|Do I need to prune the Veronica Speedwell's in spring or winter? If so - how far down do I cut them back? I am in zone 6B.
|Veronica can be pruned back to within a few inches of soil level after the first frost has killed the tops. Mulch over the crown of the plant after removing the old foliage. In spring, brush the mulch away and new stems will grow. Enjoy your garden!