These have been around here for a very long time. More recently, I’ve been dividing the bulbs and spreading them around to new places. The deer avoid all members of the allium – or onion – family.
With a lot of alliums, I have noticed the leaves are insignificant, but these have broader, more visible leaves, than other members of this family. The green is a strong contrast to the bright yellow flowers, and the leaves make a more full appearing bouquet on the ground with the flowers.