Which side of your horse's neck is correct to plait/lie mane on?

My mare's lays on the left, but as it's quite a silky mane it will plait on the right.

I tried to train it over when she first arrived, but she could have plaits in all week under her rug, but as soon as you took the plaits out it would be back on the left within an hour or so.
 
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