What's actually in a bottle of synthetic cannabis nutrients — and what it costs to make it
By Alex Rumi
Most cannabis sold in Canada is grown with bottled synthetic mineral salts — nitrogen, potassium, phosphorus and the rest. They work. They're cheap, consistent, and precise. They're also the default, which is why "what was this plant fed?" has a fairly predictable answer for most products on the shelf.
The exception is certified organic cannabis, which has to meet a real third-party standard — in our case, FVOPA — which rules synthetic mineral salts out entirely. "Natural," "clean," and "green" on a label don't mean any of that; those words are unregulated,d and a producer can use them without doing the underlying work. “Organic” is the only term on a cannabis label that's backed by an audit.
The reason that matters is that synthetic mineral salts carry an environmental cost that's mostly invisible from the shelf. They carry it before the bottle is even sold, in how they're made — and after the plant is finished with them, in what runs off into the watershed. The "green" language wrapped around conventional cannabis never talks about it.
Of the three main nutrients in a synthetic mix — nitrogen, phosphorus, and potassium (the N, P, and K on every nutrient label) — nitrogen and potassium tell the two clearest stories. One is about energy. The other is about mining. (Phosphorus is mined like potassium and behaves similarly, so we'll come back to it when we get to runoff.)
Nitrogen is an energy story. The nitrogen plants need is all around us — it makes up about 78% of the air — but plants can't use it in that form. To turn atmospheric nitrogen into something a plant can absorb, the fertiliser industry uses the Haber-Bosch process: a chemical reaction that combines nitrogen from the air with hydrogen from natural gas to produce ammonia. Ammonia is the building block of every synthetic nitrogen fertiliser; once you have it, you can convert it into urea, ammonium nitrate, and the rest of what ends up in those bottles.
The catch is that Haber-Bosch is one of the most energy-intensive industrial chemical processes humans do at scale. It uses natural gas in two ways: as a source of hydrogen and as the fuel that powers the reaction at extreme heat and pressure. Producing a single tonne of ammonia releases more than two tonnes of CO₂. Globally, the synthetic nitrogen supply chain accounts for roughly 2% of greenhouse gas emissions — more than all of aviation. That's the cost of the "N" in a bottle of synthetic nutrients, before it's even shipped.
Potassium is a mining story. The "K" mostly comes from potash, which is mined from the ground. Potash mining has a long environmental record, and not a great one. Salinisation of soil and freshwater, ground subsidence where the surface sinks over old workings, and brine discharge that degrades rivers downstream of major operations. It's a heavy extractive industry, with the footprint that implies.
And then there's the back end. Whatever synthetic nitrogen and phosphorus the plant doesn't use doesn't vanish — it leaches and runs off into the watershed, where it feeds algae blooms that rot and strip the oxygen out of lakes and rivers. Nutrient runoff from conventional agriculture is one of the leading causes of water-quality degradation worldwide. So the bottle costs the planet on the way in and out.
Here's what we do instead, and I want to be precise about it because precision is the whole point of an organic claim.
Our farm is FVOPA-certified, the organic standard to which our entire operation is certified. That certification governs what we're allowed to put in the soil, and synthetic mineral salts aren't on the list. For our outdoor crop, the single amendment we feed the plants is alfalfa meal. That's it — one organic input, and the soil biology and the season handle the rest—nothing made in a gas-fired plant. Nothing mined. Nothing runs off into the watershed because there's nothing synthetic in the ground to run off.
Feeding a plant this way is slower and less precise than dialling in a synthetic feed chart. You're trusting soil biology to convert an organic amendment into plant-available nutrition on its own timeline, not flipping a number on a chart. We've built the whole farm around being patient with that. It's harder. It takes longer. You get lower yields and THC scores for years before it starts paying dividends. We think the result — and the absence of that environmental bill — is worth it.
The reason this matters to anyone standing at a cannabis counter is simple. Most cannabis on the shelf isn't organic — and behind the marketing words wrapped around the rest, there's usually a bottle of synthetic salts doing the actual work. The way to cut through it is to ask what the plant was fed. We have a one-ingredient answer for our outdoor crop: alfalfa meal. And we can tell you exactly what it isn't — a bottle of mineral salts that costs a lot more than the label suggests.
Alex Rumi is co-founder and Chief Strategy Officer at GOOD BUDS, an FVOPA Certified Organic cannabis farm on Salt Spring Island, BC. He has worked in the licensed Canadian cannabis industry since 2017.
