Beach sunflower

Sun

Full sun; flowering and growth become sparse in shade.

Water

Water regularly while establishing, then only during prolonged dry spells. Avoid persistently wet soil.

Soil

Well-drained sandy or gravelly soil; tolerates low fertility and coastal conditions but struggles in waterlogged clay.

Height

1-3 ft (0.3-0.9 m)

Spread

3-6 ft (0.9-1.8 m)

Flowers

Yellow rays around dark brown centres; spring to autumn, often nearly year-round in frost-free climates.

Foliage

Evergreen. Rough, hairy green leaves, triangular to heart-shaped and sometimes lobed; shape varies between forms.

Growth

Fast

Care needed

Low

• Pollinators
• Drought tolerant
• Heat tolerant
• Wildlife

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Very tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1 ft (0.3 m)

2. After 1 year

   1.5 ft (0.45 m)

3. After 2 years

   2 ft (0.6 m)

   full size

About 2 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Native to

the US

Invasive in

Australia

In the garden

Spreads vigorously: plan to contain it.

Growth rate

Fast

• Plant after frost in full sun, leaving room for stems to spread.
• Water newly planted specimens until rooted, then let the soil dry between waterings.
• Use little or no fertiliser; rich feeding encourages sprawling growth.
• Keep mulch thin and away from the crown to discourage rot.
• Pull unwanted seedlings and trim stems before they cover neighbouring plants.

Pruning. Lightly trim long stems during the growing season to keep plants compact, and remove spent flowers if you want fewer seedlings. After frost, wait until spring growth appears before cutting away dead stems.

Spring

In perennial plantings, remove frost-damaged stems once new growth is visible.

Late spring

Sow seed or plant young plants after frost, once the soil has warmed.

Early summer

Check establishment watering and lightly trim shoots that extend beyond their allotted space.

Summer

Water during prolonged drought and remove unwanted seedlings.

Autumn

Leave some seedheads for birds where self-seeding is acceptable; otherwise remove them.

Winter

Keep perennial plants well drained; in cold climates, remove annual plants after frost kills them.

• Use low-growing forms as a loose groundcover on sunny coastal banks.
• Combine with pink muhly grass and blanket flower for a drought-tolerant, informal border.
• Let stems spill over a low retaining wall or the edge of a large container.
• Plant in sunny wildlife gardens where flowers can feed insects and seedheads can feed birds.

Garden styles it suits: Coastal, Florida subtropical, Wildlife garden, Pollinator garden, Desert / xeriscape and Dry gravel garden.

Plant it with: Blanket flower, Pink muhly grass, Lanceleaf coreopsis, Sea oats and Rosemary.

Wildlife: Flowers attract bees, butterflies and other pollinating insects. Seedheads provide food for seed-eating birds.

• Root and crown rot in wet soil: improve drainage or replant in a raised, sandy bed; avoid frequent irrigation.
• Sparse flowering and floppy stems: move into full sun and stop high-nitrogen feeding.
• Leaf spots or powdery mildew: improve airflow, water at soil level and remove badly affected foliage.
• Frost damage: grow as an annual outside its hardy range, or wait until spring to assess surviving crowns.

Not known to be toxic to people, cats, dogs or horses. No part is recognised as a significant poisoning hazard, although the rough foliage may irritate sensitive skin.

Where it spreads. Can spread vigorously by seed and sprawling stems in warm, sandy gardens. It is naturalised and regarded as an environmental weed in parts of Queensland and New South Wales, Australia; avoid planting near coastal dunes or bushland there.

• Common sunflower (Helianthus annuus)

  Usually has a taller, upright annual habit, larger leaves and larger flowerheads; beach sunflower is generally lower, more spreading and smaller-flowered.

• Swamp sunflower (Helianthus angustifolius)

  Has long, narrow leaves and tall upright stems, usually flowering in late summer and autumn rather than over a long warm-season period.

• Silverleaf sunflower (Helianthus argophyllus)

  Has conspicuously silvery, densely hairy foliage and a taller upright habit, rather than the greener leaves and spreading habit typical of beach sunflower.

Helianthus comes from Greek words for sun and flower, while debilis means weak or slender, referring to the stems.

Propagation. Sow seed in warm conditions after frost, or start under cover before the last frost. Take softwood cuttings during active growth to preserve the habit of a selected plant; seedlings can vary.

Accepted botanical name

Helianthus debilis

In the US and Canada

Native in the lower 48 states.

Native range

Alabama, Connecticut, Florida, Georgia, Louisiana, Maryland, Masachusettes, Michigan, Mississippi, New Hampshire, New York and North Carolina.

Measured

Soil pH 5.2 to 7.2.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.