Whether knitting or crocheting, the seed stitch creates a neat bumpy look to accent your project.
The crochet technique for making a seed stitch is usually based on alternating a single crochet with a double crochet, which creates a strong, dense looking pattern. My variation is created by alternating a half double crochet stitch and a treble crochet stitch. This gives a more open look to your crochet design pattern. Of course, type of yarn used and size of crochet hook will make different looks too.
For my sample, I used a Size H crochet hook and 100% cotton yarn. You want to begin by chain stitching an odd number of chains, (I chained 21 stitches in sample). Now make a HDC (half double crochet) in the 2nd chain from hook. In the next chain, make a TR (treble crochet), in next chain make a HDC, next chain a TR and so forth until to get to the end of your chain stitches. If you started your first row with a HDC, you will end with a TR crochet and have 20 stitches in your row.
Turn, make a SL stitch in first stitch, CH 1 (counts as your first HDC), then continue in pattern – TR, HDC, TR, HDC, TR, making last TR stitch in top of CH 1 stitch from previous row.
So your pattern is alternating HDC and TR within each row as well as alternating HDC and TR vertically. As you begin your next row, your first SL stitch and chain is your HDC made directly above the TR stitch made in the previous row. Continue crocheting in this manner, thus creating your seed stitch pattern.