Is Growing Your Own Food Actually Cheaper?

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People ask me this regularly. Friends, readers, strangers at the plot gate who see me wrestling a courgette plant into a growbag and assume I must be saving a fortune. “Is it actually cheaper?” they ask. “Does it save money?”

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After fifteen years of growing my own, the last three on an East Sussex allotment, I’ve always given a vague, slightly evasive answer. “It depends,” mostly. “Probably roughly even, once you factor everything in.” This year I decided to stop being evasive and actually do the maths. Not to prove a point either way — but because the honest answer matters, and the honest answer is more interesting than the optimistic version.

So here it is. The full reckoning.

Table of Contents

The real annual costs of an allotment

Let’s start with what it actually costs to run a plot. Not the fantasy version, where you already own good tools and make all your own compost. The real version, with real purchases.

Plot rental: This varies enormously depending on your council and your location. UK allotment rents range from under £30/year in some areas to well over £200 in London and the South East. I pay approximately £80/year for my East Sussex plot — towards the lower end of the regional range, but not unusually cheap. Call it £50–150/year as a realistic national band.

Seeds: A typical growing season involves more seed packets than you think. If you’re growing tomatoes, courgettes, beans, salad leaves, beetroot, chard, carrots, herbs, and a few brassicas, you’ll easily accumulate 20–30 packets. Seed prices have risen sharply in recent years — expect to pay £2–4 per packet for most varieties, more for F1 hybrids. A realistic seed spend for an active grower: £60–90/year.

Compost: Unless you’re making all your own (more on that later), a productive plot needs bought-in compost — for raising seedlings, filling growbags, and improving beds. Five to ten 40-litre bags per year is a reasonable estimate at £6–8 per bag. That’s £40–70/year, and it can easily climb higher if you’re filling raised beds or doing a lot of container growing.

Tools — amortised: A decent basic toolkit (fork, spade, trowel, hoe, dibber, hand rake) costs £100–200 bought new from a reputable supplier. Quality tools last ten or fifteen years with basic care, so amortised across a decade that’s £10–20/year. Worth buying once and buying well — a good trowel outlasts three cheap ones. (Affiliate link: quality garden trowels on Amazon UK.)

Sundries: Netting, bamboo canes, fleece, string, pots, labels, slug deterrents, a new watering can every few years — this category is death by a thousand small purchases. Budget £20–40/year and be honest with yourself about whether you go over it.

Total annual cost estimate: roughly £210–340/year for a fairly equipped, actively growing plot. I’ll call my own honest figure around £250/year, which feels accurate to recent years.

What a productive plot actually yields — in £ terms

This is where the maths gets genuinely interesting, because the answer depends almost entirely on what you grow.

A well-tended full allotment plot (typically around 250 square metres) can theoretically yield an impressive volume of produce. Yield estimates vary wildly depending on the source and the grower, but a realistic productive season might include:

Tomatoes: 15–25kg from a decent run of plants. At £2.50–4.00/kg for equivalent quality in a shop: £40–100
Courgettes: prolifically, sometimes embarrassingly so. 20–30kg is achievable. At £1.50–2.00/kg: £30–60
French and runner beans: 8–15kg across the season. At £3.00–4.50/kg: £25–65
Salad leaves and cut-and-come-again crops: the value-to-effort ratio here is exceptional. Supermarket salad bags are expensive. Growing your own can represent a saving of £2–3 per week through the summer — £40–60 across the season.
Herbs: fresh basil, parsley, coriander, and thyme cost £1–2 a time in the supermarket. A few plants in a pot give you months of use — probably £30–50 in savings.
Beetroot, chard, spinach: decent value and easy to grow. £20–40 across the season.
Potatoes and onions: here’s where the maths turns against you. Maincrop potatoes are cheap to buy. Growing them takes significant space and attention. The saving versus shop price is modest — perhaps £15–25 worth from a 3-metre row — and the effort is substantial. Growing them for taste (which is genuinely better) makes sense. Growing them to save money is harder to justify.

Adding up a productive year across a well-grown range of crops, a realistic total might be £300–600 worth of equivalent shop produce. High-end estimates from enthusiastic sources suggest £1,000–2,000+, but these tend to assume high-value crops grown perfectly, minimal losses, no gluts, and shop prices for organic equivalents. Take them with a generous handful of compost.

My honest estimate for my own plot: somewhere between £400–550 worth of produce in a good year. A poor year (late blight on the tomatoes, a courgette failure, a slug catastrophe) might come in at £250–300.

