1. Land lease fee: Land lease fee is one of the main costs of planting milk thistle, which varies according to geographical location, land quality, lease term and other factors, ranging from several hundred yuan to several thousand yuan per mu every year.

2. Seed cost: the price of Silybum marianum seeds is relatively high, and it needs 1 to 2 kg of seeds per mu. Seed cost is also an important expense for planting milk thistle. The price of seeds ranges from tens to hundreds of yuan per kilogram, and the specific price varies according to factors such as seed quality and origin.

3. Fertilizer cost: appropriate amount of fertilizer, including nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer. It is necessary for the good growth of Silybum marianum. The types and dosage of fertilizers vary with soil quality, climatic conditions, fertilizer quality and other factors. The fertilizer cost of milk thistle per mu ranges from several hundred yuan to several thousand yuan.

4. Pesticide cost: In order to control pests and ensure the growth and yield of Silybum marianum, it is necessary to use appropriate amount of pesticides. The types and dosage of pesticides vary according to the types of pests and diseases, climatic conditions and other factors, and the pesticide cost of milk thistle varies from several hundred yuan to several thousand yuan per mu.

5. Labor costs: Planting Silybum marianum requires certain labor costs, including planting, fertilizing, spraying and harvesting. The labor cost varies with regional labor price, planting scale and other factors. The labor cost of milk thistle varies from several hundred yuan to several thousand yuan per mu.

6. Other expenses: In addition to the above expenses, other expenses need to be considered, such as irrigation expenses, transportation expenses, processing expenses, etc.