A Gest of Robyn Hode is one of the earliest surviving texts featuring a tale about the Robin Hood character.

In contemporary English, what is a "gren-wode shawe"?

Please consider the following excerpt:

loke ye do no husband harme
That tilleth with his plow.
No/know more ye shall no/know gode yeman
That walketh by gren-wode shawe;
Ne no knight ne no squire
That wol be a gode felawe.