I brought this hydrangea plant from a local nursery it was a lovely bright blue when I planted it into the ground. It became like this after a week or so.
Any advice to what could have happened and what I can do?
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This problem is unlikely to be due to soil ph issues - yes, a blue hydrangea does need acidic soil conditions to remain blue; if it's too alkaline the flowers will be pink, and if it's around neutral, the flowers will be a mauve/pinkish/washed out bluish colour, but yours has not been in the ground long enough for that to be the cause, its roots will mostly still be pot-shaped from when it was planted, with no wide penetration into the surrounding soil. The flowers can look sort of similar to this as they start to fade, but it does look as if your plant has had more of a problem with insufficient water because some of the petals look wilted - when you first plant a shrub, especially at this time of year and because it's flowering, it will need copious and frequent watering, even if there is rain about, unless the rain is torrential for some hours. A few rain showers is nowhere near enough to penetrate the root ball of the plant, which is probably down to 6 inches below soil level. Keep the plant well watered so it can establish itself properly from now on up until autumn when the weather becomes cool and damp and the plant starts to lose its leaves. It will not flower again this year, but should do next year, at which point you will know whether your soil ph is acid or alkaline.