Efforts to plant millions of trees across America may be the latest victim to the logjam on immigration policy. Temporary foreign workers plant the great majority of trees in the U.S., including in national forests, and limitations on how many workers can enter the country through the H-2B visa guest worker program raise serious doubts about whether ramped-up reforestation goals can be met… “The need is huge right now,” said Tim O’Hara, vice president for government affairs at the Forest Resources Association. Workers in the U.S. on H-2B visas — which are for temporary, nonagricultural workers — make up about 85 percent of tree-planting jobs… They plant around 1.5 billion trees a year, according to the association. Contractors who plant trees typically seek around 11,000 workers each season but were looking for as many as 14,000 last year… About 10 percent of all H-2B visas in the U.S. go to forest workers, according to the group.