Hydroponics vs an allotment
This is usually argued as indoor against outdoor, or as technology against tradition, and neither framing helps. The real difference is what each one is short of. Hydroponics is short of light and space, so it grows a small number of things extremely well and cannot grow most of what a plot grows at all. An allotment has light and space for nothing, and is short of your time and the weather’s cooperation. Almost every practical difference below comes from that, and so does the honest answer for most people — which is that these solve different problems and only one of them is actually about food.
The decision this settles: You want to grow food, you have realised you are not going to do it on a windowsill, and you are choosing between putting a system in the spare room or garage and putting your name down for a plot. One has a waiting list and the other has an electricity bill, and nobody has told you which of those is the real constraint.
Where they genuinely differ
Marked per row rather than overall — “better” only means something relative to a specific dimension.
| Point of difference | Hydroponics | Allotment gardening |
|---|---|---|
| What it is short ofThe axis everything follows from, and the one that decides what will actually grow. | Light and space. Every watt is bought and every square metre is indoors | Time and weather. The light is free and unlimited and you cannot control anything else |
| What you can realistically growMuch the most important axis and the one most often skipped. Potatoes, carrots and onions are cheap and bulky and make no sense under lights; salad in February makes a great deal of sense. | Leaves, herbs, and with enough light, tomatoes, chillies and strawberries. That is close to the whole list | Almost anything that grows in your climate — roots, brassicas, legumes, alliums, soft fruit, top fruit, potatoes by the sackAdvantage here |
| What it costs to runThe comparison people get wrong. Hydroponic salad is not cheaper than shop salad once the lighting bill is honest, and allotment potatoes very much are cheaper than shop potatoes. | Electricity, continuously, and it is the dominant cost. Lights and pumps run whether or not you are interested that week | Plot rent, typically £25–£100 a year, plus seed, compost and the fuel to get thereAdvantage here |
| How soon you can startThe decisive practical difference for a lot of people, and the reason plenty of readers are choosing hydroponics because it is available rather than because it is preferable. Put your name down anyway — the list costs nothing to join. | This weekend. Buy it, plug it in, and you are growingAdvantage here | When a plot comes up, which in many towns is one to five years |
| What happens if you go away for a fortnightUnderrated, and it is why hydroponics suits people whose lives are unpredictable. | Usually fine. Timers and a full reservoir cover it, and failures are electrical rather than biologicalAdvantage here | You come back to weeds, and in August possibly to nothing |
| What you have to learnTwo different kinds of knowledge. One transfers anywhere and the other is worth years but only where you are. | A system: pH, conductivity, a weekly routine, and the discipline to measure rather than guess | A place: your soil, your aspect, your frost dates, and what does badly in your particular corner |
| How much space it needsThe other reason hydroponics is chosen. A flat with no outdoor space rules out one of these entirely. | A corner of a room, a garage or a tent. Genuinely smallAdvantage here | A plot, typically 125 to 250 square metres, and a way of getting to it |
| Being outdoorsWorth stating plainly because it is rarely on the list and it is frequently the thing that decides it. Nobody joins an allotment waiting list only for the vegetables. | You are not. This is an indoor technical hobby that produces food | Half the point for most plot-holders, and the reason many keep going in years the crops failAdvantage here |
| The social sideAllotment sites are among the most reliably sociable places in this catalogue, and the help is practical rather than theoretical. | Online, and largely technical — system design, nutrient regimes, light spectra | A site full of people who will give you plants, tools, advice and more courgettes than you wantAdvantage here |
Hydroponics
Somebody in a flat, or with no outdoor space, who wants salad and herbs year-round and likes a system to tune
Hydroponics fits where nothing else does, starts immediately, tolerates an unpredictable life, and produces the one category of food that is genuinely expensive and genuinely better fresh. Treat the electricity as the price of a hobby rather than as a saving.
More on HydroponicsAllotment gardening
Somebody who wants to grow food properly, wants to be outside, and can wait
A plot grows the things that fill a kitchen rather than a salad bowl, costs almost nothing to run, and comes with a site full of people who will help. The waiting list is real and it is the only serious obstacle — which is an argument for joining it today rather than for choosing something else.
Both reward measuring rather than guessing, and both punish the fortnight of inattention in August. Both are far more about routine than about equipment, and in both the commonest beginner failure is scale: too many plants, too fast, before the routine exists.
Neither page publishes nutrient dosing figures. The hydroponics page declines them on the record and its calculator takes the numbers off the reader’s own bottle, because a feeding strength is the manufacturer’s figure and a general one would be an invented authority.
And a great many people do both. A plot for the bulk crops and a small indoor system for salad through the winter is a common and sensible arrangement, which is worth saying because the comparison implies a choice that plenty of growers decline to make.
Last reviewed 2026-08-19. HobbyHQ does not declare a winner in comparisons — why.