Guide To Growing Hydroponic Onions

Guide To Growing Hydroponic Onions

Hydroponic Onions, Growing vegetables on hydroponics is very useful. Hydroponics will not only give you the vegetables you love, but it will also help you save money and improve your overall health.

Growing onions on hydroponics is not only delicious and nutritious, but also the easiest to grow hydroponic vegetable. Hydroponics is a growing method that does not require the use of soil.

Guide To Growing Hydroponic Onions

Guide To Growing Hydroponic Onions

Instead, you will rely on nutrient water or moist air to grow your hydroponic plants. Some root crops, such as onions, can be grown on hydroponics using simple and uncomplicated techniques, such as greens. However, there are a few key factors that you should consider in order to get as many bulbous bulbs as possible.

The most important part is to maintain the hydroponic conditions of onion cultivation so that the growth rate remains as high as possible. In this article we will also look at the topics below about hydroponics onion cultivation;

  • a simple process of growing onions on hydroponics
  • Can you grow onions on hydroponics?
  • how long does it take to grow onions on hydroponics
  • how to grow onions on hydroponics
  • which hydroponics system is best suited for growing onions
  • what do you need to grow onions on hydroponics

step-by-step process of hydroponic onion cultivation

Hydroponic onion cultivation has become the most popular. Onions are known for being relatively easy to grow on hydroponics, it only requires a bottle of water and a window with enough sunlight.

Within a week, the onion will begin to give green shoots that can be harvested continuously and used in a variety of dishes and recipes.

the best varieties of onions for hydroponic systems

You need to choose the right onion variety for the hydroponic system. There are basically three groups that define onion varieties;

    • short day bow
    • medium onion
    • longbow

The short onion variety is the most suitable onion variety for growing using any hydroponic system. If you plan to grow onions using a hydroponic system, then you will probably also use lamps for growing and heating systems.

Such devices, as a rule, consume too much electricity, which can cost you a lot of money at the end of the month, especially if you are trying to grow a large amount of onions.

A short-day onion needs less daylight to move from the vegetative stage to the bulb stage.

Thus, instead of planting long onions and keeping the growing lamps on for 16 hours every day, you will only open them from 10 to 12 o’clock.

Another advantage of growing short-day varieties on hydroponics is their ability to tolerate cold. This onion variety was originally grown in southern regions with low temperatures.

Undersized onion varieties are a great money saver, they will still grow well despite the shorter lighting time.

The short-day varieties for hydroponics that you should choose are the following;

    • Texas Super Sweet
    • Yellow Garnex
    • white Garnex
    • Texas sweet white
    • sweet red
    • Georgia sweet
    • white bermuda

create your own onion hydroponics system

You can buy the system online or create it yourself. Creating a hydroponic system can be a bit complicated, but you want to save money and be relatively useful.

If you decide to do this, you will need the following equipment;

    • trays and stands for growing
    • air stone and air pump for oxidation of nutrient solution
    • resources for nutrient solution storage
    • water pump for feeding nutrient solution from the tank to the growing tray
    • hydroponic tubes
    • clean cup

how to grow hydroponic onions indoors

  1. first fill the jar with water almost to the brim, and then add vegetable fertilizer intended for onions, be sure to follow the instructions on the package.
  2. then put the onion on the lid of the jar so that the roots are directed down into the water. If the onion is smaller than the neck of the jar, insert a half-inch toothpick on each side of the onion, then put the onion in the jar.
  3. if necessary, add or drain water so that the water level covers only the onion roots.
  4. after that, put the jar on the windowsill, which gets sunlight most of the day. If you do not have access to a window with sunlight, then place the test tube under the growing lamp.

how long does it take to grow onions on hydroponics?

Depending on the type of onion you grow and whether you plan to harvest only the tops or bulbs, it takes from 3 to 90 days to harvest onions on hydroponics.

Green onions are the fastest-maturing variety of onions that you can grow in a hydroponic system; it takes only 21-30 days to reach maturity. In all types of onions, seeds germinate in about 6-10 days.

Hydroponics nutrient medium and nutrients for onion cultivation

Regardless of which system you choose, and regardless of whether you buy a ready-made unit or create it yourself, you also need nutrient media and nutrients for plant growth.

Onions are unpretentious in care, when it comes to their nutritional needs, they don’t need a lot of fertilizers.  Although you can speed up their growth by adding some nutrients. Nitrogen is necessary, but you shouldn’t add too much of it, as it will create lush foliage, not bulbs.

