Mills Feed Chart – Regular Line, Osmosis Doses

Mills Nutrients' own published Regular schedule for reverse-osmosis water. Week by week, in millilitres per litre.

Mills print four versions of this schedule and they are not interchangeable. Two are for the Regular bottles and two for the thicker High Concentrate bottles, and each of those comes in a tap-water and a reverse-osmosis version. So check the label on the bottle you own, then check what you are filling the tank with. This page is Regular on RO water. If your bottles say High Concentrate, use the High Concentrate osmosis chart instead.

Mills Regular feed chartOsmosis water · coco, hydro or soil · tap to enlarge

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• All dosesper 1 litre
• pH5.5 – 6.5
• Base feed2.5–5.5ml of each of A and B

Basis A and Basis B always go in at the same amount as each other. The week number starts again at 1 when flowering begins.

Every figure is millilitres per one litre of water, not per ten. A 10-litre watering can needs ten times these numbers, so 5ml of Basis A becomes 50ml. Get that wrong and the feed is ten times too weak.

Getting it right

• Read the dose as per litre. Most brands print per 10 litres, Mills print per litre. It is the single easiest mistake to make with this chart.
• This is the RO chart. It assumes water that has been through a reverse-osmosis filter and reads EC 0.0. On ordinary tap water the same bottles are dosed lower, because the tap is already supplying some of the calcium and magnesium.
• Regular is not the High Concentrate line. The labels carry the same product names but the liquid is a different strength, and the High Concentrate figures are roughly a third of these. Never run one line's numbers with the other line's bottles.
• One chart covers coco, hydro and soil. Mills say so themselves, which is unusual — most brands publish a separate schedule per medium. The medium changes how often you water, not how much goes in the tank.
• Mixing order matters. Vitalize goes into the water first, then Basis A, then Basis B in the same amount, then the stimulants. Never pour two concentrates together before they hit the water.
• Keep pH between 5.5 and 6.5 and expect EC to climb from about 1.3 in early growth to about 2.8 at peak bloom. Set the strength first, correct the pH after.
• Grow is only two weeks on this chart. If you veg for longer, hold the Grow 2 figures until you flip the lights, then start at Flower 1.

Everything on the chart

Common questions

Which of the four Mills charts do I need?

Two questions. First, are your bottles Regular or High Concentrate — it says so on the label. Second, is your water straight from the tap or through an RO filter. That gives you one chart of the four, and this one is Regular on RO water. The High Concentrate versions are here for tap water and here for osmosis water.

Why are the osmosis doses higher than the tap ones?

Because RO water is empty. The filter strips out the calcium, magnesium and other salts your tap was already supplying, so the chart puts all of it back through the bottle.

Does this really work in soil as well as coco and hydro?

Yes. Mills publish a single schedule and state it can be used on all mediums. What changes between them is watering frequency and how much runoff you aim for, not the amount of nutrient in the tank.

What does 5ml per litre mean in a watering can?

Multiply by however many litres the can holds. A 5-litre can takes 25ml, a 10-litre can takes 50ml. Measure the 0.1ml and 0.2ml Vitalize figures with a syringe.

Are you also running an organic line?

Mills publish a separate Organics feed chart for their Base, Grow, Cal and Bloom bottles. Different products, different figures, three grow weeks instead of two.

Shop the full Mills range

Figures as published by Mills Nutrients on their own growth charts page, mills-nutrients.com. Always read the label on the bottle you own. Mills Nutrients is a trade mark of its owner.