1. One of the ways the yellow star thistle is costly is by reducing crop yields. The weed is a prolific competitor, and it can quickly outcompete crops for water, sunlight, and nutrients. As a result, farmers often have to spend more money on weed control in order to protect their crops.
2. California spends approximately $100 million annually to prevent the spread of the weed and remove it from infested areas.
3. It can also cause problems for livestock. The weed's sharp spines can injure animals' mouths, and the weed can also cause respiratory problems. As a result, ranchers often have to spend more money on veterinary care for their animals.
Finally, yellow star thistle can also reduce the value of land. Land that is infested with the weed is often less desirable to buyers, and it can be difficult to sell.