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I live in a very hot area ofI live in a very hot area of california most days range from 90-115 summers. My sunflowers LOVE the heat. So I say as long as you water mornings or nights and do not overwater you're fine. Crush the eggshell a little and plant in your garden, you don't have to wait until next year. With the right conditions; water, nutrients, etc they grow fast and strong. Hope this helps <3 Happy gardening. Ps. Be sure not to over crush the shell so that you damage roots. You just want to lightly crack so the roots can push against it and grow through. Make sure the hole you dig in your garden is 2x the size of the egg shell and 2x as deep. This ensures that the roots have soft soil to spread out in without having to exert so much energy on growing.

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