Mont. Code § 71-3-701
A person, company, association, or corporation that furnishes to another seed to be sown or planted or funds or means with which to purchase seed to be sown or planted or to be used in the production or cultivation of a crop or crops on the lands owned or contracted to be purchased, used, leased, occupied, or rented by the other person or held under government entry, upon filing the statement provided for in 71-3-703, has a lien not exceeding the purchase price of the seed or grain furnished upon the crop produced from the seed or grain furnished, or any part of the crop, and upon the seed or grain threshed from the crop to secure the payment of the amount or the value of the seed or grain furnished or the funds or means advanced to purchase the seed or grain.
§ 71-3-701, MCA