The sedge is one of the loveliest textured stitches in crochet in my opinion.
Yet, it is really difficult to find good charts - especially for increases and decreases.
If you are a beginner, you will be able to make this by using some basic stitches: chains (CH), single crochet (SC), half double crochet (HDC) and double crochet (DC). I'm using the American terms.
A cluster is a SC, HDC and DC placed into a single stitch.
Foundation chain
The foundation chain for a Sedge Stitch is a multiple of 3 plus 2 chains (this is a repeat pattern of 3, you need 1 extra for a final stitch after the repeat - and another chain for the turn).
Row 1
In 2nd chain from hook, place a single crochet(sc), a half double crochet (HDC) and a double crochet (DC) into the same stitch. Skip 2 chains.
Continue to repeat this pattern ((SC, HDC, DC), skip 2) until you reach the last chain where you will place just a single crochet (SC).
Row 2
Chain 1 (CH 1) and turn your work.
In the final CS of the last row (1st stitch), place (SC, HDC, DC). Skip two stitches and work (SC, HDC, DC) into the next stitch - repeat this until the last stitch where you place a single crochet.
3++
Repeat by doing row 2 as many times as you want: CH1 and turn, ((SC, HDC, DC), Skip 2) until you reach the final stitch space, SC) - done!