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Guttation usually occurs as a consequence of a combination of high root pressure (which may be caused by different factors) and a low evaporation rate/too high humidity. This often occurs just after sunrise when the plant becomes active and the humidity is high.  

Guttation indicates that the tension between the cell wall and the cell content, or the turgor or cell tension is in order. Guttation only takes place when the cell vacuole is completely filled, because the plant will always first replenish any water shortages in the plant cells. Only then guttation takes place.  

Guttation is basically harmless, provided that the water drips from the leaf. If this does not happen and the water vaporizes on the leaf, then this may have a harmful effect because a layer of sugars and salts will remain on the leaf surface as small white spots. This is predominantly disadvantageous for the ornamentals sector. Another disadvantage of moist remaining on the leaf is that this may lead to the development of mold. Mold likes humid conditions. 

In some cultivations though, like strawberries, Guttation has a positive effect, because it ensures that calcium, that can only be transported through the plant via the plant's internal water flow, ends up at the top of the plant as much as possible.

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