Delete branches listed by git branch -a

Question

The command git branch -a lists a bunch of branches that are NOT on the repository, and NOT local branches. How can these be deleted?

* develop
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Answer 1

If you have remote-tracking branches (such as origin/cloner in this case) which are left over after the corresponding branch has been deleted in the remote repository, you can delete all such remote-tracking branches with:

git remote prune origin

The documentation for git remote explains this as:

Deletes all stale remote-tracking branches under . These stale branches have already been removed from the remote repository referenced by , but are still locally available in "remotes/".

With --dry-run option, report what branches will be pruned, but do not actually prune them.