Birthday in Hong Kong: a bouquet in the bauhinia's pink, any month
From November to March Hong Kong's floral emblem, the pinkish-purple Bauhinia × blakeana, is in flower, so a winter birthday in Hong Kong falls while the city's own flower is out. The bauhinia is a tree rather than a cut flower, so a bouquet borrows its pink from roses, lilies and lisianthus, put together to order whatever the month.
Pink roses, pink lilies, lisianthus: a palette borrowed from the bauhinia
Hong Kong birthdays call for red, pink and peach rather than white: white flowers, including white lilies, rarely feature as a birthday gift here. The rose selection includes Ecuadorian roses and French-style roses; French here names a technique, not a variety: florists ease each outer petal back by hand, and the rose arrives already looking fully open. White still has a place next to pink, in a bouquet such as 11 White and Pink Roses.
Where a bouquet skips roses altogether, coloured lilies can carry the pink, paired with gerberas in a Lily and Gerbera Bouquet; lisianthus, or hydrangea with misty, can carry it too. Exact shades and stems are not fixed in advance: describe the occasion and the budget to the florist, and the bouquet comes back as a photo with a price before payment.
One practical note travels with lilies: pollen from an open bloom stains fabric, so florists remove the anthers before the bouquet leaves. Where the birthday belongs to a cat owner, a lily-free bouquet is the safer choice.

A bouquet for the door, a basket for a restaurant table
A hand-tied bouquet suits a birthday celebrated at home or in the office, handed straight into the recipient's arms. Hotels, offices and orders from abroad follow rules of their own.
When the celebration moves to a restaurant table, the delivery time is agreed with the venue beforehand, so the courier arrives for dessert or for the toast rather than before the table is laid. A flower basket suits that table better than a hand-tied bouquet: it stands on its own without a vase, so nobody at dinner needs to go looking for one.
A small cake and a card ride along with the bouquet
The card that comes with a bouquet is free to add and free to leave blank: the courier reads only the recipient's name and address, nothing inside the envelope, so a message stays private or the whole bouquet arrives anonymous, whichever the sender picks.
Sized to fit in one hand, a bento cake comes packed in its own takeaway box. The format started in South Korea and spread across Asia through social media, with a short message usually piped onto the icing in cream, and it goes into the same order as the bouquet, alongside other gifts that ride with the bouquet. Once it arrives, a cream cake goes straight into the fridge, since it won't keep for long at room temperature.
There's no call to the recipient beforehand, so the surprise holds, and a photo of the finished bouquet reaches the sender before the courier leaves. Same-day delivery covers most orders, with exact timing shown on each bouquet's page. Delivery is free in the centre, with a flat charge by delivery zone elsewhere.

A good place to start is roses, where French and Ecuadorian stems come in red, pink and white, or a run of mixed bouquets for the rest of the pink palette; a small cake or a card can be added to either before checkout.