Not lots of ants

The ants nest at the foot of the knapweed continues to be active, with signs of fresh excavations most mornings - but few if any ants.

The base of the knapweed can be seen left.

A snap taken just over a year ago can be seen at reference 1. The nest has spread out a bit since then. Rain must contribute, washing earth down from the top to the bottom, with the ants doing what they can to regain height.

Reference 1: http://psmv3.blogspot.co.uk/2016/06/ants.html.

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