"Houston" We Have a Problem

I had put a row of pansies where the pink heaths is now blooming.

The Pansies full grown started to  disappear only a hole would
be left.

This is a rodent a VOLE  is the problem,it takes the 

flowers down that hole and eats the roots.

The gardener puts a heavy mulch in the beds every spring

that is what they like roots and bark.

The solution is poison  gas pumped in the holes or mouse traps
with peanut butter on them. They come out at night.
We will try five traps if this fails the gardener will  have to make
that other call.
In all my years of having gardens never ever had this problem
in Texas , Ark , or Tennessee.