Sustainable cannabis: your questions answered
By Alex Rumi
Common questions about cannabis and the environment, answered directly.
Is outdoor cannabis better for the environment than indoor?
Generally, yes. Outdoor cannabis uses sunlight and natural climate instead of artificial lighting, heating, cooling, and dehumidification, which removes the largest energy cost in cannabis production. Indoor cultivation's trade-off is control — year-round output regardless of weather — at a much higher energy footprint. The outdoor trade-offs are a single annual harvest, weather exposure, and lower yield per square foot.
What is the most sustainable way to grow cannabis?
The lowest-footprint approach combines several practices: growing outdoors in sunlight, reusing living soil rather than a single-use medium, feeding organic amendments rather than synthetic mineral salts, and irrigating with captured rainwater rather than drawing on municipal or well water. Each one removes a different category of production waste — energy, medium, inputs, and water.
Does organic cannabis pollute less than conventional cannabis?
It can, mainly through what it avoids. Conventional cultivation uses synthetic nitrogen and phosphorus, which run off into waterways and drive algae blooms that deplete oxygen in lakes and rivers. Certified organic cultivation prohibits synthetic mineral salts, so there's no synthetic nutrient runoff from the farm. In Canada, the relevant cannabis-specific organic standard is FVOPA certification.
Why is synthetic fertiliser bad for the environment?
Two reasons. Synthetic nitrogen is made by burning natural gas through the Haber-Bosch process, making it one of the most carbon-intensive industrial chemicals — the supply chain accounts for roughly 2% of global greenhouse gas emissions. Synthetic potassium comes from potash mining, which causes soil and freshwater salinisation and ground subsidence. In addition to manufacturing costs, unused synthetic nutrients run off fields and pollute downstream waters.
Is cannabis packaging or cannabis production worse for the environment?
Production is the larger footprint. Packaging is the visible waste — the tube, the bag, the humidity pack — and it's worth reducing, but it accounts for a smaller share of a product's total environmental cost. Production waste — growing medium, energy, synthetic inputs, and runoff — is larger and largely invisible to consumers.
What is living soil and why does it matter for sustainability?
Living soil is a biologically active soil system that's reused across many crop cycles rather than replaced after each harvest. It matters environmentally for two reasons: it eliminates the single-use growing medium (plastic pots, rockwool) that conventional cultivation discards at each cycle, and it reduces the need for bottled synthetic nutrients because soil biology feeds the plant with organic amendments.
Does organic cannabis mean zero waste?
No — organic and low-waste aren't the same thing, and it's worth separating them. Organic certification governs what goes into the plant: no synthetic mineral salts or pesticides. That eliminates the manufacturing footprint and the runoff from those inputs, which is a real reduction.
But an organic grow can still generate plenty of production waste. Many organic producers buy pre-mixed organic substrate and organic nutrients, grow a crop, then discard the spent medium and start the next cycle with a fresh batch. The inputs are cleaner, but the single-use pattern is the same — soil in, soil out, every harvest.
Regenerative growing is the part that closes that loop. Instead of replacing the medium, you reuse the same living soil cycle after cycle, amending it rather than discarding it. That's the difference between organic and regenerative: organic is about what you feed the plant; regenerative is about not throwing the soil away to do it. GOOD BUDS does both — certified organic inputs and living soil beds that have run continuously since 2019, indoors and out.
What questions should I ask to find genuinely sustainable cannabis?
Three:
How was it grown — outdoor, greenhouse, or indoor?
What was it fed — organic amendments or synthetic salts?
Where did the water come from?
A producer doing the work will have a specific answer to each. Vague "all-natural" or "eco-friendly" labelling without those specifics is the signal to keep asking.
Where DO GOOD BUDS fit?
GOOD BUDS is an FVOPA Certified Organic farm on Salt Spring Island, BC, and Canada's first licensed outdoor cannabis producer. Most of its cannabis is grown outdoors in living soil that's been reused since 2019, fed organic amendments rather than synthetic salts, and irrigated entirely with captured rainwater. It's a real-world example of the low-production-waste end of each question above.
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.
