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Mills Substrates Organic are made for growers who want an organic root zone that still feels clean and controlled. No mystery nutrition in the bag, no heavy additives, no awkward learning curve. Just two organic, vegan-certified peat blends, each built for a different style of growing.
If you like steering your feed from day one, Mills Organic Soil is the blank canvas. It’s a premium, vegan-certified, OMRI-listed growing medium made from a fine blend of white and black peat. It’s light and fluffy, perlite-free, and it’s not fertilised, which gives you maximum control over nutrient input. It’s also designed for propagation (starting seeds and young plants) and for running a full cycle with the Mills Organic nutrient range.
If you want a richer start with less feeding in the first month, Mills Vegan All Mix is the loaded option. It’s a unique vegan recipe built for soil life, fully fertilised with enough organic and vegan nutrients for the first 4 weeks of growth. Like Organic Soil, it uses a fine blend of white and black peat, but this one comes packed with organically and vegan-sourced macro and micronutrients. Mills also adds bacillus (beneficial bacteria) to help cycle nutrients and keep them plant available for maximum uptake.
Organic Soil = control and flexibility.
Vegan All Mix = a strong head start with a pre-fed base.
Mills Organic Soil is vegan certified, OMRI listed, perlite-free, and not fertilised for maximum control
Mills Vegan All Mix is fully fertilised with organic and vegan nutrients for the first 4 weeks of growth
Both are based on a fine blend of white and black peat, built for growers who want an organic substrate that behaves predictably
Vegan All Mix includes bacillus to support nutrient cycling and uptake
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With Mills Organic Soil, you decide exactly what goes in and when. That’s ideal if you already run a feed schedule you want to keep, or if you like measuring inputs. Or if you want to match the substrate to the Mills Organic nutrient programme without guessing what’s already in the medium. It’s also a good choice for propagation because it’s light, fluffy, and designed to support early development without pushing nutrients too soon.
This mix is pre-fertilised for the first four weeks, so you can get through the early stage with less feeding and still keep growth moving. It’s a proper all mix for growers who want an organic, vegan medium that arrives ready to work. The added bacillus is there to keep nutrients cycling and available, which matters in organic growing because you’re relying on the soil biology to do part of the job.
For Organic Soil, treat it like a controlled substrate. Set your pots, water in, and start feeding when the plant is established and asking for more. This medium is built to run a full cycle with the Mills Organic nutrient line, so it fits growers who want a consistent routine without hidden nutrition in the bag.
For Vegan All Mix, use it as a pre-fed base for the early stages of growing. Keep watering habits sensible and avoid overwatering, because the mix already contains enough organic nutrition for roughly four weeks.
