How often do zinnias need to be watered?

I'm doing a science experiment with zinnias, and I need to know how often they need to be watered. Thanks in advance!

How often do zinnias need to be watered?
Zinnias are very hardy, but they still need care. If they are growing in the ground, don't let them go more than a week without getting any water. If you are growing them in pots, do not get the soil "wet" but keep it damp. They may need a little fertilizer if grown in pots but not too much. Maybe something like 5-10-10 or 6-12-12.











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