The Cost of Growing Weed in Different States When we talk about growing weed, most of us don’t know the exact price of growing weed. So, I thought of sharing with you guys the cost of growing weed in different states. It is the most common question that comes in the mind of most of the people when they talk about growing weed. Let me tell you that you will get different prices for growing weed depending on the location of the weed farm. California If you are planning to grow weed in California then you can expect to pay $5000 to $15000 for a single plant.