If you want an evergreen screen or privacy in a hurry, these are for you. You either love them or hate them, but there is no other form of hedging that will do the job as quick and economically. There are two branches to the family and they are variations of green or gold coloured. Golden leylandii grow 20% slower than green leylandii. Up to 90cm in one year is achievable with the green variety. They will grow huge left un-cut and will easily achieve 20 metres in 20 years. For smaller gardens pick the golden forms. Apart from the fact they are evergreen and green or gold, there is little more to say about them.
As they grow rapidly they will need trimming a couple of times a year. It is wise to keep on top of the trimming as you do not want to trim into the brown as they will struggle to re-generate new growth from here, plus it won't leave for an attractive hedge. It is also important to keep anything temporary from making contact with the plant as this too will turn the plant brown where the foliage is covered. This includes allowing rubbish to grow under the base. Sharp shears or hedge cutter and go easy.
There is not really anything that really they dislike. They grow in all soils and most positions. If you have deep shade use Thujas
. Apart from poor clipping they are trouble free.
Give them plenty of organic fertiliser in early spring to get them to the height.