How to Use Rock Resinator

This guide explains how to use Rock Resinator bloom booster for maximum resin production — correct dosing, timing, and expert tips from The Horticulture Company.

Written by Simon

Using Rock Resinator bloom booster correctly will make a real difference to your results. Rock Resinator is a bloom booster that’s earned a loyal following among experienced growers for one simple reason: it works. The formula centres on highly available phosphorus and potassium — the two macronutrients that drive flower development, density, and weight — but it also includes metabolic boosters that push essential oil production well beyond what a standard PK additive achieves. Importantly, it contains no Plant Growth Regulators (PGRs), so results are natural and the end product is clean.

What Does Rock Resinator Do?

Rock Resinator’s NPK profile is 0-7-8 — a potassium-forward PK formula specifically tuned for the flowering period. The phosphorus supports energy transfer within the plant and drives flower site initiation, while the elevated potassium promotes cell expansion, increases turgor pressure within developing flowers, and plays a central role in essential oil and sugar synthesis.

The metabolic booster component pushes the plant’s own chemistry harder, resulting in noticeably pungent, sweet-smelling aromas and a density of flowers that straightforward PK boosters often can’t match. Many growers report visible improvements in flower hardness and aromatic intensity within the first two weeks of use.

Because it’s a mineral-based feed with no PGRs or heavy organic compounds, it won’t block drippers, lines, or emitters — making it well suited to drip-fed systems, NFT, and recirculating hydro setups.

Rock Resinator Dosage and Feeding Schedule

The standard dose is 1ml per litre. For more aggressive results, this can be increased to 2ml per litre. Rock Resinator’s recommended schedule builds progressively through flowering to match the plant’s increasing nutrient demand as flowers develop and harden.

The schedule below is based on doses per 4 litres of nutrient solution:

• Bloom Weeks 2–3: 4ml per 4L (1ml/L)
• Bloom Week 4: 6ml per 4L (1.5ml/L)
• Bloom Week 5: 8ml per 4L (2ml/L)
• Bloom Week 6: 10ml per 4L (2.5ml/L)
• Bloom Week 7: 12ml per 4L (3ml/L)
• Flush Week 8: 14ml per 4L (3.5ml/L)
• Flush Week 9: 14ml per 4L (3.5ml/L)

For significantly increased results, Rock Nutrients suggest doubling the amounts above. If you choose to push higher doses, monitor your plants closely for signs of nutrient excess — tip burn, clawing, or unusually dark leaf colour — and back off if needed.

Using Rock Resinator During Flushing

One of the more unusual aspects of Rock Resinator is its continued use during the flush period. Unlike most bloom boosters that are discontinued a week or two before harvest, Rock Resinator is designed to be applied right up to the end. This is because the formula supports essential oil production in the final ripening stage — a period when many growers unknowingly leave aromatic potential on the table by cutting additives too early.

How to Use Rock Resinator

• Shake the bottle well before measuring — product can settle
• Add to your nutrient solution and mix thoroughly before feeding
• Use at every watering from week 2 of bloom onwards
• Always check EC after adding Rock Resinator — the dose contributes to total solution strength
• Adjust pH after the full mix is combined

When to Start

Begin using Rock Resinator at the start of week 2 of the flowering phase, once flower sites are clearly visible and beginning to develop. Starting in week 1 is generally too early — plants still transitioning from vegetative growth don’t have the root and leaf structure to utilise the PK load effectively. From week 2 through harvest, apply at every watering.

Compatible Growing Systems

Rock Resinator is genuinely versatile and performs well across all common indoor growing methods:

• Soil: Great for soil grows — the progressive dose build matches how soil plants typically take up nutrients during bloom
• Coco coir: Apply at every feed; coco growers typically see excellent results with mid-to-high dose ranges
• Hydroponics: Mineral-based formula won’t block lines — suitable for NFT, DWC, and recirculating drip systems

It works alongside all base nutrient brands and can be stacked with other additives that don’t duplicate PK — such as enzyme products, beneficial bacteria, or amino acid supplements.

Rock Resinator at a Glance

• NPK ratio: 0-7-8
• Contains no PGRs — natural, clean results
• Starting dose: 1ml per litre (buildable to 2ml+)
• Start week: Week 2 of bloom
• Continue through: Harvest (including flush weeks)
• Available sizes: 1 litre, 5 litre

Frequently Asked Questions

Is Rock Resinator PGR-free?

Yes — Rock Resinator contains no Plant Growth Regulators. This is an important distinction from some other bloom boosters on the market that use PGRs to artificially inflate flower density. Rock Resinator achieves its results through genuine nutrient delivery and metabolic stimulation.

Can I use Rock Resinator during the flush?

Yes, and Rock Nutrients actually recommend it. The final weeks of flowering are when essential oils reach peak production, and Rock Resinator supports that process right up to harvest. Continue at the week 8–9 dosage during your flush period.

Will Rock Resinator block my irrigation lines?

No. Because it’s a mineral-based formula without heavy organic compounds, it stays fully dissolved in solution and won’t clog drippers, emitters, or hydroponic pipework.

Can I use Rock Resinator alongside other bloom boosters?

It can be stacked with additives that don’t duplicate its PK content — enzyme products, amino acids, beneficial microbes, and silicon supplements all pair well. Avoid adding a separate PK 13/14 on top of Rock Resinator as this will push potassium and phosphorus levels too high.

Where can I buy Rock Resinator in the UK?

We stock Rock Resinator Heavy Yields in both 1 litre and 5 litre sizes. For hobby growers, the 1L bottle offers excellent value at standard doses. If you’re running a larger space with multiple plants, the 5L is more economical per litre.

Related Articles

• Nutrients and Additives Guide — complete hub
• The Plant Magic Feed Charts

Further Reading From The Horticulture Company

For more expert growing guides, our nutrients and additives guide explains how to build an effective feed programme, while our LED grow lights comparison and grow tents guide help you optimise your growing environment. The indoor growing environment guide covers temperature, humidity and CO₂, and the complete UK grow tent guide takes you through setup from scratch.

For authoritative guidance on plant nutrition and health, the Royal Horticultural Society publishes evidence-based growing advice used by professionals and hobbyists alike. Visit The Horticulture Company’s store in Kenilworth, Warwickshire, or browse our full range of products and guides online.