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Alpine hebe - green globe

Hi,
Can anyone shed any light as to what and why this has happened to my alpine hebe- green globe? I have three in pots on my decking, and noticed when looking out of my window that one has died. It's in the same position as the others, I've regularly watered during the summer (in the evening). Any ideas?!
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In theory,if it's had the same treatment as the others, and they're fine, it should also be fine Gemma.
Unfortunately, these things can happen with gardening!
Is the pot raised off the deck? If it's not, it could simply be waterlogged, which Hebes hate. Other reasons could be wind damage, but that looks unlikely as the whole plant is brown and you'd have damage on the other one. Have you got a visiting tom cat? Animal urine can cause browning and lead to the plant dying. My last thought is vine weevil, although Hebes aren't normally susceptible. The grubs do the damage by eating through the roots. If the plant pulls out the pot easily and the roots are a bit non existent, that might be the reason. If so, you might see some of the grubs in there too.
Hope that's a few ideas to think about
I live in west central Scotland - not where that photo is...
Many thanks for your help and suggestions