The honest verdict — does it save money?

Here’s the actual maths:

Annual plot costs: approximately £250/year (my figures)
Value of produce harvested: approximately £400–550/year (good year)
Net saving: approximately £150–300/year

That’s not nothing. Over ten years, it’s £1,500–3,000 in real terms — a meaningful sum. But it’s also not the financial revolution that allotment evangelism sometimes implies. It won’t change your financial trajectory. It won’t offset a mortgage or fund a holiday.

The honest answer to “is growing your own cheaper?” is: slightly, if you run the plot well and grow the right things. Not dramatically. And with a lot of variance either way.

And there’s a hidden cost I haven’t mentioned yet: time. A productive allotment requires real hours — probably 5–8 hours per week through the main growing season, less in winter. If you value your time, that changes the equation entirely. This isn’t an argument against allotments — it’s an argument for being clear-eyed about why you’re doing it.

What tips the balance — the things that actually make it worthwhile financially

If you want to improve the financial case, a few things make a meaningful difference:

Grow high-value crops, not cheap ones. Tomatoes, salad leaves, courgettes, herbs, climbing beans, and peppers all have excellent value ratios versus shop prices. Maincrop potatoes, onions, and large brassicas are grown for taste and satisfaction, not savings.

Make your own compost. A well-managed compost system — two bays, regular turning, balancing greens and browns — can produce enough compost to significantly reduce or eliminate bought-in bags. That’s a saving of £40–70/year that compounds over time. It also improves your soil considerably.

Save seeds. Many vegetable varieties — particularly open-pollinated rather than F1 hybrids — can be saved year to year. Tomatoes, beans, courgettes, peas, and many herbs all save readily. Over time, seed saving can reduce your annual seed spend by 40–60%. You’ll need small envelopes and a cool, dry place to store them — simple kit, real savings. (Affiliate link: seed saving envelopes on Amazon UK.)

Don’t buy unnecessary gadgets. The allotment product market — gadget watering systems, specialised soil testers, elaborate propagation kits, heated germination mats — is real and tempting. Most of it is unnecessary. A windowsill, some recycled yoghurt pots, and a decent bag of seed compost will germinate everything you need.

Use growbags well for high-value crops. Tomatoes and peppers do exceptionally well in growbags if the watering is consistent. The cost of two or three growbags (£6–8 each) versus the yield of a good tomato season is one of the better value equations in allotment growing. (Growbags on Amazon UK.)

Find a cheap or subsidised plot. Some local councils still heavily subsidise allotment rents — particularly in areas with long waiting lists, ironically. If you’re on a waiting list, it’s worth asking your local authority directly about their pricing structure. The difference between a £40/year plot and a £140/year plot is £1,000 over a decade.

The case that has nothing to do with money

Here’s where I have to be honest in a different direction.

The reason I grow my own is not financial. The maths above shows a modest net saving in a good year — that’s a nice thing, but it’s not why I’m there on a cold October morning turning compost.

I’m there because I know exactly where my food came from. Because the flavour of a tomato pulled warm from the vine bears no resemblance to the flavour of the same variety bought in a bag from a supermarket. Because the physical work of growing things is genuinely good for my mental health in ways that are difficult to quantify but easy to notice. Because watching the seasons move through a plot of land keeps you connected to something that office life tends to abstract away.

There’s also the question of food security — modest, perhaps, but real. Knowing that you can grow a meaningful portion of your own vegetables is not nothing, particularly in a period when supply chains feel less certain than they once did.

None of this shows up in the maths. The maths is a useful frame — it keeps you honest about what you’re spending and what you’re getting — but it’s not the whole picture. Asking “is growing your own cheaper?” is a bit like asking “is reading books cheaper than watching television?” It’s asking the wrong question. The value is mostly elsewhere.

You probably won’t retire on your allotment savings

But you will eat better. You will understand food differently — its seasonality, its fragility, the work behind it. You will have somewhere to be on a Saturday morning that asks nothing of you except attention and effort. You will occasionally produce a courgette the size of a small dog and feel absurdly pleased about it.

The honest allotment maths says: a small net saving, a lot of variance, meaningful non-financial returns. Run it well, grow the right things, make your compost, save your seeds, resist the gadgets. The economics are better than people assume but not as good as the enthusiasts claim.

And then there are the tomatoes. Which you simply cannot put a price on.

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