Posted: 21/05/2017 at 09:14
So they suddenly just drop their leaves without turning brown first? Sorry have just re-read your first post, yes they do. Is it the plants in the same spot you are loosing? Or have they been different plants along the hedgeline.
Has the soil prep been ok? Sorry if this sounds awful, but did you put them into just soil or was into soil that has been improved with water retaining compost, etc,
am not surprised you have hedge envy after all of your efforts and expense too. It should be glorious after all of this. Is there a barrier on the other side to protect or buffer the winds? Opposite this hedge I mean, out of the picture. A hedge or fence will buffer the wind for about 10x it's height in length.
Maybe you need a combination of more water, a bit of protection and a mulch? Is there a soak hose you can use rather than a sprinkler?