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LeadFarmer
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?
Dovefromabove

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

Dovefromabove

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

daituom

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

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. 

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daituom

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.

LeadFarmer

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

I bought 2 green/white ones. Put in large pots. They now have white mopheads tinged with Pink. Why?
gardeninggenes

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.

Pink and blue hydrangeas will change colour in response to the soil conditions but white hydrangeas will not be affected and will stay white whatever you do.  Most white ones will naturally shade through to pink as the flowers age so, if you want to keep them looking white, just deadhead when they start to turn pink. 

Lyn

Not sure they will stay white, I dig my whites out after a couple of years,they first turn to pale grey then a dirty pale grey/ blue, then they're out.

i have just one left now that had stayed white, but my soil is very acid,  

BobTheGardener

White ones will stay essentially white but the blooms can become tinged with pink or blue as they age.  Which colour they turn is probably more down to genetics than anything else.

The white ones I have planted always stay white.  some shade from hot sun will help that.  

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