Growing Hydroponic Radish, Process, Requirements

Growing Hydroponic Radish.
Growing Hydroponic Radish.

Introduction to growing hydroponic Radish: Radishes are a rapidly maturing cool weather crop and they are easy to grow in hydroponically. Radish vegetable is an edible root vegetable of the Brassicaceae family. It is known to control damage to our red blood cells, and in the process also increases oxygen supply to the blood. It has high vitamin C; it can protect you from common cold and cough, and improve the basic immunity system. Radishes are a hardy and easy-to-grow root vegetable that can be planted multiple times in a growing season.

A step by step guide to growing hydroponic Radish

Radishes require little in the way of fertilizer added to the soil. A common problem with growing radishes is having too much of certain elements, generally nitrogen. The results can include spindly radish roots, overly thick greens on top, inferior flavor, and low levels of antioxidants in the mature radishes.

Growing radish hydroponically using various nutrient solutions circulating through water and sometimes a lightweight growing medium instead of soil has become immensely popular.  They are easy and fast to grow.  Radishes come in a wide range of varieties such as cylindrical salad radish, large Oriental radish, and rat-tail radish. In this article we also covered the below points;

  • Hydroponic Radish growing conditions
  • Optimal pH for Radish growing hydroponically
  • Hydroponic Radish nutrient requirements
  • How long does it take to grow Radish hydroponics
  • Advantages of growing plants by using hydroponics

Maintenance of hydroponic Radishes


Radishes must be started on a basic grow nutrient to encourage the growth of the green tops. Once the tops are developed by the beginning of the second week, switch to a root nutrient. And if you stay with the grow nutrient you will end up with lush greens and scrawny under developed radish roots.

Growth medium

To stabilize your radish plants, a growing media to support and stabilize the seedlings is required. Sand or sphagnum moss will suffice. A blend of perlite, vermiculite will work better. A little peat blended in is not a bad idea but not necessary. And if using net pots seal it with a coffee filter or tissue paper first. Be sure to leave some headspace, at least an inch, more if possible, between the filler from the reservoir and the top of the container.

Light requirement

You should make sure plants get around twelve hours of light. And this is not exact; a few hours more or less will probably work fine because plants get their energy from light, they must have exposure to the sun. However, they probably not get light 24 hours a day because such unnatural conditions may disrupt the normal growth of the plant. You may substitute a grow light for natural sunlight; be sure to put it on a timer to simulate day and night for plants.

Radishes require a bare minimum of 6 hours of light daily, 8 to 10 is best under most conditions. In nature, they tolerate partial shade. In a hydroponic setup, less light than other crops will suffice. Too much light generates too much heat and plants do not develop radishes in higher than normal temperatures.

Temperature and humidity

Ideally, the temperature must be somewhere between 55°F and 85°F. The optimum temperature could be different for different kinds of plants. A temperature-controlled environment would provide stable conditions, but if your plants are in a less stable environment, a heater would help to keep the temperature under control. If the environment gets too hot, you might want to shade your plants and put ice cubes in their nutrient solution to keep them from dying in the heat.

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Temparature Requirement for Hydroponic Radishes.
Temperature Requirement for Hydroponic Radishes.

They thrive in cool temperatures, best daytime temperature ranges between 72°F and 76°F. Nighttime temperatures should be around 60°F. They can tolerate and adapt to temperature fluctuations and not fragile in this respect.

Requirements for growing hydroponic Radish

The advantages of hydroponics controlled environment agriculture (CEA) contain high-density maximum crop yield, efficient use of water and fertilizers, and suitability for mechanization, disease, and pest control.  The advantages of hydroponics systems have high-density maximum plant yield. The hydroponics is an efficient use of water and fertilizers, minimal use of the land area. Hydroponics gardening can be packed and kept it alive and fresh for longer periods. The hydroponics system doesn’t even use any kind of solid medium. In hydroponics, no need to worry about over-watering or under-watering. Hydroponic plant culture systems and terminology used to describe them vary widely.

Water – Hydroponic radish pH level between 6.0 and 7.0.

Light – Direct sunlight exposure or supplemental lighting is required on average of 8 to 10 hours per day.

Nutrients – The nutrients required for plant growth are Nitrogen, Phosphorus and Potassium.

Temperature – Consistent temperatures for radish are 55 – 85°F.

Oxygen – Supplemental oxygen supply is required for optimal nutrient uptake.

Structure and support – Stakes and strings are needed to support plants as they grow.

Hydroponics systems are different structures (e.g., towers, trays, A-frames) that hold water or other inert media and provide places to grow plants. Hydroponics systems fall into two basic categories they are a solution (liquid) culture and an aggregate culture. In a solution system, the roots grow directly into a nutrient-filled solution. In an aggregate culture, such as gravel, sand, or small clay pellets, the roots grow into the medium. In each process, the system supplies the three essential ingredients plant roots need to grow are water, nutrients, and oxygen.

Different types of systems are obtainable to meet individual comfort levels in growing plants hydroponically. These contain drip, ebb and flow, nutrient film technique, water culture, aeroponics, and wick.

Hydroponics is a growing plant in a water-based nutrient-rich solution. Growing with hydroponics comes with several benefits, the biggest of which is a greatly increased rate of growth in plants. Plants will grow bigger because they will not have to work as hard to obtain nutrients.

