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Marcus, Joseph A.
Rudbeckia maxima Nutt.
Giant coneflower, Great coneflower, Giant Brown-eyed Susan
USDA Symbol: ruma3
USDA Native Status: L48 (N)
Giant brown-eyed Susan has clumps of silvery-blue foliage that give rise to stately flower stalks. The flowers have intense yellow ray flowers that dangle from tall brown centers. It should be cut back to the base after blooming to keep tidy and be planted in mass for best effect in landscapes.
Plant CharacteristicsDuration: Perennial Habit: Herb Size Notes:
3-6 feet Leaf:
Fruit: Size Class:
Bloom InformationBloom Color: Yellow
Bloom Time: Jul , Aug , Sep
, TX Native Distribution:
L48(N) Native Habitat:
Found in moist open places. Forming beds in low ground, sandy or silty soils; east Texas west to East Cross Timbers. Seems pretty drought resistance despite its swampy origins.
Growing ConditionsWater Use:
High Light Requirement:
Sun , Part Shade Soil Moisture:
Moist CaCO3 Tolerance:
Low Drought Tolerance:
Low Conditions Comments:
The flowers have intense yellow petals that dangle from tall brown centers. Clumps of silvery-blue foliage give rise to stately flower
BenefitUse Ornamental: Makes a good cut flower.
Conspicuous Flowers: yes
Interesting Foliage: yes
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National Wetland Indicator Status
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1
(Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here
for map of regions.
Wildflower Center Seed BankLBJWC-1066
Collected 2011-07-23 in Harrison County by Lady Bird Johnson Wildflower Center
Record Last Modified: 2013-09-11
Research By: TWC Staff