What Water to Use for Hydroponic Plants: A Comparison of Various Types of Water for Hydroponics

Abstract:The most important part of hydroponic plants is the water. What kind of water is best for hydroponics? After extensive comparison, we have arrived at the following ranking of water types for hydroponics from best to worst:Mineral water/purified water > magnetized water > rainwater > river/lake water > homemade nutrient water > cooled boiled water > tap waterOf course, this ranking is not absolute. Sometimes a water type ranked lower can outperform one ranked higher. What we are describing here is the ranking under general conditions. Below, let us analyze in detail the pros and cons of various types of water for hydroponic plants.

Mineral Water/Purified Water

Ranking mineral water or purified water at the top does not mean its nutrients are the best for hydroponic plants. Rather, Huayu Jun thinks it is the most suitable water for hydroponics.

First, it is relatively clean. With hydroponic plants, overall ornamental appeal matters a lot. Mineral water contains only trace elements and no other impurities, with extremely high transparency, making hydroponic setups look very beautiful overall.

Second, it is rich in trace elements while having low salt content. It provides abundant nutrients without doing much harm to the roots.

The downside is that the cost is relatively high, because the water in a hydroponic setup cannot be used indefinitely. It needs to be changed at least once a month. If the hydroponic container is small, that is fine, but if the container is large, the cost becomes somewhat high.

Magnetized Water

Some flower enthusiasts place a small piece of magnet in clean water, and over time the water becomes magnetized water. Magnetized water contains few minerals and is clean enough. Used for hydroponics, it can promote plant metabolism, promote cell growth, and enhance stress resistance, making hydroponic plant leaves healthy, glossy, and green. It can also slow down the growth rate of algae in the water and has a very good effect on the root system of hydroponic plants.

The downside is that magnets are not available everywhere, so magnetized water is not readily accessible. Beyond that, Huayu Jun sometimes even feels it might be just a little bit better than mineral water.

Rainwater

Everyone knows that rainwater is very suitable for watering flowers, because rainwater is neutral water, basically free of toxins and minerals, with high oxygen content and nitrogen nutrients carried from the air. For hydroponic plants, it can make their leaves green and roots thick, making it excellent water for hydroponics.

The downside is that it is not available at all times. It must be collected in advance on rainy days, which is somewhat dependent on favorable weather.

River/Lake Water

River water and lake water can also be called "water from the sky." Is there not also a poetic line saying "the waters of the Yellow River come from the sky"? So its advantages are similar to rainwater: few minerals, low hardness, and it can also carry some local trace nutrients. For hydroponic plants, it is also quite good.

The downside is that the water may contain relatively many impurities, easily breeding small organisms, green algae, and so on, which shortens the interval between water changes. Moreover, river water quality may be polluted by various other chemicals, so sometimes it cannot be used with confidence. It is best to store it for a few days before use.

Homemade Nutrient Water

This one is more complicated. Homemade nutrient water can be rice-washing water, beer water, tea water, milk water, vitamin water, etc. It is more suitable for use together with other water types for hydroponics. The water is rich in nutrients and can, in the short term, promote the growth of hydroponic plants and make them robust and beautiful.

The downside is that it cannot be used long-term. It should only be used once after an interval of time, and the concentration ratio is hard to control. A careless mistake may burn the roots, which is actually bad for the plants. There is another point: homemade nutrient water has all undergone fermentation, so over time the water will stink, greatly reducing the ornamental appeal of hydroponic plants.

Cooled Boiled Water

This is what we commonly call cooled plain boiled water. Some people worry that boiling the water will make nutrients disappear. Indeed, after water is heated, the nutrients in it are damaged to varying degrees, so it is best used together with nutrient solution. Also, after boiling, cooled boiled water has fewer impurities and less calcium, and bacteria can be effectively reduced, giving it high cleanliness. Using cooled boiled water for hydroponic plants can keep plant roots white, tender, and beautiful for a long time, and it is somewhat better than tap water.

The downside is that the water has low oxygen content, which can easily cause oxygen deficiency in plants. If conditions permit, you can oxygenate the water before use. If not, shake the water around in the pot a few more times before use to increase oxygen content. It is best to mix it with other water types.

Tap Water

Tap water has few minerals and is clean, making it the most convenient water for hydroponics. After settling treatment, tap water can still allow plants to grow well.

The downside is obvious: it contains chlorine, which is harmful to plants. Before use, it must be left standing for at least 2 days.

The above is an analysis of the pros and cons of some types of water for hydroponics. If you plan to grow plants hydroponically, you may want to refer to this and make comparisons. In addition, domestic wastewater such as laundry water and dishwashing water contains harmful substances such as chlorine and alkali, and groundwater such as well water contains many minerals. Neither is suitable as hydroponic water. No matter what water you use, it must be changed regularly, and at the same time remember to clean the roots and keep the roots and container clean.

How Often to Change the Water for Hydroponic Plants and How to Replenish and Change Water for Hydroponic Plants

Due to transpiration from the leaves and evaporation of water from the container, hydroponic plants need timely water replenishment. If the water is not changed for a long time, bacteria can easily breed in the container and cause the plant to die. So how often should the water for hydroponic plants be changed? How do you replenish and change water for hydroponic plants? Let us take a look below.