When you add fertilizer, do it later in the growth cycle than at the beginning, as this can hinder the growth of seedlings by burning them.

There are several variants of nutrient media for growing in hydroponics. You can use composite plugs, stone wool or perlite. It depends on which system you are going to use, and the Kratky system is the simplest.

Then pour the nutrient solution, as in a jar. No further action is required; you should just leave the onion as it continues to use the nutrient solution until it is fully grown.

When using the DWC hydroponic system, be sure to set the nutrient solution level in such a way that it is neither too high nor too low.

Avoid adding nutrient solutions to newly transplanted onion seedlings during the first period. This contributes to greater root growth, which will subsequently support the onion in further development.

Reservoirs need nutrients mainly for onions, it is better to starve them at the initial stage when seedlings grow.

This helps to create a strong root base for the plant and will promote its growth. The balance of nutrients for onions can be difficult.

Nitrogen is necessary for plant growth, but adding too much nitrogen will lead to the neglect of onion bulbs in favor of foliage. And too little nitrogen will reduce the endurance of plants and their growth.

In addition, ensuring proper nutrition is characterized by the fact that it is necessary to monitor the pH level and electrical conductivity. The nutrient solution should be changed once every 3 weeks.

necessary conditions for growing onions on hydroponics

As a rule, to start growing onions on hydroponics, you will need several materials, including the onion sets themselves, water, nutrient media, clean pots, water, air pumps and stones, as well as growing trays.

  • the pH level of nutrients is 6.0 – 6.7
  • EC level-1,4-1,8
  • PPM 980-1260

Onions are easy to grow in an open hydroponic system. In addition, they can be successfully grown in indoor conditions. Onions can be grown from seeds or kits. Onion sets are small immature bulbs that are planted instead of onion seeds.

lamps for growing onions on hydroponics

The short-day onion is the most suitable onion variety for any hydroponic system. Short-day varieties of onions require an average of 10 to 12 hours of light per day, which is the shortest among all other varieties of onions. Also, use LED bulbs for growing plants to increase energy efficiency.

pH level for hydroponic onion cultivation

For good onion growth, it is very important to maintain the pH level in the water tank. About 6.0-6.7 is the preferred level for optimal growth.

chlorinated water for hydroponic onion cultivation

If you use chlorinated tap water in hydroponic conditions, it should be allowed to infuse for 48-72 hours to remove chlorine.

prepare your system and clean the pan

Start by filling a clean pot with a nutrient medium such as perlite. Mesh pots have holes in the bottom and are designed for use in hydroponics so that nutrients can easily reach the roots of plants.

This pan facilitates the draining of the solution. We recommend using 3-inch mesh pots for this kind of vegetables. Place each bulb in half in the substrate, then place the pot in the growing tray. Let it fill up with water before adding your airstone and it will add oxygen to the system.

start growing onion bulbs or seeds for onion cultivation hydroponics

When you plant bulbs, try to do it at about the same height. Meanwhile, your roots will be quite moist.

Also, you can grow onions from seeds rather than from bulbs or kits, although it does take a little longer. It takes 10 days for onion seeds to germinate.

Then plant onion seeds on a sunny windowsill or under a light for cultivation. Plant the seeds about an inch deep and an inch apart.

After that, after about 30 days, you can transplant it into a clean pot. A hydroponic onion grows best in full sun, so if you use a hydroponic system indoors, you need to give it about 12 hours of light a day with grow lights.

temperature requirements for onion cultivation hydroponics

The ideal temperature level for hydroponic onions is from 12 °C to 23 °C. Remember when we decided to plant short varieties of onions instead of medium or long ones.

The variety is very resistant to low temperatures. Thus, it will allow you to save a lot of money on heating and electricity bills every month.

Once the onion is planted, you don’t need to do much to care for it. Check your nutrient solution regularly, making sure that the pH level remains at 6.0-6.7.

The water you use in your system should not be chlorinated, but if you use chlorinated water, leave it alone for 72 hours so that the chemicals disappear.

When you add nutrients to the tank, wait an hour and then check the pH to see if it needs to be adjusted. Finally, make sure that the hydroponic onion has access to good air circulation. Otherwise, they can rot and moldy.

air circulation and aeration in hydroponic onion cultivation

Aeration is very important for hydroponic plants. Since they grow at high humidity levels, if the air around them does not circulate properly, it can lead to the growth of mold or bacteria.

