Quick verdict
A calibrated jar, a 12-page handbook and an online calculator that turn the classic jar test into a measured result: shake soil in water, let the layers settle and read the sand, silt and clay percentages off the calibration marks. Texture decides how soil drains, holds water and takes amendments, and this kit makes it a 24-hour test anyone can run. It does not test nutrients or pH.
Strengths
- Calibrated jar makes the layer measurements accurate and repeatable
- Twelve-page colour handbook explains soil texture and how to amend it
- Free online calculator identifies the soil type from your layer readings
- Reveals why a bed drains badly or dries fast
- Reusable; test as many spots as you like
Weaknesses
- Texture only; no pH or nutrient tests
- Full settling takes a day or more for clay soils
- It is a jar and a book, so the price is for the method rather than materials
The overall YardToolLab Score is out of 100. Section scores are out of 10.
The Soil Fact Nobody Tests
Gardeners test pH and nutrients and skip texture, yet texture decides whether a bed drains, how often it needs water and how it responds to compost. The old jar test, soil shaken in water and left to settle into layers, reveals it. Garden Tutor’s kit refines that with a calibrated jar, a 12-page handbook and an online calculator so the layers become real percentages and a named soil type.
This review is based on Garden Tutor’s specifications and on how sedimentation texture tests work generally. We have not run this kit ourselves.
How It Works
Fill the jar to the mark with sieved soil, add water and a little dispersant as instructed, shake hard and set it down. Sand settles in about a minute, silt over a few hours and clay over a day or more. Read each layer’s depth against the calibration, enter the numbers in the free calculator and it names the texture: sandy loam, clay loam, silt and so on.
What You Learn
A sandy soil drains fast, dries fast and loses fertiliser; it wants organic matter. A clay soil holds water and nutrients but drains slowly and compacts; it wants organic matter and patience, not sand. A loam is the goal. The handbook explains each type and the amendments that help, which is the part most jar-test instructions leave out.
Accuracy
The calibrated jar removes most of the guesswork from measuring thin layers, and repeating the test on soil from several spots gives a reliable picture of a bed. It will not match a laboratory hydrometer analysis, but it does not need to.
Time
Sand and silt read within hours; clay takes a day or longer to settle fully. Set the jar on a windowsill and read it the next day.
Who Should Buy It
- New gardeners trying to understand why beds behave as they do.
- Anyone planning drainage or irrigation who needs to know how the soil holds water.
- Raised bed builders checking a soil mix before filling.
Common Owner Complaints
The wait for clay to settle and the feeling that a jar and a book should cost less. The method and the handbook are what you pay for.
Alternatives to Consider
A mason jar and a ruler do the test roughly for free. A university extension lab provides a full texture analysis with nutrients for a fee. The Luster Leaf Rapitest covers pH and nutrients, which this kit does not.
Verdict
For understanding the soil you have, the Garden Tutor kit turns a folk method into a measured, explained result for the price of a few seed packets. Run it once per bed and the handbook will tell you what to do next.
Full specifications
Garden Tutor Soil Texture Test Kit with Calibrated Jar and Handbook FAQs
The proportions of sand, silt and clay determine drainage, water holding, how fast fertiliser leaches and how easily roots penetrate. Knowing your texture tells you whether to add organic matter, grit or nothing.
Soil shaken in water settles in order: sand within a minute, silt within hours, clay over a day. The depth of each layer against the calibration gives the percentages.
You can, but measuring thin layers in an unmarked jar is guesswork. The calibration and the calculator turn it into a usable number.
The handbook explains amendments for each texture and the calculator names your soil type, so yes, in general terms.
