My hydgeraniums are pink how do I make them blue?

Someone told me to use ashes. This does not work. Ashes make them pink.

My hydgeraniums are pink how do I make them blue?
Hydrangea are a natural pH tester for your soil. In neutral soil they will bloom white. in an alkaline soil pink and acidic soil blue. You can change the pH of the soil by adding lime or super phosphate to raise (pink) or aluminium sulfate (blue) to lower it. This is a chemical change to the soil and will take time for it to happen. As opposed to fertilizing which happens quickly. If you were to do this in the fall, the following season you could expect the different coloured blooms
Reply:Go with "The Plant Doctor", he is right on the money
Reply:ok, so that you do, but only if the flower is white or close to white, is that you get a small bag of blue ink and mix it with water. water it the normal, like how you do now, and slowly, it will turn blue! the process is pretty kl cuzz at one point it is half white, half blue! it will take 3-4 weeks to turn completely blue! hope you do it and it comes out right!
Reply:http://www.hydrangeashydrangeas.com/colo...





Here's a website that will give you some tips on changing the color of your Hydrangeas. Have fun!
Reply:My hydrangea's are a very vibrant blue. the reason why the ashes don't work is because they are more alkaline and you need something acidic to turn them blue. get a bunch of rusty nails and lay them around the base of your hydrangea. it might take a while but they will turn blue. you can put it around half the plant and half of it will turn blue and the rest will stay pink. it is really neat. hope this helps.
Reply:coffe grinds add acid to the soil and will change the color. not positive of the amount to make them blue, but you may find a color you like
Reply:white hydras don't change color... except to go rosy as the flowers age....





the link given in the first answer is the best info....





whichever way you're trying to get them to change, it takes way more than one season when they are planted in the ground.... a potted hydrangea will be easier to change and quicker than one in the ground , as you can more easily control both the pH and the content of the soil....





acid soil and aluminum sulfate gets you blue....


alkaline soil gets you pink...





in between the changing, you can get lavender, blue, pink, and mixes on one flower, too!....if you are diligent at keeping the soil pH where it should be, the third season you should see all one color on your blooms... if that's what you want.... personally, I like the mix.....





if you have one that is already the color you like, use the same info (in that link) to KEEP it that color.....xuz it will change if your soil's pH or aluminum content varies ..............