Hydroponics is a method of growing plants without soil, using a wet growing medium and a nutrient solution that's delivered directly to the roots. Because plants don't need to grow a large root system to search for food and water, they put more energy into vegetation above the surface & producing larger fruit, flowers and vegetables in the process. This guide covers how hydroponics works, why growers get faster results than in soil, and the two most common types of hydroponic system you'll come across as a beginner.
š± What is hydroponics and how does it work?
In soil, nutrients must be broken down into a usable form before a plant's roots can access them, and the soil itself anchors the root system. Hydroponics replaces both jobs with a wet growing medium and a specially prepared nutrient solution that's readily available to the plant.
Because food and water go directly to the roots instead of the plant having to search for them, hydroponic plants typically grow two to ten times faster and with larger yields than the same plants grown in soil. This comes down to higher oxygen levels at the root zone, pH kept within the optimum range for nutrient uptake, and a balanced, high-grade nutrient solution feeding the plant at every stage.
š§ Why growers choose hydroponics over soil
Hydroponic root systems stay compact, so plants can be grown closer together than in soil. Combine that with no weeding, fewer pests and lower water use, and it's easy to see why home hobbyists, schools, research institutes and commercial growers around the world have adopted hydroponics.
A hydroponic garden can be set up anywhere there's sufficient light and ventilation. Outdoors, it removes much of the labour that comes with conventional gardening & indoors, adding proper grow lights means you're no longer limited to growing seasons.
āļø How to maintain a hydroponic system
Once it's set up, day-to-day maintenance on a hydroponic system is straightforward.
| Task | Frequency | Status | Notes |
|---|---|---|---|
| Add water to the reservoir | As needed | Routine | Top up before levels get too low. |
| Add nutrients at the correct ratio | Each top-up | Routine | Follow the ratio for your crop and growth stage. |
| Run watering cycles via timer and pump | Several times daily | Automated | Cycle frequency depends on system type and crop. |
| Check and adjust pH | Regularly | Routine | Keep pH between 5.6 and 6.5. |
| Change the nutrient solution | Every 1-3 weeks | Routine | Frequency depends on water consumption. |
š” A-Grade Tip: Every hydroponic system we stock, from shelf-sized units to full greenhouse setups, is available as a complete ready-to-grow kit or a bare-bones kit, so you can start small and scale up as you get more confident.
š Ebb and flow (flood and drain) systems
An ebb and flow system works by temporarily flooding the grow tray with nutrient solution, then draining it back into the reservoir. A submerged pump connected to a timer handles both steps & when the timer switches the pump on, solution floods the tray, and when it switches off, solution drains back to the reservoir. The timer runs several cycles a day, with frequency set according to plant size and type, temperature, humidity and growing medium.
Ebb and flow suits a range of growing media. Some growers fill the entire tray with clay pebbles, gravel or granular rockwool, while others use individual pots filled with growing medium, which makes it easier to move plants around and helps the medium retain moisture for more efficient growth.
š Drip systems
Drip systems are probably the most widely used hydroponic system worldwide. A timer controls a submerged pump, which drips nutrient solution onto the base of each plant through a small drip line.
A recovery (recirculating) drip system collects excess solution back into the reservoir for reuse, which makes nutrient use more efficient and allows for a less precise, cheaper timer. It can, however, see larger swings in pH and nutrient strength that need periodic checking and adjusting. A non-recovery system doesn't collect run-off, so it needs a more precise timer to keep watering cycles accurate and run-off to a minimum & the trade-off is that nutrient strength and pH in the reservoir stay stable, so once it's mixed and adjusted, you can largely leave it until the next batch.
š” A-Grade Tip: If you're weighing up recovery versus non-recovery, remember the recovery system asks more of your pH and EC monitoring, while the non-recovery system asks more of your timer accuracy & pick the one that matches which of the two you'd rather manage closely.
Hydroponics comes down to giving plants direct access to water, nutrients and oxygen instead of making them search for it through soil, which is why growth rates and yields consistently outpace conventional gardening. Whether you start with a simple drip system or a full ebb and flow setup, the fundamentals stay the same: balanced nutrients, correct pH, and a consistent watering cycle. Browse A-Grade Hydroponics' range of systems, from shelf-sized starter kits through to full greenhouse setups, to find the right fit for your space.
