What to do with Petunas and Marigolds for winter?

I live in New York City and I have Petunas and Marigolds out on my balcony. Should I keep watering them or are they gonna die anyway cause of the cold?

What to do with Petunas and Marigolds for winter?
Do what I do, save the seeds in a small jar with holes in the top. Replant the seeds next year. I have a large ground bed of petunias, same ones for the last 3 years. I'm in northern Wisc. I hay cover this bed as there are tulips also in it. Most petunias do come back (reseed) the next year, marigolds are more finicky, very few make it through the winter. Another volunteer flower, snapdragons, any variety, self seed back the next year, or you can save their seeds also.
Reply:They are already dieing if you live in NY and they are outside. You could bring them inside and fertilize well. That will keep them going until you get tired of them
Reply:The flowers that you have are annuals and will die at the first freeze. If the weather where you are continues to be unusually warm water them, then after the first freeze clean them out.
Reply:marigolds collert the seeds
Reply:The Petunias may be able to live indoors as house plants (I am not sure) but the Marigolds are cyclical - they will only last a season no matter what you do with them, and I expect the Petunias are the same. Collect the seed heads, since they both will re-seed readily and put them in a container that stays kind of moist on the balcony. In the spring, spread out the seeds when the soil in he pots warms up and you are ready to start again. The plants themselves will not survive outside in the winter - you can water them until they die or just remove them once you get tired of watering them or they look like they are unhappy from the cold.