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Shasta daisies -- I'm thinking yes, they should be deadheaded, but will bow to others' experience.
Gloriosa daisies -- Not sure?
Black-eyed Susan/Rudbeckia daisies -- Not sure? I do want at least some of them to set seed, but should I deadhead the rest and if so, will they bloom again this summer?
I'm chuckling as I write this, as Black-Eyed Susans have long been on my "something I regretted planting" list because they seem to pop up everywhere in subsequent years. But where I have planted their seeds (last year, so they are blooming this year), they are the perfect plant. And I think I can control their spread. I know! I'm probably delusional. They certainly are gorgeous and cheerful this year, along with the Gloriosa flowers.
I used to have white daisies and they were OK but then the black eyed Susans showed up and I preferred the color, so I let them stay. Now, like you, I'm wondering how much I can control them as they are - can you guess? - popping up everywhere. But I have reasonable control over the wild blackberries and the baptisia (working on a native garden) and it never occurred to me to deadhead the Susans, so I vote yes, do it, and let me know if it helps. I'm going to do it, too, and see if they pop up in fewer places next year.
Bird lovers might tell you not to deadhead perennials like coneflowers, black-eye susans, and sunflowers, as the birds will come get the tiny seeds out of the spent heads. But maybe if you left the heads on the ground nearby they could figure it out.
Bird lovers might tell you not to deadhead perennials like coneflowers, black-eye susans, and sunflowers, as the birds will come get the tiny seeds out of the spent heads. But maybe if you left the heads on the ground nearby they could figure it out.
I am hoping deadheading will encourage a second bloom. And then I will leave those blooms to go to seed and the birds will be happy. Of course, I will probably be cursing next year when I am trying to rip out all the black-eyed Susan "volunteers".
I used to deadhead my black-eyed Susans and would get more blooms, sometimes, if they bloomed early and frost was late I might get 3 sets of bloom time.
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They certainly are gorgeous and cheerful this year, along with the Gloriosa flowers.
And then I will leave those blooms to go to seed and the birds will be happy. Of course, I will probably be cursing next year when I am trying to rip out all the black-eyed Susan "volunteers". 
