|A. triquetrum, native of southern Europe blooms in May in green and white flowers at the end of a 12 foot stem in May.
Relatives of edible onions many are ornamental, hardy and sun loving. They are all found in the Northern Hemisphere.
Allium stems range in height from 6 inches to 5 feet and bear small flowers in round clusters. They grow well in rich, sandy loam with plenty of moisture.