By Peterdraper
United Kingdom 
We have a leylandii in our garden and since I cut it back it seems to be dying from the bottom up .Any answers please.
2 Jun, 2014
Answers
Have you kept the hedge watered? Cutting is stressful for any plant. There is an aphid that causes browning on Cypress; did you notice any browning before pruning?
2 Jun, 2014
As NP says if you cut back beyond the green part you might as well cut off the dead branches.
2 Jun, 2014
Previous question
« When growing chillies do you pick the side stems out like tomato plants
if you cut them back too hard they don't regrow wear there cut and look brown and dead .
2 Jun, 2014