The first of the two grassy knolls is stitched on Eve in the Garden.
This is actually a raised stitch which is worked over a rod--or, in the 21st century, a very small sock needle. Obviously, after you work the stitches, you carefully slide the needle out, which ruffles up the stitches just a wee bit, but makes them look grassier--if that's a word.
It does help if you know where the needle is. It came with the original kit. But one of the problems with letting things age in ones stash is that sometimes things go walkabout, and my needle did. Luckily I also knit socks on occasion, and I have a plethora of knitting needles of all types and sizes, so I was able to find the right size.
I just have to remember to put that needle back with the pair of socks I'm working on when I get through planting grass. Otherwise, in three or four years when I have another mad desire to make the rest of the sock, I'll be in trouble on that front.