PlantsHelianthus→Swamp Sunflower (Helianthus angustifolius)

Common names:
Give a thumbs up Swamp Sunflower
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General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Water Preferences: Wet Mesic
Soil pH Preferences: Moderately acid (5.6 – 6.0)
Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Minimum cold hardiness: Zone 5b -26.1 °C (-15 °F) to -23.3 °C (-10 °F)
Plant Height: 6 to 8 feet
Plant Spread: Forms clusters to 6 feet in width.
Leaves: Evergreen
Other: depending on zone either evergreen or deciduous
Fruit: Edible to birds
Flowers: Showy
Flower Color: Yellow
Bloom Size: 1"-2"
Flower Time: Late summer or early fall
Late fall or early winter
Underground structures: Taproot
Suitable Locations: Bog gardening
Uses: Cut Flower
Will Naturalize
Suitable as Annual
Wildlife Attractant: Bees
Resistances: Deer Resistant
Humidity tolerant
Propagation: Seeds: Suitable for wintersowing
Sow in situ
Can handle transplanting
Propagation: Other methods: Division
Miscellaneous: Goes Dormant


The Top 25 Water Garden Plants, Selected by ATP MembersThe Top 25 Water Garden Plants, Selected by ATP Members
By dave on March 15, 2014

Here's a report of the most popular water garden plants from our database!

(Full article14 comments)
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Posted by gingin (Fountain, Florida - Zone 8b) on Dec 9, 2011 3:52 PM

This plant is a VERY prolific self sower! I would suggest planting it somewhere you won't mind if it tries to take over. Roots run deep. New plants are easiest to pull in the spring when they first appear. Otherwise, be prepared to dig.

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Plant Events from our members
flaflwrgrl On June 17, 2016 Obtained plant
From Betsy in Texas.
flaflwrgrl On June 17, 2016 Miscellaneous Event
Planted east field.
piksihk On October 25, 2020 Bloomed
piksihk On October 10, 2019 Bloomed
piksihk On October 6, 2015 Bloomed
greene On September 25, 2015 Obtained plant
In bloom now. This must be very happy in my garden as it has grown to over 12 feet in height.
lovesblooms On August 9, 2015 Bloomed
lovesblooms On April 20, 2015 Seeds germinated
lovesblooms On January 29, 2015 Seeds sown
paleohunter On October 20, 2021 Potted up
paleohunter On May 30, 2021 Obtained plant
» Post your own event for this plant

Discussion Threads about this plant
Thread Title Last Reply Replies
Sunflower? by skopjecollection Jun 18, 2020 10:20 AM 2
Blank Canvas by texasgreenthumb Mar 20, 2020 2:48 PM 9
Joe Pye Weed by ldybgskrgrl Sep 16, 2019 12:18 PM 1
sunflowers by cwo2rm Jun 22, 2019 4:45 PM 14
Has anyone renovated their entire yard? by SkipNJ Jan 29, 2021 11:42 PM 27
This was given to us, but I have no idea what it is by nestof3 Oct 9, 2017 3:38 PM 22
Banner for November 9, 2016 by greene by greene Nov 10, 2016 1:02 PM 7
Grass by jnicholes Oct 30, 2016 3:01 PM 18
What is this yellow plant? by Hemophobic Oct 3, 2015 2:12 PM 4
Daily gardening thread for everyone by keithp2012 Jan 24, 2022 9:51 AM 24,708

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