Jamieson, Fausset and Brown on Song of Solomon 6:11

11. The bride's words; for she everywhere is the narrator, and often soliloquizes, which He never does. The first garden (So 2:11-13) was that of spring, full of flowers and grapes not yet ripe; the second, autumn, with spices (which are always connected with the person of Jesus Christ), and nothing unripe (So 4:13, &c.). The third here, of "nuts," from the previous autumn; the end of winter, and verge of spring; the Church in the upper room (Ac 1:13, &c.), when one dispensation was just closed, the other not yet begun; the hard shell of the old needing to be broken, and its inner sweet kernel extracted [Origen] (Lu 24:27, 32); waiting for the Holy Ghost to usher in spiritual spring. The walnut is meant, with a bitter outer husk, a hard shell, and sweet kernel. So the Word is distasteful to the careless; when awakened, the sinner finds the letter hard, until the Holy Ghost reveals the sweet inner spirit.

fruits of the Valley--Maurer translates, "the blooming products of the river," that is, the plants growing on the margin of the river flowing through the garden. She goes to watch the first sproutings of the various plants.