I have a few patches of "Goldsturm" Black-Eyed Susan and they have bloomed
for 2 years now.
I planted them in the spring of 2002 from seed (McKenzie seeds).
This year I noticed that one patch had a slightly mutated version of the
"Goldsturm" Black-Eyed Susan. It was the same flower shape but the petals
were half yellow (edges) and half red.
Anybody heard of such mutation?
If you planted them from seed, they are NOT pure Goldsturms. They are
strains. Goldsturms only propagate through cuttings. In order to get
viable seed, they have to be hybridized with other types of Rudbeckia.
The flowers you end up getting from these are Goldsturm hybrids. They
resemble Goldsturms, but they are not the "true" Goldsturm. The
flowers on these plants WILL show mixed blooms.
Examine the seed packets for these and they should say "strain" on
This year I planted two Rudbeckia types from Park Seed: Rudbeckia
fulgida var sullivantii Goldsturm Strain, and Rudbeckia hirta Indian
Summer. The "Goldsturm Strain" plants grew very small with few
flowers, while the hirta Indian Summer grew very robustly and tall
with tons of big blooms.
I think it's best to grow the annual vanities of Rudbeckia (like
hirta) if you want to grow from seed.
It's my understanding that the "Gloriosa Daisy" Rudbeckias were first
bred by Burpee Seed in the 1950's.
What surprised me was that the patch the new one was in had grown last year
and there was no red in them...
I grew mine from the Mackenzie seeds (hirta variety).
Thank you for your explanation and I love your site and all the pictures
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