Forms in the ocean when dead animals' shells pile up on the ocean floor over millions of years to a depth of hundreds of meters. Then compaction and cementation change the sediment to limestone.
Remember, flowers and arrangements usually cost more around Valentine's Day and Mother's Day because florists are so busy making many different types of other arrangements. In 2015, the average cost of a wedding flowers is between $1,921-$2,101.
1 As with other wedding flowers, centerpieces with fewer flowers and locally grown, in-season flowers are cheaper, while large centerpieces with exotic, shipped-in flowers cost more. 2  The average total cost for floral table centerpieces is $1,272, according to The Bridal Association of America.