Willow Grove-based tree removal ­company Asplundh must pay $95 million to the ­federal government after admitting to ­employing undocumented immigrants, prosecutors announced Thursday.

The penalty is the largest ever in an ­immigration-related case, according to the U.S. Attorney’s Office for the Eastern District of Pennsylvania. As part of Asplundh’s guilty plea, the company must pay $80 million in criminal forfeiture to the government as well as an additional $15 million to satisfy civil claims for ­failure to comply with immigration law.