag pulls a plant's suitability down in full — because those are the exact conditions the plant will live in. Raised-bed and container scoring relax the soil constraints; in-ground scoring holds them, alongside your PRISM climate normals, sun hours, and frost dates. It reflects reality: your plants grow in this soil, so this soil has to support them.