A lab soil test can report pH and nutrients and may include recommendations for a lawn or garden. For the Iowa State Extension example, collect 10 to 15 small samples from one similarly managed area and mix them, but use the chosen lab’s own depth and submission instructions. Keep lawn, vegetable beds and differently managed areas separate so the sample represents the ground you plan to amend.
Test the area you plan to manage before adding soil amendments or fertilizer. A laboratory report can give measured values for soil pH and nutrients, with recommendations for a lawn or garden. The sample needs to represent one area, so keep separately managed spaces apart.
Compare a home kit with a laboratory test
| Option | What to compare |
|---|---|
| Home kit | Which nutrients or conditions it measures, how results are shown, its method and whether its instructions match your soil. Some kits use broad categories or color comparisons. |
| Laboratory test | Which values it reports, whether recommendations are specific to lawns or gardens, how to collect the sample and how results are returned. |
Iowa State Extension notes that home kits vary in the number of conditions measured and may report broad categories, while laboratory tests can provide measured values and recommendations. Services and methods differ, so choose a lab whose report covers the site you want to improve.
Collect separate, representative samples
First divide the property into areas that are managed differently. For example, sample the lawn separately from a vegetable garden, and keep beds apart if they receive different fertilizers or amendments. Remove surface litter and follow the testing lab’s instructions for tool, depth, sample quantity and packaging.
As one regional example, Iowa State Extension recommends combining small samples from 10 to 15 locations in a similarly managed area, using soil from the top 4 to 8 inches. Those instructions are specific to the source’s home-garden guidance; other laboratories can require a different depth or amount.
When the report arrives, follow its recommendations for the plant type and region. See when to fertilize your lawn, how to start a vegetable garden, and the raised bed soil calculator. For garden watering plans, read the irrigation guide and browse gardening.
Sources
Checked November 5, 2026.
Common questions
Should I test garden soil before adding fertilizer?
A soil test can help identify pH or nutrient needs before you choose amendments. Follow the lab’s recommendations and your state extension guidance instead of applying products based on a general lawn or garden schedule.
Can I use one soil sample for my lawn and vegetable garden?
Usually take separate samples when areas are managed differently. Iowa State Extension advises testing a lawn, vegetable garden and separately managed beds as distinct areas.
How do I collect a soil sample?
Follow the chosen lab’s directions for depth, quantity and packaging. Iowa State Extension’s home-garden guidance uses 10 to 15 subsamples from the top 4 to 8 inches for a representative area.
Is a home soil test kit enough?
A home kit can screen for selected conditions, but Iowa State Extension notes that kits vary in what they measure and how results are reported. A lab may be more useful when you need measured values and recommendations for your region.