When you
specialize in one particular plant, it’s easy to fall into a gardening rut.
Several
years ago when we were living in Maryland, I focused on roses and companion
plants that looked good with roses. I wasn’t very interested in experimenting
with anything new.
Now that
I’m creating a new garden in the mountains of North Carolina, I see I’ve been
missing out on some really interesting perennials. I inherited a few daylilies
and am just beginning to appreciate their beauty and usefulness.
I was
also intrigued when a coneflower popped up in an area where I’d sown wildflower
seeds one summer. It was just an old fashioned Echinacea purpurea but it looked quite elegant amid a group of
oxeye daisies.
I wondered
why I hadn’t noticed this appealing flower before.
The humble Echinacea has some fancy new cousins
Hardy,
attractive, and easy to grow, these popular American wildflowers have long been
a staple of the perennial border both here and in Europe. Nine species are
native to North America and grow mainly in the central and southeastern U.S.
Beginning
in the mid-1990s, a number of enterprising plant breeders began making crosses
between several varieties of native coneflowers in an attempt to make a good
thing even better.
The
result has been a dizzying array of new hybrids in a rainbow of delicious
colors, along with a wide choice of flower forms including double blooms.
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'Milk Shake'
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Keeping
up with all these new and unusual coneflowers is about as difficult as figuring
out which of a multitude of rose introductions to try. The number of choices
and names boggles the mind. It can also be confusing since so many of the new
introductions look alike.
Should I
get a ‘Milkshake’ and ‘Tomato Soup’? Or a ‘Marmalade’ and 'Merlot'?
And once
I decide on which of the new beauties to try, should I assume it will be as
easy-care as the old standby?
The coneflower controversy
The
traditional purple coneflower has been a Top 10 perennial for decades. It
self-seeds so even when the original plant is just a memory, true seedlings
will have taken its place.
Unfortunately,
many of the new introductions don’t perform as dependably in the garden.
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'Raspberry Truffle'
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Many seem
to disappear after a year or so, and others never bloom. Some fade quickly in
the heat. Some turn black with too much rain. A number of varieties don’t set
seed, and others produce strange seedlings.
It’s a
disappointing result after a great deal of hype and high expectations.
Anecdotal
evidence also suggests that the success rate for certain new coneflowers may
depend on the region where they are grown and the growing conditions.
When I
first started writing about the new cultivars, I mentioned a three year study
conducted by the nonprofit Mount Cuba Center in northern Delaware. As a result
of the study that concluded in 2009, ‘Pica Bella’, ‘Fatal Attraction’ and
‘Fragrant Angel’ were named top performers.
Mount
Cuba has just completed a second three-year study. The first trial included 48
cultivars and the second evaluated 75 entries for general vigor, abundance of
bloom, length of bloom and growth habit.
An
interesting aspect of the second trial is they also kept records on which
pollinators were likely to visit coneflowers.
And the
winner? Once again, ‘Pica Bella’ led the way and was also named a preferred
pollinator plant. Other top performers included ‘Pink Sensation’, ‘Snow Cone’
‘Fragrant Angel’, Kismet ‘Intense Orange’, Kismet ‘Raspberry’, and ‘Balsomcor’
Sombrero. The study can be seen its entirety at https://mtcubacenter.org/trials/echinacea-mid-atlantic-region/
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The big winner 'Pica Bella'
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Interesting,
the trial discovered that bees and wasps made up the majority of pollinator
visitors, with butterflies comprising only 5% of activity.
The trial
also took a look at double-flowered coneflower varieties and concluded that
they may look sensational at the garden center, but when it came to aiding
pollinators, they were of little or no help.
Another
interesting five year study is wrapping up at the RHS Garden Wisley, and I will
pass on the results when available. A couple of things are already known:
Echinaceas do not like heavy mulches, heavy soils or too much water. And double varieties may look impressive in sunny, dry weather but tend to collapse in the
rain.
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Kismet 'Intense Orange'
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I’ve tried a few
coneflowers in my North Carolina mountain garden (My 'White Swan' didn't make it) but have not yet found one
that seems happy in my "rain forest". But there are so many eye catching
varieties out there, I will be tempted to keep trying and perhaps just treat them as annuals.
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'White Swan'
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The fact that
there are so many unique and enticing plants out there is exciting news for
gardeners.
But before we
all go coneflower crazy, we need to separate the dazzlers from the duds.
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