Answer: It is often difficult to get seedlings going in the middle of summer because it is so hot -- not only the air but also the soil -- and this causes stress or prevents germination altogether. And, the plants need to reach a certain maturity before they begin to bloom so there is a time lag. You might try cosmos, it is heat loving and might still germinate in such warm soil. Cutting sunflowers might also work. Your pernenials and biennials would do better planted in late summer.
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