[DIYbio] Blue orchids

So I want to dabble in plant genetics and have already gotten orchids from tissue cultures. I now want to turn them blue. I was going to take a pink Phalaenopsis equestris and try to alter it's genes to make more anthocyanin but it won't turn blue without a more basic pH. Is this correct and what can be altered genetically to change the pH and not kill the plant?

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