The preparation of seedlings for hydroponics includes germination and transplantation. Germination is generally performed by adding one seed to a piece of a moistened solid medium called a “plug”, which is often made of rock wool, or a netted cup filled with peat and perlite.

Radishes will grow different types of hydroponic methods; one of the easiest methods is an ebb and flow system that uses enough growing media to support the plants from start to finish. In most hydroponic systems, water-soluble fertilizers are dissolved in the reservoir to feed to the radish plants. Check the pH level and electrical conductivity of the nutrient solution at least 2 to 3 times a week in case it needs tweaking. The ideal pH level for growing radishes hydroponically is between 6.0 and 7.0. Radishes benefit from phosphorus to improve color and also flavor.

Germinate the Radish seeds in a hydroponics system

Before you germinate the seeds, you must select what kind of plant you want to grow. If you are growing from seeds, you want to choose what kind; we recommend lettuce, beets, tomatoes, celery, and radishes. Other types of plants would probably work well too.  Ideally, you must use seeds with the shortest growing time possible. You should allow lots of extra time in case the plants grow slowly or something else goes wrong.

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The spacing of seeds in growing hydroponic Radish

Radish seeds require proper spacing to produce healthy radishes which are the primary edible part of the plant. Spacing affects the plant growth and mature size of the radish root. The radish greens, the leafy tops, don’t need much space, but the roots do. Try to leave ½ inches minimum but optimally ¾ inches spacing between plants.

Conditions for growing hydroponic Radish

All hydroponics requires a lot of light, either natural or artificial, for plant health. There is even a new branch of hydroponics based on aerosol watering of the plant roots rather than direct watering.

As for growing mediums, which are porous and often lightweight, and they come in an astonishing range;

  • Perlite and pumice, both volcanic byproducts
  • Vermiculite, a puffed superheated mineral
  • Growstones, a glass waste produce
  • Clay pellets
  • Rice husks and the coconut peat is known as coir
  • Gravel, sand, and brick shards
  • Wood fiber
  • Rock wool, a spun mineral fiber
  • Sheep wool

When hydroponic radish growing, in particular, the variety doesn’t matter. The fast-growing spring table radishes do well, as does the long-season daikon radish, or Asian radishes. Be careful not to transfer mature radishes from very wet conditions to dry conditions. The result is that the radish can split apart from the sudden change in water pressure. Instead, make sure to store the harvested roots in a refrigerator, wrapped in moist paper towels, and put in a plastic bag. As in conventional gardening, hydroponic radishes can be planted among greens to keep insects and pests at bay. Growing radishes hydroponically is economical and the seed germinates at a rate of about 80 percent.

Nutrient pH for Hydroponic Radishes must be 6.0 to 7.0.

The temperature should be kept between 50 and 85°F. Longer radish plant varieties tolerate heat better than the short round types.

About 8 – 10 hours of light daily optimal – but a bare minimum of 6 hrs.

Radishes are best started from seed and transplants are generally not recommended.

Process of growing hydroponic Radish

First, fill the plant tray with perlite and place the tray on a table where it will get 6 to 8 hours per day of sunlight. Place the plastic bin on the ground or a lower shelf under the plant tray.

And attach one end of the tubing to the tray’s drain. Drop the other end into about a 10-gallon plastic bin. Attach one end of the second section of tubing to the output of the submersible pump. Put the pump into the bin, and run the tubing from the pump up to the tray. Using a hose clip, attach the tubing in place over the edge then that the nutrients will flow into the tray when the pump is turned on.

Spread seeds over the top of the perlite, and then carefully cover them with a very thin layer of more perlite. Water them gently with a watering can several times per day until the radish seeds germinate and become established so that the nutrient bath doesn’t wash them away. Once seeds have sprouted, you can switch over from the watering can to the pump.

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Pour enough nutrient solution in the bin to fill the tray. The liquid must reach to within an inch of the top of the tray. Turn on the pump and time how long it takes to fill the tray. Set the timer to run for that amount of time 3 times a day, or 4 times if your air is very dry or hot.

Troubleshooting hydroponic Radish problems

Radish tends to bolt to seed if not kept moist enough this occurs they are useless, other than for seed saving.

If they are kept constantly and persistently soaked, rot becomes an issue and which is a serious issue in hydroponic setups. When the radish roots approach maturity funneling your water below the medium, deeper than the radish itself. The radish plant should still be able to draw adequate moisture and nutrients by transpiration pull for short periods. Alternating from funneling to your normal modus operandi should be considered if rot is an issue, or you fear it may become one.

Longer radish varieties occasionally develop a black root that produces dark blemishes and occasionally rots at the base of the plant roots. If this is a persistent problem it is advisable to grow round radishes.

Gardening tips for growing hydroponic Radish

Thin the plants as they begin to grow, just as you would for plants grown in the soil, leaving the strongest in place to grow.

Gardening Tips for Hydro Radish.
Gardening Tips for Hydro Radish.

Your plants will use up the nutrients at varying rates, this depending on the size and developmental stage of the plants. Keep the nutrients in balance for plants, never add anything but water to replace used or evaporated solution, completely replace the old solution with a new solution once a week. Otherwise, the nutrients will be out of balance and plants may die.

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