Is this patio hydrangea about to become big and bushy any time soon?

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I bought this no less than a month ago and if you want an idea of how these change colour, when I bought it was lovely blue with a touch of mauve - now it's white. My question is, before I plant this with a load of seaweed or blue crystals to make it blue again, will it get larger? I just assumed it would with a bit of compost but now I'm thinking, well, will it take three years to become some big bushy hydrangea you see in front gardens?

If so, I may plant this elsewhere and next week, now I'm ready to plant, buy a big bushy hydrangea - maybe pink even seeing as they change colour so easily given the right soil - and plant that one instead to recreate the effect I was going for. What does anyone think? Will it take years to get two feet high? The picture gives a sense of scale.

The flowers have pretty much finished now, which is why they have gone pale. It won't get massive in a pot by the way, the roots are too restricted.

My hydrangeas turn blue when planted in the garden because the soil is acid. You will need to test your garden soil for its PH. If it’s towards acidity then you’ll probably get blue or purple flowers. If it’s Alkaline then they’ll be pink.
There are ways of making the soil around the plant acidic, but they’re probably not a long term solution.

The size will also depend in the variety. What is this one called?

I thought white hydrangeas were always white and they couldn't turn.

They can. I have ones that go from white to green, or white to pink.

Hi everyone, thanks! I wasn't complaining about the colour turning - I was aware hydrangeas could do that, though surprised to see it go white, I thought it would go from blue to pink - but rather that it might take three years or more to turn into a big bushy thing. If so, I might just buy another one that's more there.

They grow fairly quickly but again that depends on the type (which one is it?), the soil they are planted in, regularity or watering and feeding, position etc.

Thanks everyone, this particular hydrangea is an Angkong Blue. Height and spread can be 5ft by 5ft. So it can go big - but with some of these things I wonder if it takes months or years... I take the point about actually planting the thing so its roots can spread!