There are several possibilities but you may get better results if you tell us which type of hydrangea species you like, where do you live and your USDA Zone.

This is a short list based on each of the various hydrangea species:

amongst the Z6 mophead old-wood blooming hydrangeas, I have super blooming dependable Madame (Mme.) Emile Moulliere, persnickety Fuji Waterfall and I also like Sister Therese;

amongst the Z6 lacecaps old-wood blooming hydrangeas, I like Lanarth White and Veitchii;

amongst the Z6 mophead rebloomer hydrangeas, I like Blushing Bride (not technically white; has a sliver of light pink color in some soils), Peace and White Out;

amongst the very winter hardy Z3, late blooming, panicle/conical blooming paniculatas, check out Wedding Gown, Bobo, Quickfire, Little Lamb, Sweet Summer;

amongst the ones with oak-shaped leaves with nice Fall foliage, Pee Wee, Gatsby Series, Snowflake, Snow Queen and, sometimes Harmony too;

amongst the large bloom-ed and winter hardy, white, Hydrangea arborescens, Annabelle (but it can flop when wet), its "lacecap version" White Moth; its cousin with stronger stems Incrediball or Hayes Starburst.

Be aware that the white blooms will eventually fade to various shades of pink, green-pink; and that some start a little greenish; and that some white mopheads may have "colored buttons" in the middle of the bloom or some Hydrangea macrophylla white mopheads may briefly turn a little yellowish; or neither of those :o) And always look at the estimated size at maturity on the plant labels or website since some paniculatas and oakleaf hydrangeas can get huge; the others are about 6' or less depending on which one one is talking about (but the label or website will give height and spread)..

To find good pictures, just do an Internet search -using quotes- looking for hydrangea and the name of the one that you are interested in.

If unfamiliar with the various types of hydrangeas, go to the link below (has lots of pics) and scroll down, looking on the left hand margin for "Hydrangea Species:

http://hydrangeashydrangeas.com/

angelml, as Luis said, what you can grow will depend on where you are. What I can grow here and under what conditions here on the border between zone 4 and 5 NH is quite different from what Luis can grow and how he grows it in zone 7/8 TX. Moisture, temperature, soil pH, sun intensity are all quite different. Here's how to add location info to your profile so that it posts next to your name:

Go to Your Houzz in upper right of every page, click Edit Profile, and on the left side click advanced settings. Well down the advanced settings page is a blank labeled Climate Zone for Garden Forums along with a link to find your zone.

If you add info on your state or the nearest large city you will get even better information since zone only relates to average coldest winter temperatures.

Then return to the top of the page and click Done Editing.

I live in Australia in a small town in central west New South Wales. It gets hot during summer with a temps reaching 38 degrees Celsius and cold during winter with temps ranging from 5-14 degrees Celsius during the day and dropping to -3 degrees overnight with a frost

I love white flowers! I want to have vases of white flowers in my home over spring and summer I am growing pope John Paul roses which should look amazing I now want to grow hydrangea but have no idea of what kind except I know I want white. Luis_pr you mentioned some white hydrangea have coloured buttons, this is something I don't like. NHBabs I like the look of annabelle!

im inspired by the look of hydrangeas I see is pics at weddings. I have posted some pics below.

Sounds like your weather and climate are more like Luis's than mine; your area seems as though it is equivalent to USDA zone 9. Here in NH our weather is nothing like yours so I can't make any specific recommendations, though it sounds like Luis has experience with Annabelle. We get as much as 2-3 meters of snow in the winter and for 5 months we get below 0 degrees C at night, and sometimes as low as -30 C. Summers can get as hot as yours but are most often 5-10 degrees F cooler than that. We get about 100 cm of precipitation per year, distributed fairly evenly most years, so I rarely need to water. Both H. arborescens and H. macrophylla need regular water and will probably want shade from midday and afternoon sun in your area as well as mulch over the roots to help keep moisture more even.

Your photos all look to me like H. macrophylla mopheads (full flowerheads rather than the lacier lacecaps). So do a web search for images of Luis's recommendations:

amongst the Z6 mophead old-wood blooming hydrangeas, I have super blooming dependable Madame (Mme.) Emile Moulliere, persnickety Fuji Waterfall and I also like Sister Therese; (The old-wood blooming plants will bloom once per year, in spring on branches grown in previous years. )

amongst the Z6 mophead rebloomer hydrangeas, I like Blushing Bride (not technically white; has a sliver of light pink color in some soils), Peace and White Out; (The rebloomer H. macrophylla mopheads will bloom in the spring on the previous year's branches, but will also bloom on new growth branches that grow throughout the growing season.)

