I planted a row of Thuja plicata atrovirens, about 4 years ago, the
plants I purchased were 4ft tall and looked healthy and bushy at the
time. They have now grown in height to between 6 and 8ft, but they are
now very spindly and thin with very little foliage. Some are so thin it
hardly looks like there is any hedge at all! I have looked on the
internet and they seem to have a disease that looks like Keithia blight,
any new growth is soon damaged by the blight. Is this a disease they
will recover from, and will they later become more bushy? or will they
just get taller and remain spindly? I have not trimmed them as I wanted
these to grow into large trees, as there is plenty of space for them, Is
it time I cut them down and replaced them, with something else, or wait
longer for them to recover? I am in mid-Wales, do they just not grow
well in this area?
Any advice would be appreciated.