I have a long established bottle brush plant which has been great for several years until this year (May 2018) when it seems to have suffered a lot. Can you help please, I attach photos of the plant showing areas of brown leaves and some green leaves right in the centre of the plant
Help With Bottle Brush Plant
Certified GKH Gardening Expert
This can happen during wetter years. It appears to be a fungal infection, which should be treated with dolomitic lime and wettable sulfur. You can apply this, along with your regular fertilizer once per year in spring, or as spot treatment for illnesses such as this in the future.
This article will give you more information on the care of these: https://www.gardeningknowhow.com/ornamental/shrubs/bottlebrush/growing-bottlebrush-plants.htm