Mono-floral honey is where the bees have been foraging predominantly on one type of plant, and is named according to that plant. (> 45% pollen from one plant).
Crystallization is a natural phenomenon in Honey: Honey is a super-saturated solution of two sugars glucose and fructose. Since it's super-saturated, it's a natural chemical process that some of the sugars eventually come out of solution. Honey will even crystallize when it's still in the comb.HYTLCP01_03