How might you be able to tell if a plant in a garden needs more water?

The first and most simple way is to stick your finger into the soil about an inch or so, if it is moist then your plant is well watered. If you find that your finger comes out dry then you may want to water your plants

Explanation:

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the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.