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9 messages
04/07/2012 at 15:32
I've just bought a Hydrangea Koria plant which has small white flowers which Ill be planting in a large pot. Am i correct in thinking if i don't get the soil PH correct then the flowers may change to pink or blue?
04/07/2012 at 18:27

I'm fairly certain that white hydrangea's stay white whatever the PH.

04/07/2012 at 18:28

You could use a lime free compost to be on the safe side.

04/07/2012 at 19:20

You should always use ericaceous compost when potting on Hydrangeas anyway. This will keep the colour true.

04/07/2012 at 19:25

Your plant should stay white but if you want to be sure you can water it with sequestrene in rain water if you live in a hard water(limey) area.  If you want a blue flowered plant then water with hydrangea colourant and the plant will turn blue. 

04/07/2012 at 19:32

Mark, colourant only works on blue Hydrangea which have turned pink through being in limey soil/compost. It will not turn a white Hydrangea blue.

04/07/2012 at 20:02

Sounds like my white flowers will be safe. I have some ericaceous compost, thanks for the replies.

11/09/2015 at 02:32
I bought 2 green/white ones. Put in large pots. They now have white mopheads tinged with Pink. Why?
11/09/2015 at 04:03

They take a while to respond to the new conditions.  But don't use tap water to give them a drink if you are in an area with hard water - this might add a pink tint.  Use rainwater and they should keep their original colour.

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9 messages