The Harvest Ledger: Does gardening pay?
Most hobbies cost money.
Cycling costs money. Golf costs money. Woodworking costs money. Nobody builds a spreadsheet to justify their weekend hobby because the value of it is personal, not financial.
Gardening is different. Gardening produces food. Food has a price. Which means the question — does growing your own food actually save you money? — is answerable. We answered it.
The Harvest Ledger is our working comparison between what TSG Hydro Systems produce and what the equivalent food costs at a supermarket. We update it annually. The numbers below show the 36-hole unit — our full-family size. We run a separate ledger for the 24-hole further down.
The Monthly Numbers
The 36-hole system is designed around high-value produce: gourmet lettuce varieties, culinary herbs, superfood greens, and Asian greens. These aren’t chosen arbitrarily — they’re chosen because they’re expensive to buy fresh, quick to harvest, and in constant demand in a real kitchen.
| Crop | Holes | Monthly Supermarket Cost (organic equiv.) | TSG Harvest Note |
|---|---|---|---|
| Gourmet Lettuce | 12 | ~$60 | Harvested leaf-by-leaf. No waste, no plastic bags. |
| Culinary Herbs (basil, coriander, parsley) | 8 | ~$44 | Living quality. Supermarket bunches are dead on arrival. |
| Superfood Greens (spinach, kale, silverbeet) | 8 | ~$40 | Clean, pesticide-free, cut fresh from the system. |
| Asian Greens (bok choy, mizuna, tatsoi) | 8 | ~$32 | 30-day turnover. Rapid, continuous yield. |
| Total | 36 | ~$176/month | ~$2,112/year |
The 24-Hole Ledger: Smaller Household, Same Principle
For one or two people, 36 holes produces more than most kitchens can consistently use. The 24-hole unit is sized for a real household — less volume, less waste, lower upfront cost.
| Crop | Holes | Monthly Supermarket Cost (organic equiv.) |
|---|---|---|
| Gourmet Lettuce | 8 | ~$40 |
| Culinary Herbs | 8 | ~$44 |
| Superfood Greens | 4 | ~$20 |
| Asian Greens | 4 | ~$16 |
| Total | 24 | ~$120/month — ~$1,440/year |
At $1,500 (Core) with $45/month operating cost, the net monthly saving is ~$75. Payback falls around Month 16. After that, you’re saving over $900 per year from roughly 10–15 minutes a week.
The Investment Side (36-Hole)
36-Hole Core Edition: $2,000 upfrontSystem Nutrients Pack: $45/monthAnnual operating cost: $540
In Year 1, your total outlay is approximately $2,540 (hardware + 12 months of nutrients).
Your total savings across Year 1: approximately $2,112.
You’re roughly $428 short of breakeven at the 12-month mark.
By Month 14, you’re fully paid back. From Month 15 onwards, you’re saving over $130 per month, every month, on food you’d otherwise buy regardless.
The Time Calculation
Here’s where it gets interesting.
Maintaining a 36-hole system takes roughly 15–20 minutes per week. That’s harvesting, reservoir checks, and the occasional sensor clean. Annualised, that’s about 13–17 hours of active tending across the year.
Divide $2,112 saved by 15 hours of effort.
That’s approximately $140 per hour — conservatively. Run the numbers on the Pro Edition with more precise nutrient management and higher-value variety selection, and you push closer to $180 per hour.
This is tax-free. In organic groceries. From your backyard.
We’re not the first to notice that growing your own food is financially rational. But we haven’t seen anyone run the number quite this precisely, so we did it ourselves.
What the Numbers Don’t Capture
The financial case is real, but it’s not the whole story.
Food quality: The lettuce you harvest 10 minutes before you eat it is categorically different to the lettuce that was cut three days ago in Goulburn and gassed in a modified atmosphere bag. The nutrients are different. The flavour is different. The waste is different.
Food security: A garden that produces continuously insulates you, at least partially, from price spikes. Lettuce prices in Australian supermarkets swung by over 200% during the 2022 floods. A hydro system in a sheltered backyard doesn’t care about floods in Queensland.
The time you don’t spend: If you add up the time spent driving to the supermarket, walking the produce aisle, and throwing away wilted herbs you didn’t get around to using — the 15 minutes a week the system takes starts to look like a bargain even before you factor in the savings.
The Honest Part
These systems are not for everyone. A $1,500–$2,000 upfront cost is real money, and we won’t pretend otherwise.
If you’re renting and likely to move in the next six months, this probably isn’t the right time. If your household gets through very little fresh produce, the numbers don’t stack up as cleanly. If you genuinely don’t want anything to do with plants, technology, or maintenance — there are better places to spend this money.
But if you cook regularly, you value fresh food, you travel enough to have killed plants before, and you’re tired of the weekly supermarket loop — the Harvest Ledger says this pays for itself. For years.
Explore the full TSG Hydro System range — 24-hole, 36-hole, custom builds, and the Founding 5 Builders deposit offer.