If you mean bay laurel, Laurus nobilis, the leaves ought to be deep green
all year round. If they are yellow you have a really sick tree, as others
have said it may not survive. There are many problems that present this
way. Without more information about the growing conditions, when, where and
how this happened it is pointless to guess which problem it is.
PS Ignore Brooklyn he isn't picking on you, he's nasty to everybody, can't
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