Soil falls in Class 1, industrial chemicals, and depending on what exactly you sell it can also fall in Class 42 or Class 19 or Class 44. Everything below is read from the USPTO's own list of accepted descriptions, not from an opinion about where it belongs.
Searching the USPTO Trademark ID Manual for soil returns 67 accepted descriptions, and most of them sit in Class 1. The manual is the list of identifications the office has already approved, so wording taken from it is pre-approved and settles the class at the same time.
The class follows from the identification you write, so "what class am I in" is really "what exactly do you sell". How the class system works covers the rest.
Raw chemicals, adhesives, or additives used in industry, science, farming, or manufacturing.
34 accepted descriptions in the manual mention soil. For example:
Software as a service (SaaS), app development, IT, design, or science and engineering services.
6 accepted descriptions in the manual mention soil. For example:
Non-metal building materials like lumber, stone, concrete, or glass.
3 accepted descriptions in the manual mention soil. For example:
Medical, dental, veterinary, wellness, beauty, grooming, or landscaping services.
3 accepted descriptions in the manual mention soil. For example:
Soil appears in 4 classes because what you make, what it is made of and the service of selling it are separate classes. Pick the descriptions above that match what you actually do.
Making soil is Class 1; a shop or online store that sells it is retail store services (Class 35), and a business that does both files in both.
Raw and industrial chemicals, fertilizers included. A substance moves class once it is made up for an end use: paints are Class 2, cleaning preparations are Class 3 and pharmaceutical preparations are Class 5. Plastics follow the same logic: unprocessed plastics are here and semi-processed plastics are Class 17.
The class decides what a registration covers; it does not decide whether the name is available. Relatedness is judged on the identifications, so a conflict can sit in a class you never looked at: the same name in a different industry.
Check whether your name is clear for soil Searches the live USPTO register, including sound-alike and meaning-alike names. First search $2, then $5.Soil sits in Class 1, industrial chemicals. That is where the USPTO's own ID Manual puts it: 34 accepted descriptions mentioning soil fall in Class 1. Depending on exactly what you sell it can also fall in Class 42 or Class 19 or Class 44.
You file in every class you actually use the mark in, and the USPTO charges its fee per class. Selling a product and also running an online store for it is two classes, not one. Filing in classes you do not use is worse than filing in too few: an application has to be supported by real use or a genuine intent to use.
No. The class decides what a registration covers. Availability turns on whether someone already holds a similar mark for related goods, and relatedness is judged on what the identifications say rather than on the class number, so marks in different classes can still conflict.
Not what you sell? Search the class finder for your own wording, or browse all 45 classes.