Possible Clues:

• Fast-growing conifer
• Fast-growing cypress
• In ideally positioned tree
• Fast-growing trees, ideally spread across end of garden facing one
• Hedging material in line daily becoming wilder
• Tree ideally in ground
• Tall trees in line upon line — and two further
• Fast-growing tree ideally in ground
• Giant in dispute with neighbour idly playing with alien
• (Very) fast-growing conifer(s)