Jack in pulpit failed to come up this year

Question

What would kill a group of well established jack in pulpits over the winter? The group has been growing in the same place for more than 10 years yet failed to reappear this spring. Other groups have sprouted this week but not the group with the largest plants. Winter was wetter than normal but bed is well drained. We have chipmunks in the bed. First photo is bare spot where jacks had grown. Second photo shows another group that has sprouted.

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Answer 1

Excess moisture during winter or spring can kill off large groups of Jack In The Pulpit plants.

This link has more information.
http://www.extension.umn.edu/garden/yard-garden/flowers/jack-in-the-pulpit/