Sunflower species and cultivars

The genus Helianthus

The sunflower most people know is Helianthus annuus — the annual garden and oil plant. But that is only one species within a larger genus. The USDA PLANTS database and the Flora of North America recognise around 70 species in the genus Helianthus (family Asteraceae). Nearly all are native to North America, with the centre of diversity in the central and southern United States.

The name Helianthus comes from the Greek helios (sun) and anthos (flower). Carl Linnaeus formally described the species Helianthus annuus in his Species Plantarum of 1753, the work that fixed modern two-part naming. The genus belongs to the daisy family (Asteraceae), the largest plant family in the world, which also includes the daisy, the aster and lettuce. That explains the build of the "flower": what looks like one flower is in fact a head of hundreds of small flowers — the outer ones with a strap-shaped petal, the inner ones tubular. We cover that anatomy in full on the page about biology.

The botanist Charles Heiser mapped the taxonomy of the genus in his 1976 monograph, and that framework still underpins modern revisions. The distinction between "species" and "cultivar" matters here: a species such as Helianthus tuberosus (Jerusalem artichoke) is a wild, natural unit, whereas a cultivar such as 'Teddy Bear' is a human-selected variant within Helianthus annuus. Many Helianthus species cross with one another, which blurs the exact species boundaries and keeps the figure of 70 fluctuating slightly between sources. We cover the wild side in detail on the page about wild Helianthus species.

Annual versus perennial

The main division within the genus is the life cycle. Helianthus annuus is annual: it germinates, flowers and dies in one season, surviving only through seed. Other species are perennial and return for years from underground rhizomes or tubers — think of Helianthus tuberosus, Helianthus maximiliani and Helianthus salicifolius.

For the garden this matters a great deal. You re-sow annual sunflowers every spring, which keeps your choice and placement open. Perennial species establish permanently and can spread aggressively — the Jerusalem artichoke is notoriously hard to contain. For more on the plant itself and its life cycle, see the page on biology.

Wild versus cultivated

Wild Helianthus annuus is a branching plant with many small flower heads and relatively small seed. Domestication in North America, some 3,000 to 4,000 years ago, selected plants with a single large head and large seed. Almost all modern giant cultivars descend from that single-headed line, while many ornamental cultivars have kept or reintroduced the branching, multi-head growth form.

That distinction governs what a cultivar is good for. A single-headed giant such as Russian Mammoth gives one spectacular flower and plenty of seed, but needs staking. A branching cultivar such as Lemon Queen produces dozens of smaller flowers over weeks — ideal for bees and the vase. More on the wild ancestors is on the wild species page.

How cultivars are grouped

Garden centres and seed merchants usually group sunflower cultivars along five axes:

• Tall/giant — single-headed, 2.5–3.7 m (8–12 ft), for contests and seed harvest (e.g. Russian Mammoth, American Giant).
• Branching/multi-head — 1.5–2 m (5–6.5 ft), long bloom, many flowers (Lemon Queen, Velvet Queen, Autumn Beauty).
• Dwarf/pot — 40–90 cm (16–35 in), suited to pots and balconies (Teddy Bear, Sunspot, Pacino).
• Pollen-free cut flower — F1 hybrids, uniform, stain-free (ProCut series, Sunrich series).
• Coloured — red, bronze, bicolour instead of yellow (Velvet Queen, Moulin Rouge, Ring of Fire).

These groups overlap: Velvet Queen, for instance, is both branching and coloured. The full set of over thirty cultivars, sortable by any property, sits in the cultivar database.

Height comparison at a glance

Edible versus ornamental

Not every sunflower is meant to be eaten. Cultivars bred for seed harvest, such as Russian Mammoth and the commercial oil lines, carry large, well-filled kernels. Many ornamental cultivars yield little usable seed, because selection for flower shape or colour came at the expense of seed fill. Fully double cultivars such as Teddy Bear deliver almost no seed. If you want to harvest for eating or bird food, deliberately choose a single-headed seed cultivar — more on that on the page about growing.

In agriculture there is a sharper split that you rarely meet in the garden: oilseed versus confection seed. Oilseed cultivars have small, entirely black kernels with a high fat content and go to the oil press; confection or eating cultivars have larger, grey-striped kernels sold as a snack or bird food. The large-seeded heirloom giants such as Russian Mammoth fall into that latter group. Which part of the kernel is edible and how to harvest the seed safely belongs to the wider account of the flower head on the page about biology.

