Hydrangea bouquets: one stem doing the work of five
A hydrangea head is not a single flower. It is a frame carrying a hundred small florets, and that frame is wide, which is why three stems in a vase read as an armful.
Florists use this the way a builder uses a large panel. Volume arrives fast, and the silhouette comes from two or three decisions instead of thirty.
The saving is in stems, never in care.
What it does to the rest of the bouquet
A round head sets the outline, so everything standing next to it becomes secondary by default. Roses beside hydrangea stop being the event and turn into texture inside a mass. Spray flowers, grasses and anything with a broken edge work better here, because they interrupt the sphere rather than compete with it. The usual mistake is to pair hydrangea with a second large round shape, a big peony or an open garden rose, and end up with a bouquet that has two centres. One of them has to lose.
Height is the other lever. A short stem drops the head low and makes a dome, while a longer one lifts it clear of the rest so the bouquet reads as a single object across a room.
Colour comes out of the soil
Pink and blue hydrangeas are frequently the same cultivar. The pigment in the floret shifts with the acidity of the ground the plant grew in: acid soil pushes the heads towards blue, alkaline soil towards pink, and the ground between them produces lilac and those muddy in-between shades that photograph poorly and look excellent in a real room. White cultivars sit outside all of this and stay white whatever the soil does. For a buyer the consequence is practical rather than academic, since blue is the least repeatable colour in the trade and two deliveries under one name can differ.
Green heads are usually a stage rather than a variety. A head is green before it takes colour and green again once it begins to age, and the late green is the more useful of the two.
Water, in short
The evaporating surface is enormous, so the flower drinks heavily and collapses quickly when it cannot. Left out of water on a table, the head softens within the hour and the petal edges curl inwards. Put the stem back and it usually recovers, faster still if the whole head goes into cold water for half an hour, because hydrangea takes water through the florets as well as the stem. The cut wants to be long, angled and made with a blade, since the stem is woody and seals within minutes of being trimmed. A crushed stem end will not drink however deep the vase is.
Use a heavy vase with a wide neck, because the head outweighs everything below it.
The dried afterlife
Hydrangea is one of the few cut flowers that dries well with no hanging, wiring or treatment. Stop topping up the vase and let the water go down on its own, and the head loses moisture slowly enough to hold its shape. Colour moves as it dries, blue towards grey-green, pink towards a dusty biscuit tone. Direct sun undoes the result, bleaching the head and making it brittle, so a dried arrangement belongs on a shelf away from the window.
A dried head is fragile in one direction only. Pressure from above crushes it, while the same head sits in a dry vase for months if nothing touches it.
Who they suit
Hydrangea bouquets go to people who prefer mass to detail, and to rooms with space for a wide silhouette. They are a poor choice for a long delivery day or a desk nobody visits, because the flower will not wait. If the recipient in Dushanbe is out until evening, send something with a tougher head.
The reward for the fuss is a second life that most cut flowers never get. The same heads stay on a shelf long after the rest of the bouquet has gone in the bin.