An umbel of flowers on a leafless stalk, narcissus and allium

7 flowers in this family

Everything in this guide that belongs to Amaryllidaceae

Rounded head of blue agapanthus flowers on a tall bare stem

Agapanthus

Agapanthus praecox
10-18 days

Agapanthus
Perfect purple allium spheres on tall bare stems

Allium

Allium hollandicum and relatives
7-14 days

Allium
Large red amaryllis trumpets on a thick hollow stem

Amaryllis

Hippeastrum spp.
7-14 days cut, 3-6 weeks as a bulb

Amaryllis
Daffodils

Daffodils

Narcissus
5-7 days

Daffodils
Bright pink nerine flowers with recurved sparkling petals

Nerine

Nerine bowdenii
14-21 days

Nerine
Clusters of small white paperwhite narcissus flowers

Paperwhites

Narcissus papyraceus
1-2 weeks in flower

Paperwhites
White snowdrops with green markings nodding above snow

Snowdrops

Galanthus nivalis
3-5 days, and only if kept cold

Snowdrops

The sap problem, and it is not a myth

Cut a daffodil and it bleeds a clear slime. That sap carries calcium oxalate crystals and other compounds that block the water uptake of other flowers, and it does it fast. A daffodil put straight into a mixed arrangement will shorten everything around it, and tulips are the classic casualty.

The fix is simple and it works. Condition daffodils on their own in plain water for several hours, ideally overnight, then move them across without recutting. The bleeding largely stops once the cut has sealed, and a daffodil that has been stood alone first behaves itself afterward. Recut it later and you start the problem again.

The same sap is why nobody should be chewing on these. Every part of the plant is toxic if eaten, bulb worst of all, and there is a small but steady history of people mistaking daffodil bulbs for onions. That is not a coincidence either, given what else is in this family.

Relatives you already know

This is the onion family. Garlic, leeks, chives, shallots and the ordinary kitchen onion are all Allium, sitting in the same family as the amaryllis on the windowsill. Crush an ornamental allium stem and the smell tells you immediately, which is worth remembering before putting one in a table arrangement.

That smell is also a practical point in the cooler. Allium in dirty water announces itself across the room, and the answer is clean water changed often rather than more flower food.

The family name comes from Amaryllis, a shepherdess in Virgil's pastoral poetry. There is a lasting confusion attached to it: the plant everybody calls amaryllis and buys at Christmas is really Hippeastrum, from South America, while the true Amaryllis is a South African genus with two species. The trade name stuck and is not going anywhere, so both usages are correct in practice as long as you know which one is on the label.