Posted: 18/05/2016 at 19:18
The taller piece isn't dead Hattie, the growth has just gone to the top. You can cut heather back hard, BUT first you need to mound some ericaceous compost around the base. This will encourage new growth at the base. When that appears and starts poking through the compost you then cut it back. It takes a few weeks but with a bit of patience you can rejuvenate it.