What are optimal growth conditions for Marigolds?

please describe temperature, humidity, amount to be watered, how often to be watered. 10 Points will be given for best answer..please leave your sources
What are optimal growth conditions for Marigolds?
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Reply:These are the best plants that survive any temperature from 40-100degree's as long as when dry they are watered every two days will do it, don;t need to feed and the seeds after dried fall to ground and make more plants and also take the dried flower and save seeds which are under dried flower for next year, plant near vegetables and great to keep away bad insects from veggies. i've had all variaties large and small , this year I grew French vanilla marigolds and are beautiful and bulky these are like a bouquet of flowers.
Reply:I have grown marigolds from seed every year and from experience they seem to grow in most conditions with the exception of very cold and frosty places. They can withstand longish periods of drought as long as they are well established in the first place.

I normally plant mine out in the garden in Spring, (after sowing the seeds a couple on months before and keeping them in a greenhouse), I remove the first flower off each plant to help promote stronger and bushier plants. For the first couple of weeks I water them well about every three - four days if it is particularly warm or sunny after that I gradually reduce the watering. (Always give them a good soaking if you have to water them as this helps the roots to go deeper and develop).

One thing to remember is to regularly dead head the flowers as this helps them to produce more, I normally complete this chore every couple of days.

Apart from that they pretty much look after themselves.

Good luck.