A long time industry standard, Vernal Alfalfa was introduced by the University of Wisconsin in the 1950s as an outstanding winter hardy alfalfa for northern climates. A cool season grower, it produces the most growth in spring and fall. Vernal Alfalfa prefers full sun, is deep-rooted and is very drought-tolerant. It prefers sandy to loamy soils, but will tolerate most well-drained soils if the pH is between 6.4-7.5. It blooms with charming purple flowers in late spring.