And it can be detrimental to your plants. For good air circulation, you can install a fan, either floor or ceiling, or even leave the window open.

You must constantly aerate the solution not only to preserve the nutrients of hydroponics and prevent anaerobic bacteria, but also to saturate the roots with oxygen.

the best hydroponics for growing onions

If you grow onions on hydroponics, start by choosing your hydroponic system. The hydroponic installation is installed in a greenhouse system or as part of it.

Creating conditions for growing will be relatively similar, but you will need lighting for the indoor environment, whereas for a greenhouse it may not be necessary.

Choosing a hydroponic system for growing onions can be a daunting task. Hydroponic systems can be used for growing root crops, such as the technology of creating a nutrient film for onions, flooding and drainage technology (tidal), deep-sea culture and the short method.

DWC uses an air pump to distribute oxygen in your nutrient solution. The DWC system will allow you to use separate growing trays or containers to reduce the risk of roots sticking to each other or disease.

Hydroponics with tides is another great option. It is best suited for plants that require long periods of drought, and also works well with root crops such as onions.

technology of creating a nutrient film for hydroponic onion cultivation

NFTs provide the ability to grow large volumes of plants and use less space compared to other hydroponics systems.

However, there are a few important changes that you will want to make before planting your first onion. The distance is very important for the bow.

Then you should ensure the proper spacing between each bulb to reduce light competition when the leek gets high in the harvest stage.

The correct distance is about 4 feet between each 2 adjacent bulbs. Then you can set it up yourself or just buy a regular NFT hydroponics system and leave an empty bag between each 2 bulbs.

Hydroponic onion pots should be wider than regular pots. If the hydroponic pot is not wide enough, the onion will grow from the inside or break the hydroponic pot and get stuck in the nft pipe. You should make sure of the size of the pot even before you start planting onion seedlings.

deep-sea culture for onions

DWC hydroponic systems can also be an excellent choice for growing hydroponic onions. It cannot be used to grow onions in very large quantities and remains an ideal choice for beginners.

Hydroponic systems for deep-sea crops are easy to manage without any special difficulties. You need the diameter of the hydroponics pot to be large enough for the onion to grow large and not get stuck in it.

method short for growing onions

The short method was used to place a half-grown onion in a jar of water and then leave it next to a glass display case.

Later, the water in the jar is used by the onion as it gets bigger and the leaves get taller. This method can be used to grow onions as a decoration in the kitchen. In addition, it can be used as a cool project for studying hydroponics.

If you don’t have a DWC system for growing onions on hydroponics, you can use the short method.

The advantage of this brevity method is that it is ideal for plants with a short life cycle, such as green onions. The water level will fall as the roots of the plant grow, providing the roots with a growing air zone.

Growing onions short is a simple method of growing onions and other hydroponic vegetables. It is ideal for fast-ripening crops such as onions, especially if you want to harvest a large crop in a short time.

the process of creating a hydroponic onion growing system

Before you start growing onions on hydroponics, you must first decide which onion seeds you want to start with. Many people grow green onions in this form because they grow quickly, even though they are much smaller than ordinary onions.

The instructions below will tell you how to start growing hydroponic onions;

  • First, you need to decide on the place where you will place your installation. As for onions, you can grow them indoors or outdoors, so depending on what is possible for you, you can place your kits anywhere.
  • onions can be planted directly at the stage of sowing seeds, or you can plant bulbs first. Using small onion bulbs and then placing them in a nutrient medium containing an external hydroponic plant may be an easy way for you.
  • the environment for growing your onions is a very important aspect. When planting small bulbs for the first time, nutrient media such as composite plugs, rock wool or even ordinary old soil will be suitable. As soon as they grow up a little, they can be placed in a hydroponic system. Place onion seeds or bulbs in appropriate nutrient media.
  • You can use one of three methods to irrigate them. These are small onion seeds, so you can soak them in water for a while, or you can soak the seeds, or you can just put the onion seeds in a nutrient medium and gently sprinkle them with water.
  • Now we turn to caring for them, the new onion seeds do not need nutrients. Nutrition can be harmful to them. This is because the germ in the seed already has the nutrients and then the energy the seed needs to grow, and this is what the seed uses. Thus, adding more artificial nutrients will harm the plant.
  • seedlings do not need fertilizers and can damage seedlings by subjecting them to chemical combustion or delaying their growth.
  • place these little cultivated onion seeds in a dark, warm place so they germinate well. When they begin to turn into small plants, transplant them together with the nutrient medium into a hydroponic installation. When installing a water tank, which you can easily make yourself from simple objects, make sure that its depth is at least 6-8 inches. After that, prepare the seeds for the hydroponic system, and the hydroponic plant is ready; now it’s time to start using it for its intended purpose.

when and how to harvest hydroponic onions

While green onion shoots can be harvested in just 3 weeks from the moment of planting, it will take you 80 to 90 days to harvest onions.

