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Ultimate PK Mills Nutrients – Premium Flowering Booster for Harder & Heavier Buds

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Take your harvest to the next level with Ultimate PK by Mills Nutrients. This powerful liquid hardener is designed for the final weeks of flowering, providing the essential Phosphorus and Potassium your plants need to gain weight and density. Compatible with all substrates, it ensures cleaner roots, intense aromas, and a professional finish. Don't settle for airy flowers; get the density you deserve.
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343.00€ taxes included
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490.00€
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-30%
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Ultimate PK by Mills Nutrients is the definitive flowering hardener designed to transform good crops into legendary harvests. This advanced liquid bio-mineral supplement provides the exact shot of Phosphorus and Potassium your plants need in the final stretch to maximize weight, density, and resin production without altering the natural flavor.

Is your harvest falling short of its potential?

You know the feeling: you've spent months controlling the climate, watering, and pampering your girls, but when the moment of truth arrives, the flowers feel airy, light, and lack that "rock-hard" density you see in magazines. It's frustrating to put in 100% of the effort for only 70% of the results.

If you ignore this phase, you are literally throwing money and time away. Failing to provide the necessary elements during the critical fattening weeks means losing grams per watt, weaker terpenes, and a final product that dries out too quickly and loses its bag appeal. Don't let your hard work vanish into thin air just before the finish line.

The solution is Ultimate PK. This isn't just another additive; it's heavy artillery for your grow room. By introducing this booster, you ensure that every ounce of energy the plant has is directed toward swelling the calyxes and coating them in trichomes. It turns potential disappointment into a record-breaking yield.

Why Ultimate PK is the secret weapon for your grow

Mills Nutrients has developed a formula that stands out because it doesn't just dump minerals into the soil; it ensures they are absorbed. Unlike cheap boosters that can block your drippers or burn your roots, Ultimate PK acts as a deep cleaner for the root zone while feeding it.

It is perfect for growers who want professional results without needing a degree in chemistry. Whether you use soil, coco, or complex hydroponic systems, this product integrates perfectly, keeping the nutrient solution stable and your plants hungry for more.

Key features and benefits (FAB)

  • Optimal Phosphorus and Potassium Ratio: It provides exactly what the plant craves in the last weeks, which translates into heavier, denser, and harder flowers.
  • Enriched with Microelements: Contains Boron, Copper, Iron, Manganese, and Zinc. This prevents late-stage deficiencies, ensuring the plant stays healthy enough to produce resin until the very last day.
  • Deep Cleaning Effect: Its composition helps keep the root zone and irrigation lines clean. This means better nutrient absorption and less risk of salt buildup.
  • Bio-Mineral Technology: Combines the best of organic and mineral worlds. You get the explosive yield of minerals with the complex flavor profile of organics.
  • Universal Compatibility: Works in any medium. You gain the flexibility to use it regardless of your setup.

Typical objections and clear answers

We know you might have doubts before adding another bottle to your shelf. Here is the reality:

  • You think "boosters are just marketing hype." In reality, during the last weeks, the plant's demand for P and K spikes drastically. Without an extra supply like Ultimate PK, the plant simply cannot build more mass physically.
  • You think "it might burn my plants." In reality, Mills is famous for its balance. If you follow the dosage, it is extremely safe and clean, much gentler than harsh chemical powders.
  • You think "it's expensive." In reality, it's highly concentrated (you only use it for 2-4 weeks). The increase in the final weight of your dry harvest pays for the bottle ten times over.

How to use Ultimate PK safely and effectively

To get those magazine-cover buds, follow these simple steps during the flowering stage:

  1. Preparation: Shake the bottle vigorously before opening. Ensure your base water is at the correct temperature (around 20-22°C).
  2. Timing: Start using it during the last 2 to 4 weeks of flowering. This is when the fruit/flower is already formed and needs to fill out.
  3. Dosage: Mix 2 ml of Ultimate PK per liter of water.
  4. Combination: Use it alongside your base cannabis fertilizers (Basis A&B). It works best as part of the full Mills line but boosts any regimen.
  5. The Final Step: Stop using it when you begin the root flush (usually 1 week before harvest) to ensure the cleanest flavor.

Frequently Asked Questions

Can I use Ultimate PK with other nutrient brands?

Yes, absolutely. While it is designed to work synergistically with Mills Basis A&B, its high-quality composition makes it an excellent PK booster to supplement any base nutrient brand you are currently using.

Does this product affect the pH of my water?

Mills products are known for being pH stable, but adding concentrated P and K can slightly alter the solution. Always measure and adjust your pH after adding all nutrients to the water, not before.

Is it suitable for autoflowering strains?

Yes! Autoflowers love a good PK boost in their final weeks. Just keep an eye on the plant's reaction; if they are sensitive genetics, you might want to start with 1.5 ml/L and work your way up.

Personal Experience of Pevgrow’s CEO (Alan)

I've tested dozens of boosters over the years, and honestly, many of them just leave salty residues that ruin the flavor. When I switched to Mills Ultimate PK, the first thing I noticed wasn't just the weight, but the hardness of the nugs. You know that sound when you drop a dry bud on a tray and it sounds like a stone? That's what this stuff does.

My advice: don't get greedy and use it too early. Wait until the flowers are fully formed (usually week 5 or 6 depending on the strain) and then hit them with the 2ml dose. The swelling you see in those final 14 days is insane. It’s one of the few products that stays in my rotation regardless of what strain I'm growing because it guarantees that the harvesting day is always a celebration.

Cultivation phase: Cultivation phase Flowering
Properties: Properties Root washing
Brands: Brands Mills Nutrients


  • Is the shipping discreet?

    Yes, the shipment is 100% discreet, no one will know what you have bought, also the sender is SITE OF SHOPS ONLINE.

  • Do you ship worldwide?

    Yes, we ship to almost every country in the world although you need to know the current legislation in your country to make sure that you do not break any regulations with the germination of the seeds.

    UK: 3-4 days (express)
    USA: 4-5 days (express)
    Australia: 4-5 days (express)
    Japan: 4-5 days (express)
    Canada: 4-5 days (express)
    South Africa: 4-5 days (express)
    New Zealand: 5-7 days (express)
    View all

    The customer must be informed about the laws of their country regarding seeds or other products that may be purchased on our website, the possession of which may constitute a criminal offence in the country of receipt.

    We cannot be made responsible for the wrong use that some people decide to give to the seeds, so please don't act against your national laws.

    Due to problems with customs you can check here for restrictions to certain countries.

  • What payment methods and currencies do you accept?

    We accept the following payment methods: Bank transfer, Cryptocurrencies, cash, credit and debit cards and cash on delivery (Spain, Belgium, France, Italy, Portugal).

    You can change the currency on the top right to know the price of the products in your local currency and of course pay this way.

  • How long does it take to ship my order?

    In 24/48 hours we will ship your order.

  • Are the seeds guaranteed to germinate?

    If you live in a country where the cultivation of cannabis is legal and you decide to plant the seeds, it is good that you know that all the seeds that we commercialize have germination guarantee.

    If you germinate with the method of paper napkins and you have followed all the steps that we indicate here, you will only have to return us the seeds not germinated in their original packaging and when we receive them we will proceed to the change.

    Then we take care of requesting the return to the seed bank, we do not transfer this responsibility and time to our customers.

  • What if I receive a bad or damaged product?

    If you receive a broken product due to transport, you have to notify us within 24 hours for insurance coverage, always contact us as soon as possible and we will fix the problem!

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