When to cut back?
My purple flowering Salvia was covered in flowers last year but then grew too large. It had a "hard" haircut and grew back nicely but no flowers this year! Now it needs trimming again - when shall I do this and how much should be cut off?
If it is Salvia leucantha (long sprays of purple flowers with long narrow pale green/silver undersides leaves) just pinch out the new growth. In my garden (3104) it flowers later.
All turned out well in the end. It was Anthony Parker and we had the most glorious display. Now all trimmed back for next season.