Don't settle for a match of three crops if you can score 5. This is a standard match-3 game in some ways, so watch for an area where you can place a crop to score three in a row vertically and horizontally at once (a 'T' formation), or where you can drop a crop in a single space between two of the same crop on both sides, which produces a match consisting of 5 in a row. As a reward for matching 5 at once, you'll eliminate crops of that sort from the board for a hefty points bonus.