How Often to Change the Water for Hydroponic Plants

Generally, a water change interval of 5-7 days is appropriate. However, the water change depends on the season. For flowers that have just been set up for hydroponics, it is required to change the water once every 1-2 days. In summer, plants grow vigorously, temperatures are high, and water easily spoils, so the interval should be shortened. In winter, most plants are in a semi-dormant or dormant state, temperatures are lower, and the water change interval can be longer. Overall, a shorter water change interval is beneficial to plant growth.

How to Replenish and Change Water for Hydroponic Plants

Generally, purified water is used as the water for hydroponics. Purified water is desalinated water with low salt content, making it suitable water for hydroponic flowers. In addition to low salt content, purified water also has the advantages of good transparency and no pollution, making it the most ideal water for hydroponic flowers.

In addition, qualified drinking tap water can also be used for hydroponic flowers, but tap water disinfection commonly uses liquid chlorine. Excessive chlorine harms flower roots. To allow the chlorine gas to be released, it needs to be left standing for a period of time before use.

When changing the water, the root system should be cleaned. Clean water can be used to rinse off the mucus on the roots, and some rotten roots and old roots that have lost their absorption capacity should be cut off. After a container has been used for a period of time, sediment will adhere to its walls, and moss is also likely to grow. It should also be cleaned thoroughly when changing the water.

There is also a small detail: when adding water to the container, do not submerge all the roots in water, as the roots will rot. It is best to leave more than one-third exposed. In this way, the roots can both absorb dissolved oxygen from the water and absorb oxygen from the air.

Why Plants Need to Be Continuously Replenished with Water

For hydroponic flowers, the water level should preferably be controlled low rather than high. It is enough to submerge one-third to one-half of the root system in water, and the root crown part of the plant should by no means be submerged in water. During hydroponic cultivation, plants consume part of the water through leaf transpiration, and some water also evaporates from the container opening. Therefore, after a period of cultivation, the water in the container decreases, the water level drops, and water must be replenished in a timely manner. Replenishing water can increase the content of oxygen ions in the root environment, which is beneficial to root development.

Why Plants Need to Have Their Water Changed Regularly

Changing the water for hydroponic flowers regularly or irregularly is also one of the key points in plant management, in order to keep the hydroponic solution fresh. Spring water, well water, etc. can be used as cultivation water. Tap water should be left standing for one or two days before use. The water change time can be determined according to the specific cultivation situation. Generally, in spring and summer, the water can be changed once every 3-5 days; in autumn and winter, once every two weeks. If the water quality is pure and clean, and the plant and root system are growing well, the water change interval can also be extended further, and it is enough to simply replenish the evaporated water.

What Hydroponic Plants Are There and How to Grow Hydroponic Plants

Speaking of hydroponic plants, I think we are all familiar with them. Most of us understand that hydroponics, as the name suggests, is simply placing plants and flowers directly into water for cultivation and growing. Is that really so? Let us find out: the most scientific explanation is that hydroponic plants and flowers use modern bioengineering technology and employ physical, chemical, and bioengineering means to domesticate ordinary plants and flowers so that they can grow in water for a long time, forming a new generation of high-tech agricultural projects.

Plants that can generally be grown hydroponically include Monstera deliciosa, Milan, clivia, camellia, Chinese rose, jasmine, rhododendron, evergreen, violet, Phalaenopsis, fuchsia, five-needle pine, rubber fig, Brazilian iron, begonias, ferns, palm family plants, and various foliage plants such as clustered Alocasia, silver bract taro, anthurium, Guangdong spider plant, and silver-edged evergreen.

There are also more than a hundred kinds including Sedum species such as Lotus Palm and Hibiscus Palm, as well as other types such as clivia, lady's slipper orchid, crab claw orchid, lucky bamboo, pendant bromeliad, dusty miller, Brazilian wood, ivy, and coleus. Basically, any plant that can be grown in soil can be grown hydroponically; only a very small portion of plants that prefer dry environments are unsuitable for hydroponics.

Cultivation Methods for Hydroponic Flowers:

After saying so much above, does it make people a bit confused? Well then, the editor will not go around in circles either. Let us get straight to the point: how are these hydroponic plants cultivated?

Generally, directly transplanting them into a hydroponic pot can be regarded as a superior approach. The specific steps are as follows:

1. Remove from pot: Tap the sides of the flower pot gently with your hand. After the soil loosens, the entire plant can be removed from the pot.

2. Remove soil: First gently remove excess soil with your hands.

3. Rinse with water: Wash off the soil or substrate sticking to the roots with water.

4. Cut the planting basket: If the head of the plant is too large while the holes in the planting basket are too small, the holes in the planting basket need to be enlarged to make planting easier.

5. Add nutrient solution: Add the prepared nutrient solution to the container. Planting large seedlings: Insert the plant's root system through the planting basket, being careful not to damage the roots.

6. Fix in place: Use sponge, granite, or yuhua stone to secure it (other fixing materials are also acceptable).

7. Finished product: Check whether the finished product is properly secured.

Preparation of Nutrient Solution Commonly Used for Water Propagation of Seedlings:

Water propagation uses water as the medium. Water contains none of the nutrient elements needed for plant growth, so a certain nutrient solution must be prepared to provide the nutrients needed for plant rooting and for seedling growth before transplanting. The choice of nutrient solution formula is the key to successful water propagation, and different plants require different nutrient solution formulas. Therefore, when doing hydroponics, we must prepare the nutrient solution according to the needs of the plant.

It is hoped that the introduction in this article can be of some help to owners who are about to renovate, making their new home refined and cozy. Wishing everyone a happy and fulfilling life.