by 
The Curious Bag
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<h4 class="dechead">On One Hand: They're Adaptable
Most plants will cope fairly well if you water them when the dirt near the roots begins to dry out. Sticking your finger an inch or two into the soil will allow you to determine whether the soil near the roots is drying out or not. If the soil doesn't feel damp, it's time to water.
On the Other: They're Picky, Too
The amount of a water that a houseplant needs can vary widely between plant species. Cacti and succulents like aloe vera, for example, can go much longer between waterings than other plants. Some plants, like so-called potted shamrocks, should not be watered at all during their dormant stage.
Bottom Line
The only way to be sure that your plants are receiving the appropriate amount of water is by familiarizing yourself with the plant variety that you own. Plants typically come with a small insert that details their watering needs, or you can look online for this information. If you can't find information about your houseplant in these ways, examine its roots. Plants with thick, coarse roots can usually go for longer periods of time without water than those with fine, threadlike roots.
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