PK Boosters: When and How to Use Them in Flowering

Keep the base feed in place

Bloom A+B is the two-part flowering base feed. It supplies a blend tailored for flower and fruit development, with lower nitrogen and raised phosphorus and potassium compared with Grow A+B. PK 9/18 is a phosphorus and potassium supplement that fits a specific part of the chart. Understanding this relationship helps avoid the mistake of treating a supplement as the whole feeding programme. Each product has a separate role, and the supplied schedule is the reference for when that role is used.

Follow the published PK window

On the Monkey PK programme, PK 9/18 is shown at 2.5 ml per 10 litres in bloom week 4, 2.5 ml in week 5 and 5 ml in week 6. Those are the confirmed chart figures. Although the product description discusses flower onset and a mid-flower boost, there is no reason to invent an additional early-flower dose. The product’s analysis also requires confirmation: its name is PK 9/18, while older copy mentions a different phosphorus and potassium analysis. The website does not present either as a verified NPK figure.

PK or Resin, not both charts combined

The alternative Resin programme uses Resin at 10 ml per 10 litres in bloom weeks 3–8 instead of PK 9/18. Resin is described as a blend of bio-stimulants and carbohydrates for flavour and resin production without compromising crop size. The two programme toggles are there to keep the alternatives separate. Boost and Stress retain their own chart roles. Select the programme first, then choose the week and reservoir volume. Switching back and forth while mixing can create confusion even when individual measurements appear accurate.

Read the chart as a complete programme

The Monkey feeding chart is written as a ratio per 10 litres of water. Its headings distinguish vegetative growth, bloom and flush, and the programme toggle selects PK or Resin. Before measuring anything, check that the week on the screen is the week you intended. A veg week and a bloom week can share a number but involve different base feeds. The chart’s ranges should remain ranges in your notes. A displayed interval does not mean that the website has secretly chosen one precise value for your crop. Read the full row and the surrounding programme rather than lifting a number out of context.

The calculator is a convenient way to change reservoir volume without changing the underlying chart. Enter litres, choose the week and programme, and read the millilitres for each included product. If you double the water volume, the confirmed amounts double; if you halve it, they halve. A product without a confirmed dose is not automatically assigned one. This simple boundary is important: arithmetic can scale an instruction, but it cannot supply missing product guidance.

Keep water, medium and environment in the picture

Monkey nutrients are intended for UK hard and soft water and for coco, soil and hydro. That gives a common framework, but it is still worth describing the grow accurately. Write down your medium, water source and programme so that a conversation with a stockist begins with useful information. For coco, the chart explicitly calls for Monkey Mag Cal. Its dose still needs confirmation, so ask rather than borrowing another brand’s figure. More information is not the same thing as more bottles. Clear inputs and a readable schedule are often the best starting point for a productive question.

The chart also carries environmental reference information. It lists pH 5.5–6.5, temperature 20–27°C, and week-specific EC and humidity values. Normal and closed-room EC are separate rows; do not silently substitute one for the other. These figures belong to the supplied chart. They are not a full diagnosis of every indoor setup. A useful grow record captures what was measured and when, not merely what a target row said. If something changes, that record helps explain the sequence without relying entirely on memory.

Avoid solving an unknown problem with an unknown dose

When advice is missing, keep the gap visible in your own decision-making. A product name, a photograph or a bottle size cannot confirm an NPK analysis or a dilution rate. Monkey’s supplied information deliberately leaves some details open: Mag Cal dosing, Ultra Zyme’s technical instructions and certain size or analysis confirmations. The website hides unconfirmed fields instead of presenting guesswork as a specification. Your stockist can help you obtain the latest confirmed directions. Until then, an honest unanswered question is more useful than a confident invented answer.

Likewise, do not assume every supplement should run throughout every week. Root Shoot, Boost, PK 9/18 and Resin each have their own chart windows. Stress has a consistent role through the twelve growth and bloom weeks, but not a listed flush dose. Monkey Mist is a ready-to-use leaf spray, not a reservoir additive with a scaled millilitre instruction. Keeping these jobs distinct helps the system stay simple. If the crop or timetable differs from the chart, describe that difference before asking for a recommendation.

A practical next step for your grow

Start by opening the feeding chart and checking the programme you plan to use. Then read the relevant product page for its description, mechanism, ingredients and confirmed instructions. Safety data sheets are linked where supplied. A safety sheet is valuable for handling information, but should not be treated as a substitute for the feeding programme. Contact Monkey or speak with a stockist if something is unclear. The range was developed by UK growers with more than two decades of nutrient-industry experience, with more than two years of development and testing before its 2021 launch.

The aim is a system that growers can understand, trust and use with confidence, not a bottle for every unexplained problem. Choose a starter or expanded kit around an understood role, retain the correct programme and measure the actual reservoir volume. Keep your notes straightforward enough that you can explain the grow to somebody else. That is science made simple in practice: accurate information, a consistent schedule and no invented shortcuts. UK born. Grower led. Built from experience.

Before buying, separate confirmed availability from the product description. There are no published prices in this catalogue, and a size listed for one product is not automatically a size offered for another. Root Shoot sizes require confirmation, while Monkey Mist sizes are not supplied. Ask your stockist about the product and size you actually need. A website photograph can help identify a bottle, but does not override the current verified product information.

A good question to Team Monkey includes the product name, whether the grow is in veg or bloom, the medium and the water source. If you are asking about the chart, include the programme and reservoir litres too. Those details make it easier to keep the answer connected to your actual grow. Do not turn advice for a different stage into a new instruction without checking it. The system is intended to stay understandable from start to finish: roots, shoots and fruits, with health-support products used for clear, distinct purposes.