According to AMG, "Greenin' Up" is included in David Mallett's 1999 album "Ambition," Flying Fish #674.

Here's a quote from a review:

Mallett's strength is being able to hold two ideas, two emotions at the same time. In "Greenin' Up" he returns to the garden farm, but instead of the careful cultivation that made the "Garden Song" a hit with the "Tzena Tzena" crowd, this gardener is content - at least for the moment - to leave the world alone. The horse past its prime, the bullfrog in a swamp of "fiddleheads and rotten wood," the seeds of "Every little weed / Every little vine." More than the lure of the idle fishing tackle, it's the realization that, without any help from him, "it's springtime in the country / And the pasture grass is greenin' up real good."