Natural Resorces

Soil testing

Our soil testing flyer (PDF) will explain how to take the sample and where to take it for processing. 

We offer three convenient locations in the St Louis Area to bring your samples to have them tested by our lab.

When preparing your samples please keep in mind:

  1. Please DRY your sample before submitting! Leave soil sit out overnight on a tray with newspaper or other paper source. 
    If your sample is too wet when brought into the office, it will go through the drying process before being packaged for shipment.
  2. Pull samples from various areas of your lawn or garden, even if they are tilled. One big sample from just one area of the yard/garden, will not give you accurate results.
  3. Submit at least 1-1/2 to 2 cups of soil. Usually a sandwich bag or quart size storage bag filled, will suffice.
  4. It takes 10-14 business days for results to be returned. If the soil is wet, add a few extra days.
  5. Also, please keep in mind that the lab is extremely busy during the months of February, March, April, May and June.


MU Extension,
St Louis County (Kirkwood)

132 E. Monroe Ave
Kirkwood, MO 63122
M-F 8:30-4:30  

Brightside St. Louis
4646 Shenandoah Ave.
St. Louis, MO 63110
M-F 9:00-4:00
Gateway Greening
2211 Washington Ave.
St. Louis, MO 63103
M-Th 8:00-3:30

Please note:  Brightside and Gateway Greening only
accept samples for Lawns or Home Gardens. Commercially
grown or Field Crop samples should be taken to the Extension Center in Kirkwood.

Not in the St Louis Metropolitan area?  Every county has a local extension to take your samples to. To find your local office, click here.

Soil sample instructional video

Watch Nathan Brandt demonstrate the proper way to collect a soil sample.

Did you have your soil tested?

Free web app helps homeowners buy and apply right amounts of fertilizer. Learn more about it here.

Just need the calculator? Click here

How to determine what your lawn needs from your results. Get the "Soil Testing for Lawns" publication here.

Chinch bugs in zoysia lawns

It is not uncommon to come across 30+ year-old zoysia lawns in St. Louis. They are resilient and require comparatively little care. That’s why many homeowners are caught off guard by large areas that rapidly turn brown and die out in a matter of weeks. It is unclear why lawns without a history of chinch bug damage suddenly become infested. Read the article from Nathan Brandt by clicking here!

Brown Patch

Brown patch is an increasing problem for lawns with the rain that we are getting in the St. Louis area. Nathan Brandt discusses brown patch in Post-Dispatch article on June 25, 2015.   

Lead in urban soils

Nathan Brandt discusses the importance of testing for lead in urban gardens.

MU Extension St. Louis County: Lead in Urban Soils from MU Extension St. Louis on Vimeo


Watch Nathan Brandt address the issue of fireblight in the metro area.

MU Extension St. Louis County: Fireblight from MU Extension St. Louis on Vimeo.

St. Louis Master Gardeners

St. Louis Master Gardeners are trained volunteers who enjoying sharing their gardening knowledge with others.

St. Louis Master Gardeners at work

The St. Louis Master Gardeners were hard at work beautifying the grounds at the Kathy J. Weinman Shelter. The volunteers are transforming the space to provide some comfort for the women and children residing within the facility. This is one example of the partnership MU Extension has with St. Louis County. This began with a phone call requesting help with a flower bed. Do you have community horticulture project that you would like help with? Give Nathan a call: 314-400-7338!

Like us on  Find us on Facebook Facebook
Follow us on  Find us on Twitter Twitter