Step 1: Background: The Clover
Step 2: Patterns, Patterns, Patterns
Do not get on your hands and knees with magnifying glass in hand, individually examining each clover. From standing height, look over the entire patch, brushing the clover with your foot to ensure none remain unexposed. If you enjoy math problems, eye-spys, the game "SET", or any pattern game in general, you'll be in your element. Amongst all the sets of 3 leaflets, any mutation will stick out like a sore thumb.
Step 3: Statistically Speaking...
Mutant clovers are also more prevalent later in summer than they are in spring, and some places just seem more environmentally favorable to produce mutants.