How do you crochet a colorful cardigan?

Which crochet stitch uses least yarn?

Openwork stitch patterns often use the least yarn. For example, a double crochet mesh will use less yarn than a basic double crochet fabric because it has openwork spaces between the dc stitches. Look for patterns that incorporate a lot of spaces and chains when seeking to use less yarn.

How many skeins of yarn do I need to crochet a blanket?

For a full-size blanket, you will need quite a bit of yarn, probably around 13-18 balls or skeins of yarn. Usually, afghans are very colorful, so you may have one skein of each and, if it’s it’s really colorful, that can add up. If the blanket only has one or a few colors, it may only be 10 skeins.