A program was started in 2008 to get rid of 24 nonnative invasive plant species from Santa Cruz Island in California. By 2012, 882 populations of these plants were treated, with 73% of them now dead. The remaining active infestations are mostly due to seeds in the soil. Using a small helicopter helped survey and treat remote areas efficiently. The key to success is consistent treatment every year to stop the plants from coming back. Some plants have seeds that can stay in the soil for a long time, so managing them will be a challenge for years to come.