Hello Katherine,
The dieback sounds like box blight (two fungal pathogens), not gravel contamination. Gravel is washed and chemical-free. The best fix is total removal and replacement with a resistant species.
My top pick: Escallonia – glossy leaves, pink/red/white summer flowers, clips into a tidy hedge, tolerates chalky soil, hardy to –5 °C.
Planting steps:
Hard work, but a healthy hedge for decades.
Gill
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