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Plants and Flowers Encyclopedia

Watering plants

All plants need water, some a very small amount, and others a lot. We often use cold tap water to water our plants, but that can be harmful for 2 reasons. The temperature of cold tap water can be too low for some plants, some plants are sensitive to it, and the amount of lime in the water can also be a burden on the plant, so it is better to pour with lime free water or rainwater.

Over-watering is the biggest cause of the death of houseplants. When a houseplant gets too much water, the roots suffocate in it and can hardly absorb any nutrients. It is therefore advisable to either let the plant drain the water, e.g. through a leaking pot to a sub pot, or simply pay close attention to the amount of water that is poured.



  • All plants use water
  • Different plants have different water needs
  • The amount also depends on the amount of sunlight and temperature

Factors of the required quantity

In order to determine how much water a plant needs, it is necessary to look at different properties of the plant, because it differs quite a bit when these properties differ. To determine the quantity, we look at the following points:

Plant Dimension, Pot Dimension, Soil Type, Place, Season and Temperature.

The sizes of a plant

Your plant has a certain size, both in terms of branching and the leaves. The larger the plant, the more water it consumes. It also differs a lot depending on the leaf surface, because there is evaporation on the leaf surface.

The size of the pot

The size of the pot, the height and the width, determine how much soil is around the roots. Earth absorbs water, and the more soil, the more water can be absorbed. So determine the amount of water based on the size of the pot as well, but the rooting-through of the plant also matters, the more the plant is rooted, the less soil is around the roots, the less water can be absorbed.

The type of soil / potting soil

Different types of soil have different capacities to absorb water and let water down. An example of soil that absorbs a lot of water and slowly releases it is Vulcastrat.


The water consumption of a plant also strongly depends on the location of the plant. A lot of light causes more water consumption and evaporation, so more water is needed. A higher ambient temperature also ensures this, or when a plant is in a draught, more is consumed.


The seasons also have an effect on the water consumption of a plant. In winter many plants are in a kind of resting position, so they simply consume less and also grow less. Also because of the lower ambient temperature and less sunlight a plant consumes less water. In summer, on the other hand, in a warm place, a plant can use a lot of water again.

Heating and air conditioning

Heaters and air conditioning have an effect on the humidity of a room. A plant in a dry room will consume more water.

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Determination of the amount of water

You can determine how much moisture your plant needs using the above factors and that you can feel with your finger how moist the soil already is.

Does the soil feel dry? Will the surface become lighter in colour? Give the plant a lot of water.

Does the soil feel slightly moist? Does some soil stick to your finger? Give water on average.

If the soil feels more than moist, do not water it to little.

If the soil feels very wet, drain the soil with holes in the soil and a container, because you run the risk that the roots will suffocate and rot.

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How often should the plant be watered?

There are different types of plants with different types of water needs. First determine which category your plant falls into.

Always humid - Should your plant always be humid? Water every day in warm environments and in colder environments or once every 3 days during the winter season.

Occasionally dry - Some plants, such as yuccas and agaves, may need to be a little dry from time to time, but they also consume less water. Do not water until the soil has been dry for 3 days.

Usually dry - Other plants, such as Sansevieria's, Cacti usually need to be dry. They use very little water, and have a chance of weakening when they get water more often. In summer the soil needs to be dry for 3 days, and in winter for 3 weeks.

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Application of Hydroponics

Hydroponics is a system that makes watering easier. It means that a water meter is placed in the plant combined with a moisture-retaining soil filling, such as Vulcastrat. The meter indicates when the plant needs water again, and when you water, it indicates when you have given enough, so this system is ideal for making watering easy, so take a look at our range of water meters!

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