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Switchgrass is a hardy, deep-rooted, perennial rhizomatous grass that begins growth in late spring.It can grow up to 2.7 m (8 ft 10 in) high, but is typically shorter than big bluestem grass or indiangrass.
In 1993, the OTA estimated that a total of $100 million is invested annually in invasive species aquatic weed control in the U.S. [19] Introduced rats cause more than $19 billion per year in damages, [20] exotic fish cause up to $5.4 billion annually, and the total costs of introduced weeds are estimated at around $27 billion annually. [21]
The economic impact of kudzu in the United States is estimated at $100 million to $500 million lost per year in forest productivity. [7] In addition, it takes about $5,000 per hectare ($2,000/acre) per year to control kudzu. [7] Power companies must spend about $1.5 million per year to repair damage to power lines.
Exotic species control falls under the management of the U.S. Fish and Wildlife Service, which has been compiling and disseminating information about invasive species since 1994. Control of invasive species costs $500 million a year, but 1,700,000 acres (6,900 km 2) of land in South Florida remains infested. [5]