Ask-a-Dave's-Gardener: Morning Glory `Heavenly Blue` ( Ipomoea tricolor ) problem, 1 by CrowCtg

CrowCtg wrote:
My Morning Glory `Heavenly Blue` grows the wrong colour, it grows pink, and has done this the last two years from different seed packets. They have done the same from growing in the ground ( though propagated in soil free compost) and in hanging baskets for the last two years. My guess is pH, but why is the colour wrong in both ground and basket?

Even if its pH I don\'t know how to correct it. I read the pH test kits are all but useless

How do I get them to grow and flower blue. Any idea\'s are welcome

Below is an image of the colours I get, but by eye its paler than the image