Skip to content
With FREE UK DELIVERY on orders over £50!
Pay As You Grow with Klarna

Mills C4

Price£47.99

Mills C4.

The bloom stimulator that gets flowering off to a flying start.

Mills C4 is a highly concentrated bloom stimulator from Dutch brand Mills Nutrients, made with a complex mix of sugars, vitamins, amino acids, humic and fulvic acids and cold-pressed Irish kelp. It’s used from week 2 to week 6 of flowering at 0.5ml to 1.5ml per litre, in soil, coco or hydro, and comes in 1L and 5L bottles.


  • Encourages Early Flower Sets
  • Carbohydrate-Rich Formula
  • Amino, Humic & Fulvic Acids
  • Cold-Pressed Irish Kelp
  • Denser, Heavier Fruit
  • Richer Flavour & Aroma
  • Tiny Dose - 0.5ml to 1.5ml Per Litre
  • 100% PGR Free

The Opening Act That Matters Most.

Flowering is the main event. Everything before it is rehearsal.

And like any great show, the opening minutes decide whether the audience stays in their seats.

Get the first weeks of flowering right and your plants set flowers and fruit in abundance. Get them wrong and you spend the rest of the season wishing you hadn’t.

Mills C4 arrives at precisely that moment, from week 2 of flowering, and gives your plants a serious shove in the right direction.



Four Ingredients. One Mission.

Open the bottle and you’ll find a properly sophisticated blend.

Sugars and carbohydrates top up the plant’s energy supply. L-amino acids help release carbohydrates around the roots. Humic and fulvic acids improve water and feed uptake while conditioning your medium.

And cold-pressed Irish kelp brings natural auxins and cytokinins to the party.

Mills believe the wider the spectrum, the better the result. C4 is that philosophy, bottled.



Sweeter. Denser. Heavier.

Here’s where it gets delicious.

C4 helps your plants produce natural oils and sugars, which is precisely what you taste and smell at harvest time.

Tomatoes, peppers, chillies and strawberries respond with denser, heavier fruit and noticeably better flavour.

It’s the difference between a good crop and the one your neighbours keep asking about.



Tiny Dose. Big Boom.

C4 is seriously concentrated, so a little goes a very long way.

Start at 0.5ml per litre in week 2 of flowering, work up to 1.5ml per litre, then hand the baton to Mills Ultimate PK for the final stretch.

Simple.

Precise.

Remarkably good value.



Mills C4 Technical Specification

Brand Mills Nutrients (Netherlands)
Product Type Bloom stimulator / early flowering booster
Key Ingredients Sugars and carbohydrates, vitamins, L-amino acids, humic and fulvic acids, cold-pressed Irish kelp
Stage of Use Flowering, weeks 2 to 6
Dosage 0.5ml to 1.5ml per litre
Follow With Mills Ultimate PK from week 5 of flowering
Suitable Media Soil, coco and hydroponics
PGR Free Yes
Sizes 1L, 5L


Product includes:

  • 1 x Mills C4 bottle (your chosen size)

0 / 0