Pollen-free for florists

Pollen-free cultivars were developed for cut flowers. The pollen of ordinary sunflowers drops onto tablecloths, vases and clothing and leaves stubborn yellow stains; pollen-free F1 hybrids solve that. The ProCut series from Sakata is the best known. The trade-off: pollen-free cultivars offer no pollen to bees, so for the pollinator garden you should instead choose a cultivar with pollen, such as Velvet Queen or Lemon Queen. How sunflowers feed bees is covered under bees.

The hallmarks: KAVB and RHS

Two bodies largely determine which cultivars count as reliable. The Royal General Bulb Growers' Association (KAVB) is the official registration authority in the Netherlands for cultivar names of bulbous and related ornamental crops. The British Royal Horticultural Society (RHS) trials cultivars in garden assessments and grants the Award of Garden Merit (AGM) to plants that perform reliably. Cultivars with an AGM, such as Lemon Queen, are generally a safe choice for the average garden. Which cultivars carry an AGM is noted per row in the cultivar database.

Where the garden cultivars came from

The hundreds of garden cultivars did not arise at random. After domestication in North America, the sunflower travelled to Europe with Spanish navigators around 1510, where it first landed as an ornamental in botanical gardens. The great leap came in Russia in the nineteenth century: growers there selected systematically for seed size and oil content, and it is that Russian selection that returned to North America as 'Mammoth Russian'. We describe that whole route under the history in Russia and Ukraine. Only in the twentieth century did the emphasis shift to ornamental traits: branching, colour, dwarf growth and — from the 1980s and 1990s — pollen-free F1 hybrids for the cut-flower trade. The modern cultivar database shows that development by cultivar and year.

Choose by purpose, not by picture

Most disappointments arise from picking a cultivar on looks rather than function. Decide first what you want: one large show bloom, a long vase season, food for bees, or seed to harvest. For a focal point at the back of the border, take a single-headed giant such as Russian Mammoth, provided you can stake. For continuous cut flowers, choose a branching cultivar such as Velvet Queen, or — if stain-free bouquets matter — a pollen-free cultivar such as ProCut Orange. For pollinators, lean towards pollen-rich cultivars such as Lemon Queen; and for a balcony or pot, stay with a dwarf such as Teddy Bear, with the points to watch from growing in containers. With every cultivar, mind the position and air movement, because dense planting invites mildew.

F1 hybrid or open-pollinated cultivar?

One choice that is often forgotten, but returns every following year: do you buy an F1 hybrid or an open-pollinated (seed-saveable) cultivar? With an open-pollinated heirloom such as Lemon Queen or Russian Mammoth, you can harvest seed from your own head and re-sow next year; the offspring closely resemble the parent. An F1 hybrid such as Sakata's ProCut series arises from a controlled cross of two parent lines and is uniform and predictable, but the second generation breaks up into uneven plants. So anyone saving seed from an F1 hybrid does not get identical flowers back, and in practice buys new seed each year.

For the gardener this is a trade-off between convenience and cost. F1 hybrids deliver tight uniformity and are the standard in professional cut-flower growing; open-pollinated cultivars are cheaper in the long run and suited to anyone who wants to save their own seed. The cultivar database notes per cultivar whether it is a hybrid or seed-saveable, so you can make that choice deliberately. How to recognise, dry and store ripe seed belongs to the practical side on the page about growing, and the flower structure that produces the seed is covered under biology.

Cultivar types compared

Type	Height	Bloom	Pollen	Best for
Giant / tall	2.5–3.7 m (8–12 ft)	1 large head	Yes	Seed harvest, contest
Branching / multi-head	1.5–2 m (5–6.5 ft)	Many, long	Yes	Bees, cut flower
Dwarf / pot	40–90 cm (16–35 in)	1–few	Varies	Pot, balcony, kids
Pollen-free cut flower	1.2–1.7 m (4–5.5 ft)	1 uniform head	No	Bouquets, trade
Coloured	1.2–2 m (4–6.5 ft)	Varies	Usually yes	Ornamental, photography

With this framework in hand you can choose deliberately. Start at the cultivar database if you want a specific cultivar, at the wild species for the botanical background, or at growing in containers if space is tight.

Sources