Howdy Folks, I have a friend who has several plants that are starting to die off in a big way, these are outside and this is in the southern hemisphere so are starting to go to head at this time of year. he is very careful with his soil preparation and has been doing this for many years in the same area.
The issue is that the plants which are around 5 foot tall at the moment are starting to die off, the stalks are going very woody at the bottom and it is heading up the main stem, as it goes up the stalk the leaves are going yellow and dying. Does anyone have any suggestions as to what it could be, he has used the same area for many years and never had this problem, over the winter he puts a lot of effort into prepping the soil he digs lime into it and digs a lot of mulch into it but this is the first year he has had this problem.
Any suggestions would be very much appreciated.