Large Coneflower (Rudbeckia maxima) in the Black Eyed Susans Database

Common names:
Give a thumbs up Large Coneflower
Give a thumbs up Giant coneflower
Give a thumbs up Cabbage Leaf Coneflower
Give a thumbs up Great coneflower
Give a thumbs up Giant Brown-eyed Susan
Give a thumbs up Great Rudbeckia Dumbo's Ears

General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Perennial
Sun Requirements: Full Sun
Full Sun to Partial Shade
Water Preferences: Mesic
Minimum cold hardiness: Zone 6a -23.3 °C (-10 °F) to -20.6 °C (-5 °F)
Maximum recommended zone: Zone 8b
Plant Height: 4-6 feet
Plant Spread: 18-36 inches
Leaves: Semi-evergreen
Fruit: Showy
Edible to birds
Flowers: Showy
Flower Color: Yellow
Flower Time: Spring
Late spring or early summer
Late summer or early fall
Underground structures: Rhizome
Uses: Groundcover
Cut Flower
Will Naturalize
Wildlife Attractant: Birds
Propagation: Seeds: Stratify seeds: if starting indoors
Suitable for wintersowing
Sow in situ
Propagation: Other methods: Division
Stolons and runners
Awards and Recognitions: Other: 2011 Oklahoma Proven! plant selection

Zone 9b.

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Posted by tabbycat (Youngsville, LA - Zone 9b) on Jun 20, 2018 7:55 PM

It's time to cut the dried cones after they flowered all of April and May. Cutting these 1st seed heads encourages the plants to make a 2nd flush of flowers in late summer/fall. I also will be planting some of these seeds for late summer/fall sprouts of new plants for some friends and family to have flowers next spring.

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Posted by ILPARW (southeast Pennsylvania - Zone 6b) on Jul 2, 2018 8:57 PM

This tall species is native to east Texas, southeast Oklahoma, Arkansas, northern Louisiana, and a spot in South Carolina. It rises upright to about 7 feet high with 2 inch long brown noses above the yellow petals. It has thick, waxy, blue-coloured foliage. It likes full sun and moist soil. North Creek Nursery, a wholesale native plant nursery in Landenberg in southeast Pennsylvania, sells it. I have never seen this species until I saw it in northern Delaware. It spreads slowly by rhizomes. It is good to deadhead the flowers for longer summer bloom. If some stems fall down, it may need some staking. It is propagated by seed or root cuttings or division. It grows in USDA Zones 5 to 8.

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Plant Events from our members
MrsBinWY On April 13, 2019 Potted up
MrsBinWY On January 28, 2019 Seeds germinated
MrsBinWY On January 20, 2019 Seeds sown
~9 viable-looking seeds from Samlav's 2017G. Per TC: 68 degrees. If no germination in 3-4 weeks, move to 24-39 degrees for 2-4 weeks.
MrsBinWY On February 8, 2017 Seeds sown
milk jug, room temp, seeds & chaff from tabbycat; gave up on these 5-26-17
tabbycat On March 20, 2020 Bloomed
1st flower on 3' plant by mailbox
tabbycat On May 7, 2019 Bloomed
1st flower of 2019 is on 4' stem.
tabbycat On March 1, 2019 Plant emerged
Mild Winter so Springs new leaves have arrived.
» Post your own event for this plant

Discussion Threads about this plant
Thread Title Last Reply Replies
Panicum Heavy Metal location by AlexUnder Jun 8, 2020 7:42 AM 12
Two wild plants in Georgia forest one a weed and a tree by Islandveg Mar 26, 2020 7:19 AM 1
HAVE: Other perennials to trade by lovesblooms May 15, 2019 7:59 PM 8
1 weed 1 beauty needs ID by Fredmertz Jul 14, 2018 8:33 PM 2
Tall prairie rudbeckia by pdermer1x Apr 21, 2018 11:32 PM 3
What's Blooming - Photos and Chat. by NJBob Sep 21, 2020 4:35 AM 2,653
Plant identification by Samlav Oct 23, 2017 6:37 PM 2
Any idea what this odd looking plant might be? by JulieB Jun 24, 2017 12:55 AM 18
Not much to go on by MISSINGROSIE Oct 20, 2016 9:44 PM 6
Southeast Month in Bloom - June 2016 by Danita Jul 1, 2016 1:39 PM 74

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