Description

Enhance your flowering stage with Mills Ultimate PK, a premium bloom additive designed to maximise flower size, density and overall yield. Formulated for serious growers, this high-phosphorus and potassium solution provides essential nutrients at the critical flowering phase, helping plants reach their full flowering potential.

Read the full product overview here...

Mills Ultimate PK is a concentrated phosphorus (P) and potassium (K) additive, designed to support the final stages of flowering. By delivering high levels of these key nutrients, it encourages larger, denser flowers, improved fruit set and stronger overall plant structure.

Compatible with Mills Basis A & B or other base nutrient programs, this bloom booster is easy to integrate into your feeding schedule and is suitable for soil, coco and hydroponic systems. Mills Ultimate PK is ideal for growers who want to push flowering performance and achieve higher quality yields.

Key Features & Benefits

  • High Phosphorus & Potassium: Supports vigorous flowering and flower development.
  • Maximises Flower Size & Density: Encourages fuller, heavier blooms.
  • Enhances Nutrient Uptake: Improves plant efficiency in absorbing base nutrients.
  • Easy to Use: One-part formula, simple to mix into nutrient solutions.
  • Versatile Application: Works with hydroponics, coco coir and soil setups.
  • Compatible with Base Nutrients: Complements Mills Basis A & B for complete feeding.
  • Optimised for Late Flowering: Perfect for final weeks before harvest to boost yield and quality.

How to Use

  • Shake well before use.
  • Dosage: Add 1 to 3 ml per litre of water, adjusting according to plant size and growth stage.
  • Timing: Apply during mid-to-late flowering, typically from week 4 of bloom until harvest.
  • Mixing: Combine with your base nutrient solution, ensuring even distribution and correct pH.

Frequently Asked Questions (FAQ)

When should I start using Mills Ultimate PK?
Begin during mid-to-late flowering, around week 4, when phosphorus and potassium demands increase for optimal flower development.

Can I use it with all grow mediums?
Yes, Mills Ultimate PK is compatible with soil, coco coir and hydroponic systems.

Is it a complete nutrient?
No, it is a bloom booster additive and should be used alongside your base nutrient program.

Will it work in hard water?
Yes, formulated to perform reliably in both soft and hard water conditions.

During the late flowering phase, plants require increased phosphorus and potassium to maximise flower formation, density and final yield. Mills Ultimate PK supplies these nutrients in a highly available form, ensuring flowers develop to their fullest potential. By supporting strong, heavy and high-quality blooms, it’s an essential additive for growers looking to enhance flowering performance and achieve exceptional harvests.

Explore the range

See all Additives & Boosters (153)

Not sure which one is right for your setup? Message us on WhatsApp or call 0121 553 7872.

Delivery, returns and FAQs

Will my order arrive in plain packaging?

Yes. Every order is sent in plain, unbranded packaging as standard.

How quickly will my order arrive?

Order standard size items by 12pm on a working day and choose Next working day at checkout, and your order will be with you the next working day. Standard delivery takes 2 to 3 working days.

Bulky items such as grow tents, large fans and 50L bags of soil go by courier in 2 to 3 working days, or on a pallet for very heavy orders. Next day is not available for these, and if your basket includes a bulky item the whole order travels with it.

UK delivery is free on orders of £94.99 or more, except for bulky items. See our delivery page for full prices.

Can I collect from the shop?

Yes. Choose Click & Collect at checkout and pick up for free from our shop at Unit 2 Black Lake, West Bromwich, B70 0PJ. Orders are usually ready within 1 hour.

Can I return an item?

You have 14 days from receiving your order to tell us you want to cancel, then a further 14 days to send it back. Items need to be unopened and in a resaleable condition.

If you change your mind, the return postage is paid by you. If something arrives faulty or damaged, send us photos within 48 hours and we will cover the cost of putting it right. Full details are in our refund policy.

Do you price match?

Yes. If you find the Mills Ultimate PK Bloom Additive cheaper at another UK retailer, use the Price Match button on this page. We usually reply within one business day.

Need help choosing?

Speak to our team. Call us on 0121 553 7872, message us on WhatsApp, or visit the shop in West Bromwich.

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