I need to know the variety to know if it blooms on old growth or new growth so I know to prune it or not.

Thanks

Looks like Hydrangea macrophylla..common name mophead Hydrangea.
Sadly the leaves are not looking as green and healthy as I would expect.
The colours of the flowers can change depending on your soil.

Advice re pruning from RHS.
"Dead blooms on mophead hydrangeas can, in mild areas, be removed just after flowering, but it is best to leave them on the plant over winter to provide some frost protection for the tender growth buds below. Remove the dead flowerheads in early spring, cutting back the stem to the first strong, healthy pair of buds down from the faded bloom"

Thanks. For some reason it does not have a lot of bloom this year. Do you have any care instructions for this variety so it will be green and have a lot of bloom?

I trust that it is planted in the ground. (not in a pot)
Hydrangeas will never thrive in a pot.
It looks as if it needs a good feed eg tomato fertilizer will help with flowering and getting healthier green leaves.( use as per directed on the bottle)
When newly planted or young make sure that you water it. ..not just a tiny splash. At least a couple of gallons every evening, especially if it has been hot and dry.
Add a deep mulch, eg leaf mould, well-rotted manure, or compost, in the area around it. This helps to keep the moisture at the roots and keeps the weeds down.
Hope this helps.

Thanks. Yes it's been in the ground for over 20 years now.

Andy2019 said: Thanks. Yes it's been in the ground for over 20 years now.

Eeeck.
Didn't realise it was so old.
Please make sure you keep it well watered.
Get the water right in underneath the leaves.
Then mulch it well.

Being in such a mild climate, you can deadhead any time the flowers look worse than you like. No problem with frost issues.