Harvesting onions on hydroponics is no different from harvesting onions grown in the usual way. This is the same rooting procedure that you should follow.

The best time to harvest hydroponic onions is early morning. Then just draw them and they are ready to use. If you see flower stalks emerging from the onion, this is a good sign that the onion has stopped growing and is ready for harvesting.

Another good indicator that the hydroponic onion is ripe is that the foliage has turned yellow and turned upside down. After harvesting your hydroponic onion, let it dry to cure.

To do this, place it on a flat surface with good air circulation and a cool temperature level. Store in old onion bags, protected from direct sunlight, and they should last for several months.

FAQ Hydroponic Onions

Is it possible to grow onions on hydroponics? You may be wondering if it’s possible to grow onions on hydroponics-and we’re here to tell you that it’s not only doable, but also relatively simple. In fact, onions are one of the easiest plants to grow in a hydroponic system.

What can’t be grown hydroponically? Carrots, radishes and beets are examples of root crops that do not grow well with hydroponic cultivation. This vegetable needs loose soil so that its roots can spread and grow well. In a hydroponic system, the roots will be limited to a small space, and there will not be enough room for them to grow.

Can you grow onions only in water? Onions don’t even need soil to grow. Growing onions in water is a project that children will like because they can see the growing roots through glass. What’s it? If you put an onion that grows with roots under a glass of water, it will continue to grow on top with new shoots.

How long does it take to grow onions on hydroponics? from 3 to 90 days, how long does it take to grow onions on hydroponics? Depending on the type of onion you grow and whether you plan to harvest only the tops or bulbs, it takes from 3 to 90 days to harvest onions on hydroponics.

How long can onions grow in water? As soon as the toothpicks are ready, spread the onion in the jars with the roots down so that it is immersed in water. Put the jar on the windowsill, which gets a lot of sunlight, and let the onion grow for 2-3 weeks.

Is it better to plant onions in water or soil? As soon as the onion begins to bloom, it should be planted in the ground, since it can no longer grow in water. If you want to plant onions faster, and not wait for the appearance of flower stalks, you can plant it if you see that white roots grow from the onion.

How many onions can you grow in a 5-gallon bucket? A 5-gallon bucket is well suited for planting 6 or 8 bulbs. Large boxes for planters or even plastic tubs are well suited. Make sure that your container has good drainage holes, and try to lift it slightly off the ground.

Does onion grow faster in water or soil? it will grow faster, because according to the results of the experiment it was shown that leeks grow more in water than in the ground.

Why are hydroponic plants harmful to health? If you want to ensure a safe and healthy growth cycle, you should pay attention to the temperature of the nutrient solution. Hydroponic plants have different temperature requirements than plants grown in soil, and if you fail to maintain an optimal climate, you may encounter wilted plants or rotten fruit.

What are the 3 disadvantages of hydroponics? 5 disadvantages installing hydroponics is expensive. Compared to a traditional garden, hydroponic systems are more expensive to purchase and build. Vulnerable to power outages. Requires constant monitoring and maintenance. Water-borne diseases. Problems affect plants faster.

What is the number one plant grown on hydroponics? Although almost all plants can be grown on hydroponics, the most common are lettuce, tomatoes, peppers, cucumbers, strawberries, watercress, celery and some herbs.

How many bulbs will one bulb grow? one bulb will make one bulb from one bulb; sets can be planted 2 inches apart if they are harvested as leeks or “green onions”, or 4-6 inches apart if left to mature into full-sized ripe onions. You don’t need to plant in rows; 24 leeks can grow on a 1×1 square!

Is water onion edible? The stems of dwarf bulbous plants are more like the stems of “leeks”, such as green tubes or straws, while water onions are more like the leaves of “crab grass”. And just because this plant may look like a real onion, it’s not. This is a plant to eat.

Can green onions survive only in water? Luckily for you, green onions (or leeks) are also one of the easiest vegetables to grow at home. Start with the white tip of the vegetables, which you usually cut off before slicing. Place each root tip in a glass or jar with enough water to completely cover the tuber.