Or you can do an image search for "Hydrangea macrophylla white" and see what pops up.

Amazing. Thanks so much for your help!

This is the one I bought and I think the petals are too big and doesn't look as good as the pics I posted above. This is a small plant in a pot and the colour is still a bit green

The greenish petals look like they are still unfolding and so will probably turn whiter as they age but the larger petal size won't change. As the plant gets older, the heads may get larger and make the petals look more in proportion. It may be a florist's Hydrangea, and may not do well outside. Was there a variety name on it?

Good to see you in the forum, angelml. This is sure a small world. I have some relatives west of you, in Adelaide! Since your temps are similar to mine, remember to maintain the plants well mulched, in a place that is not too windy (especially the mopheads with their big leaves) and keep the soil as evenly moist as you can.

my boss would like white hydrangeas here I'm in zone 6 which adrenergic would you recommend for full sun

I would suggest one of the sun tolerant and very winter hardy ones... either an Annabelle-like Hydrangea (also known as hydrangea arborescens) or a Pee Gee-like hydrangea (aka as hydrangea paniculatas). Winter hardy to Zone 3-4.

Some of the newer arborescens include shrubs that will produce lime or pink colored blooms from the start; the rest of the arborescens start either white or lime green; turn from lime to white; turn white to pink-ish, greenish mix; turn brown or sand-ish. Have him/her select based on an arborescens that does not start pink and whose height/width is acceptable.

Some of the new paniculatas are more compact. The older varieties tended to get large. Limelight if one of the few paniculatas that will produce lime colored blooms from the start; then they turn white then pink/etc. Little Lime is similar but more compact. The others start white then turn pink/etc so choose amontgst those based on height/width.

The blooms tend to vary some... maybe a little at times... so bloom form/size, plus height/width would be the parameters I would use to select from them. You can look up online nurseries or local plant nurseries. Inventories of these should start getting larger soon.

Both arborescens and paniculatas are very sun tolerant in your area. Water and mulch well.

Note: you included a picture but no details of exactly where the shrubs were going to go other than "in full sun"; how big are nearby shrubs, etc.

Note: hydrangeas are deciduous so be aware of this if he/she prefers evergreens in the front of the house.

Incrediball ?

tarrracotta ?

Yes. There is also Hydrangea Invincibelle, which is quite similar to Incrediball. Or Invincibelle Wee White, a version of Invincibelle which is much more compact. Caution: there are other Invincibelle "cousins" that have pink blooms though; they are called Invincibelle too so be careful: Invincibelle Ruby, Invincibelle Spirit, stuff like that have pink blooms so always ask what color blooms they start with...

Plain Invincibelle and Invincibelle Wee White are white (may actually start lime colored sometimes though, just for a week or two though...) The compact version (Wee White) can be grown in containers but the regular version of Invincibelle/Incrediball can get large (5'? 6'?) and would require a larger container... probably something to discuss/select with your boss and with a local plant nursery. But water well if you prefer over a panic.

To be honest, since this is full sun, even in my cooler zone a Hydrangea arborescens like incrediball or Annabelle would droop daily in full sun, not an attractive look, and the flowers will fade faster than if you had afternoon shade. The big leaves lose water faster that the roots can replace them, even with good irrigation IME.

Since this spot is in full sun, your only real choice is one of the whiter selections of Hydrangea paniculata. If you don’t mind it starting pale green and changing to white, check out Limelight at 8’+ and Little Lime at 4’-5’. If you want a plant that is really white for as long as possible, find a source for White Diamonds at 5’ which in my garden is white from July until some time in September, when it takes on a shade of creamy light pink until frost. White Moth is another that keeps the white blooms, and it is larger at 7’-8’.

Incrediball, morning Sun, afternoon shade

Morning sun and afternoon shade, as Hyed and I both grow H. arborescens, will be what keeps the flowers looking best for longest.

I have three white based Hydrangeas:

LimeLight - cone like flower that has a lime green tint to the flowers.

Incrediball - HUGE ball like flowers, bigger than my hand. Only downside is it was extremely droopy the first year. Hopefully as the plant ages, it will be less droopy. At least that's what I was told.

Vanilla Strawberry - Like the LimeLight but the flowers are PURE white and turn a beautiful pink in the fall. Also the branches of the plant had a maroon like color. This is my favorite white based Hydrangea.