Quick answer: Hydroponics means growing plants with their roots fed by a nutrient solution instead of garden soil. For a first grow in the UK, keep it simple: a grow tent, an LED light, an extractor fan with a carbon filter, an inert medium such as coco or clay pebbles, a two-part hydro or coco nutrient, and a pH and EC meter. Start with easy crops like lettuce, basil or chillies, change your solution regularly, and check pH every time you feed.
What is hydroponics?
In soil, plants have to search for food. In hydroponics, you give it to them directly in the water, mixed to the right strength. Because you control exactly what reaches the roots, plants tend to grow evenly and you can spot and fix problems quickly.
The trade-off is that there is less margin for error. Soil buffers mistakes. A hydro system will show you within days if the pH has drifted or the feed is too strong. That is why the two habits that matter most for beginners are measuring and keeping things clean.
The main types of hydroponic system
You will see a lot of names online. For a home grower, these are the ones worth knowing.
Deep water culture (DWC)
Plants sit in net pots above a tank of nutrient solution, with their roots hanging into it. An air pump and air stone keep the water full of oxygen. It is cheap, quiet and great for lettuce, herbs and leafy greens. You will need an air pump and an air stone as a minimum.
Ebb and flow (flood and drain)
A tray of pots filled with clay pebbles is flooded from a reservoir by a pump on a timer, then drains back. It suits a wide range of crops and is forgiving if the power goes off for a short time.
Drip and coco
Strictly speaking coco coir is a growing medium rather than a "system", but many UK growers start here. You hand-water or drip-feed a hydro-style nutrient into pots of coco. It behaves a lot like hydro (fast growth, you control the feed) but holds more water, so it is more forgiving than a bare-root system. If you are nervous about your first grow, coco in pots is a very sensible way in.
What you need to get started
1. A grow tent
A tent gives you a sealed, reflective space where you control the light, air and temperature. A 1.2m x 1.2m tent is the most popular starting size because it fits in a spare room and there is a wide choice of lights made for it. See our grow tents.
2. A grow light
Modern LED lights run cooler and cheaper than the old HPS lamps. For a 1.2m tent most growers choose a 720W bar-style LED. If you want everything matched in one go, our GorillaBox 1.2m grow tent kit with Omega Black 720W LED includes the tent, light, fan, filter, ducting, pots, soil, hygrometer and timer.
3. Extraction and air movement
An inline extractor fan pulls warm, humid air out of the tent and a carbon filter cleans it on the way. A small clip fan inside keeps air moving over the leaves. Fresh air matters as much as light.
4. A growing medium
Hydro media are inert, meaning they hold the plant up but do not feed it. Common choices are coco coir, rockwool and expanded clay. Canna Aqua Clay Pebbles are pH-stable and reusable; rinse them well before first use so dust does not block pumps or drippers.
5. Nutrients
Use a nutrient made for your medium. Hydro and coco feeds usually come in two parts, A and B, which you add to the water separately. A good example is Canna Coco A+B for coco. Always add Part A, stir, then add Part B. Never mix the two concentrates together directly.
6. Meters
This is where many beginners try to save money and regret it. You need to know two numbers: pH (how acidic the water is) and EC (how strong the feed is). A Bluelab pH Pen and a Bluelab Truncheon nutrient meter take the guesswork out, and a bottle of pH Down lets you correct it.
How to grow with hydroponics: the basic routine
- Start with healthy young plants. Root seeds or cuttings in plugs or cubes first, then move them into the system once roots show through.
- Mix your feed. Fill the reservoir or watering can, add Part A and stir, add Part B and stir, then add any extras.
- Check EC. Start at the low end of the label for young plants. Seedlings and fresh cuttings need a weak feed.
- Adjust pH last. Most hydro and coco growers aim for somewhere around 5.5 to 6.5, and many settle around 5.8 to 6.2. Check what your nutrient maker recommends.
- Watch the temperature of the water. Bluelab recommend a solution temperature of 18 to 22°C. Cold water slows roots down; warm water holds less oxygen.
- Change the solution regularly. In a recirculating system, plants take up nutrients unevenly, so the balance drifts. Topping up for ever leads to problems. Drain, clean and refill on a regular schedule.
- Keep everything clean. Light-proof reservoirs, clean tools and a clean floor go a long way to keeping roots healthy.
Good crops for a first hydro grow
- Lettuce and salad leaves: fast, compact and ideal for DWC.
- Basil, mint and other soft herbs: they love the steady supply of water and feed.
- Chillies and peppers: a bit slower, but very rewarding in coco or clay pebbles.
- Tomatoes: choose compact or bush varieties for a tent and give them support.
- Strawberries: do well in drip or ebb and flow systems.
Common beginner mistakes
- Overfeeding. More is not better. Start low and increase slowly as plants grow.
- Not checking pH. If pH is out, plants cannot take up certain nutrients even when they are in the water.
- Too much light too close. Hang the light at the height the maker recommends and dim it for young plants.
- Poor airflow. Still, humid air invites mould and pests.
- Letting light into the reservoir. Light plus nutrient water equals algae.
FAQs
Is hydroponics hard for beginners?
Not if you start small and measure. The equipment does the hard work; your job is to check pH and EC, keep the solution fresh and keep things clean. Coco in pots or a simple DWC tub of herbs is an easy first step.
Is hydroponics expensive to run in the UK?
The biggest running cost is electricity for the light. LEDs use much less power for the same output than older HPS lamps, which is one reason most new setups now use them. A light timer stops the light running longer than you need.
Do I need a grow tent?
For herbs on a windowsill, no. For anything bigger, a tent makes life much easier because it keeps light in, lets you control airflow and temperature, and protects the rest of the room from humidity.
What pH should my hydroponic solution be?
Most growers aim for roughly 5.5 to 6.5, with many keeping it around 5.8 to 6.2. Your nutrient label will give the range it is designed for, so go with that.
Get set up with expert help
We have been helping growers across the West Midlands for over 10 years. Pop into our shop at Unit 2 BlackLake, West Bromwich, B70 0PJ, call us on 0121 553 7872, or message us on WhatsApp and we will help you put together a setup that suits your space and budget. Free UK delivery on orders over £99, and we price match.