Free trees

I walked into town this morning and passed this stall on the way.  Free trees; encouraging people to take and plant them, preferably in the wild but I'm sure they wouldn't complain if one went in the garden.  They are all native species grown from locally collected seeds, so good for the local area.  I've noticed before that the garden had lots of small hedging plants ready to be planted and at first thought they were having a garden makeover, but they would seem to be professionals of some sort; growers or landscape gardeners, perhaps?