Jonnie, did you start them late? Cosmos needs short days to bloom. If you started them late, the days have become long, so it will actually take them longer to bloom. They will more likely bloom when the days are starting to get short again. Cosmos are sensitive to day length. If you search the internet for "cosmos day length" you will find a lot of information related to this phenomenon.

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I think the others are right. It took mine quite a long time to bloom. I finally have a few now that it's drier. I haven't been fertilizing them, but we've had record rainfall until this month. Hope you get blooms before long.

On that one it is 1050 ppm and 6.5 ph although I have to admit I'm not sure how to read my meter that well yet, that ppm reading is on the x500 scale. I can say I'm using GH Flora series mixed per the specialty mixes for tomatoes on their site and it is: 2 micro, 1 1/2 Gro, 1 Bloom, each being tsp per gallon.