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Bluebonnet plants have the capacity , with the help of Rhizobium, to produce as much nitrogen as soybeans, which often yield as much as 100 pounds of nitrogen per acre. Bluebonnets are not a preferred food of deer, as are clover and vetch. Therefore, survival of bluebonnet plants in areas heavily populated with deer is ensured. The bluebonnet is also extremely cold tolerant, so freezes normally will not kill the plants. they are also legumes. per this site: http://aggie-horticulture.tamu.edu/archi...