Monkton Elm near Taunton heard about the theft at Wedmore First School on BBC Radio Somerset and offered the trees as replacements.
Teacher Andy Wookey said: "Sadly, 26 of 30 trees donated by the Woodland Trust last November were stolen in February."
He added that the school was establishing a wildlife area and moving and enlarging the Wedmore school garden. The new trees include oak, ash and beech.
Monkton Elm plant manager Andrew Pitman said his firm had given away groups of between 50 or 100 small indigenous British saplings to 25 schools and organisations.