It is a common theme. Coreopsis was a much simpler group of only a few specie and cultivars in the 1980s. There are now too many hybrids and cultivars to keep track of. They have been bred so extensively that they do not produce viable seed like the old fashioned types that can self sow so nicely, and were more closely related to the unimproved specie that would be found in the wild.
Breeding did more than expand the range of floral color and form. It combined the more impressive flowers with the resiliency of the toughest of perennial specie. Because they are sterile, some of the modern hybrids may not need to be deadheaded like more traditional types. Although tougher modern hybrids can capitalize on the sustainability fad, they can not proliferate and naturalize.
Coreopsis blooms in summer and autumn. The small daisy like flowers can bloom yellow, orange, red or pink, but traditional bright yellow is still the favorite color. Most cultivars are less than two feet tall and wide. A few can get nearly twice as tall. The most compact cultivars are only about half a foot tall. Coreopsis wants good sun exposure, and will bloom less and likely mildew if shaded.
Tony Tomeo 
I’m not a huge fan of the new cultivars – really like the single, bright yellow-orange blooms that spread so easily around the garden. Does ‘sterile’ mean useless to pollinators? If so, why bother?
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I think that ‘sterile’ means that it was bred way too much, and is not merely an aberration of nature.
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https://xerces.org/2017/11/21/picking-plants-for-pollinators-the-cultivar-conundrum/
Someone else sent this article that you might find interesting.
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That is a really great article! And it answers my question – double Coreopsis are not useful to pollinators.
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I have this one Tony and today I spent time splitting the clumps and spreading them around. I never knew they came in other colours
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The other colors are not very common, at least here. I think that those who appreciate coreopsis expect them to be yellow.
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I like the cheery yellow
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I think that is why it continues to be the most popular.
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One of our native species sometimes is given the common name “golden wave.” In spring, it overspreads Galveston Island (including a group of historic cemeteries) and other barrier islands. It’s simply glorious.
You might be interested in this article about the effects of plant breeding on pollination and such.
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Thank you. That is particularly interesting article because someone had just asked about it. I will forward it.
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So cheerful….just planted some in the garden, great impact for a few plants…
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The older types are so traditional too. I prefer the single flowered types to the fluffy double types in the picture.
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