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Spacing: 18-24 in. (45-60 cm) 24-36 in. (60-90 cm)
Hardiness: USDA Zone 6a: to -23.3 °C (-10 °F) USDA Zone 6b: to -20.5 °C (-5 °F) USDA Zone 7a: to -17.7 °C (0 °F) USDA Zone 7b: to -14.9 °C (5 °F) USDA Zone 8a: to -12.2 °C (10 °F) USDA Zone 8b: to -9.4 °C (15 °F)
Propagation Methods: By dividing the rootball From seed; direct sow outdoors in fall From seed; winter sow in vented containers, coldframe or unheated greenhouse From seed; stratify if sowing indoors From seed; sow indoors before last frost From seed; direct sow after last frost
Seed Collecting: Allow seedheads to dry on plants; remove and collect seeds
On Jun 21, 2008, VanInDallas from Dallas, TX wrote:
Pictures don't really do it justice. I just discovered this plant a month ago at the Dallas Arboretum and had to track one down. The lady at the native plant nursery I bought it at said it will need supplemental water in our area. She said where she sees it really thrive is in drainage ditches in East Texas, so obviously it will tolerate soggy conditions. East Texas is also acidic whereas Dallas is aklaline so I mixed in peat moss to help acidify and retain water. I'll let you know in a year how it turned out.
On May 28, 2006, rosemontgolden from Stockton, NJ wrote:
This plant is a stunning success in my difficult conditions - an overgrown field I'm turning into a wet prairie. Even though the soil is heavy clay, and very wet throughout winter and spring, Rudbeckia maxima came through with flying colors, grew significantly in size in one season, and remains attractive, with unblemished leaved of large size. Because of the difficult growing conditions - I'm planting within the matrix of native plants - I only planted two Rudbeckia maxima. Now that I've seen the result, I'm scattering several more in a naturalistic, random pattern. I should add that these plants were totally untouched by my large deer population.
On Sep 23, 2004, PurplePansies from Deal, NJ (Zone 7a) wrote:
This plant will germinate without stratification ..... seeds should be covered lightly.... light aids germination...... this is how I sowed mine.... stratification can be used if your plants don't come up...... I have to wait for them to get big now before I can say if I like them or not....... :)
On Aug 9, 2004, gonedutch from Fairport, NY wrote:
This is a spectacular turkscap-like flower that blooms in August in my western New York garden. It seems not to be affected by either excessive rains or droughts. It makes a great show with r. 'Herbstsonne' (see my image).
On Jan 5, 2001, Grits from Pineville, LA (Zone 8b) wrote:
R. maxima is an eye-catching perennial native to Arkansas, Louisiana and into Texas. It forms attractive clumps or heads of foliage low to the ground; individual leaves are "paddle-shaped," 18" long and 3" to 4" wide. Out of the clumps of bluish-green leaves, tall architectural flower stems shoot up to the sky like rockets in mid to late summer and explode into rays of golden yellow.
Six to seven foot stems support bold drooping flowers that
resemble soggy sombreros.
It is a herbaceous perennial in USDA hardiness zones 6 to 8, and grows best in full sun, rich and moist soil.
Regional...
This plant has been said to grow in the following regions:
Vincent, Alabama Carrollton, Georgia Abita Springs, Louisiana Mandeville, Louisiana Stratham, New Hampshire Stockton, New Jersey Fairport, New York Cincinnati, Ohio Fort Jennings, Ohio Portland, Oregon Coopersburg, Pennsylvania Inman, South Carolina North Augusta, South Carolina Arlington, Texas Dallas, Texas Fort Worth, Texas Oakhurst, Texas Shepherd, Texas Arlington, Virginia Roanoke, Virginia
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