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Leylandii
Hi.
Can anyone give advice as to why the browning is occuring on this leylandii? It had been replanted from a pot that was about a quarter the size of the one its in now. Could this be the cause? It's also being watered daily. Is this to often?
Can anyone give advice as to why the browning is occuring on this leylandii? It had been replanted from a pot that was about a quarter the size of the one its in now. Could this be the cause? It's also being watered daily. Is this to often?

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Once they go brown, there's no going back. Those bits won't turn green.
Very few conifers do come back when clipped into brown wood, or once they turn brown for any other reasons.
I would doubt that's leylandii. It doesn't take that kind of clipping, but it's slightly irrelevant.
I live in west central Scotland - not where that photo is...
Here's one
https://www.amazon.co.uk/Science-Solutions-Get-Green-Formulation/dp/B00AD4EFBI
Maybe a combination? Cut back the top to new growth and paint the lower brown branches? Don't paint the green ones, they need to make energy.