It may be a lot bigger if it is in a happy spot. You should see my limelight it is at least 12 ft tall. Fire and ice is a very pretty hydrangea. I might need one of those.

Mature Plant Size: 96-180" tall (8-15 feet), 72-144" wide (6-12 feet)

Fire and Ice Hydrangea | American Meadows

Thank you so much for your reply frankielynnsie, that is what I saw as well. But because I also saw other websites mention 5' (and that is what my tag says), I am still hoping maybe someone who has one / has had one can give more info!

I fell in love with the white blossoms and burgundy stems, but if it is proven to actually be that tall, I will have to plant them somewhere other than where I originally planned.

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The Limelights are so pretty, I have the Baby Limeights and think the green blooms are so perfectly pretty mixed with so many other varieties of flowers...you are lucky to have 12' of them!

You can keep them pruned down, it will just be an extra chore every year. If you don't want to fight nature you will need a spot that can accommodate it.

The US plant patent states 1.8-3 meters tall, so about 6-10 feet.

I would give it at least 10’. Plant tags often give an optimistically small size, often a 5 year size. Not a single one of my panicled hydrangeas has ended up at the smaller end of the size ranges given. I think I am in fairly ideal growing conditions for panicled hydrangeas, and my soil is similar to yours, sandy and acidic. I have a Fire and Ice, but it is in a garden that I have not been in for three seasons due to several serious family health issues keeping me otherwise occupied. However, life has finally settled some and I am now slowly getting the gardens back in line, so I will see if it has survived the total neglect. Based on my other paniculatas, it is likely fine.