How much water need in ginger plant?

Ginger needs a lot of moisture while actively growing. The soil should never dry out. Don't overwater, though, because the water that drains away will take nutrients with it.
Ginger loves humidity. If you have problems with dry air then regular spraying and misting might help. Dry air can cause problems with spider mites. But that's rather a problem for people who try to grow ginger out of its range and indoors. A sheltered, moist spot in a warm climate will provide enough humidity.
If you are growing ginger in the ground mulch it thickly.
It helps to keep the ground moist, it helps feed the ginger as the mulch breaks down, and it also keeps down weeds.
(Ginger is a slow growing plant and easily overgrown by others.)
Towards the end of summer, as the weather starts cooling down, your ginger will start to die back. Reduce the water, even let the ground dry out. This encourages the ginger to form rhizomes. Once all the leaves have died down your ginger is ready for harvest.

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