Swamp / Narrowleaf Sunflower - Helianthus angustifolius

Category: Perennial

Common Name: Narrowleaf Sunflower

Scientific Name: Helianthus angustifolius

Sun Conditions:Full Sun

Soil Conditions: Moist to Wet (tolerates average soil once established)

Height Range: 5-8 ft

Width Range: 2.5-4 ft

Growth Habit: Upright

Growth Rate: Medium

Bloom Color: Yellow

Bloom Time: Late Summer to Fall (September-frost)

Seed/Fruit Production: Yes

Foliage Color: Green

Hardiness Zones: 5 to 9

Evergreen: No

Deer Resistant: Moderate — reports conflict (Gardenia/New Moon list it deer resistant; US Perennials says partially; deer are said to eat it in the wild)

Forage: Seeds relished by goldfinches, songbirds, quail, grouse and doves; foliage/seeds eaten by deer in some areas

Poisonous: No known toxicity

Wildlife Value Highlights: Rain gardens, pond/wet-area margins, back of borders, meadows, coastal plantings (salt tolerant); may need staking or a pruning in early summer to reduce height

Ecological/Landscape Use: Last big nectar source of the season — fuels migrating Monarchs and other butterflies, bees, wasps and flies; seeds eaten by goldfinches, songbirds, quail, doves and small mammals; supports specialist Helianthus bees

Lepidoptera Supported by Family/Group: Host for Silvery Checkerspot, Gorgone Checkerspot, Bordered Patch and Painted Lady butterflies

Lepidoptera Supported by Species: Chlosyne nycteis, Chlosyne gorgone, Chlosyne lacinia, Vanessa cardui

For More Info: https://plants.ces.ncsu.edu/plants/helianthus-angustifolius/