Emerald Harvest King Kola – 2.5 Gal

Emerald Harvest King Kola is a high-phosphorus, high-potassium bloom booster formulated to increase bud size and density during the flowering stage. Available in a 2.5-gallon jug, King Kola supplies the essential macronutrients flowering plants need and adds yield-boosting nitrogen sourced from hemp seed flour — a natural, nutrient-rich ingredient that Emerald Harvest introduced to the hydroponics market. It is designed to work alongside a base nutrient program, pushing heavier harvests without requiring a complete nutrient overhaul.

King Kola Specifications

The following table summarizes the key specifications for the Emerald Harvest King Kola 2.5-gallon size. Attributes are drawn from the canonical product data and manufacturer category information.

Specification	Value
Brand	Emerald Harvest
Product Name	King Kola
Size	2.5 gallons (9.46 L)
Product Type	Bloom Booster / Flowering Supplement
Primary Nutrients	Phosphorus, Potassium, Nitrogen (hemp seed flour-derived)
Category	Nutrients & Additives > Additives > Growth & Bloom Boosters
Weight (shipping)	23.9 lb
SKU	859041005440

Why Choose King Kola

King Kola addresses a common limitation of base nutrient programs during the bloom phase: most base nutrients supply adequate phosphorus and potassium for vegetative growth, but may not deliver the elevated levels that heavy-flowering crops demand when buds are forming. King Kola bridges that gap as a standalone supplement added on top of any base program.

What distinguishes King Kola from most other bloom boosters on the market is the inclusion of nitrogen derived from hemp seed flour. Hemp seed flour is a whole-food nitrogen source that also carries complex metabolic compounds and naturally occurring trace elements. Emerald Harvest states that introducing hemp seed flour into a commercial hydroponic supplement was an industry first at the time of King Kola’s development. This matters because it means the product does not rely solely on synthetic nitrate or ammoniacal nitrogen sources — the hemp-derived fraction delivers nitrogen alongside accompanying compounds that may support plant metabolism during flowering.

The 2.5-gallon jug size suits commercial and semi-commercial growers who are running King Kola through multiple feeding cycles and do not want to reorder weekly. At 23.9 lb shipped weight, the jug is substantial and requires proper storage on a level, stable surface. Growers working at smaller scale can find King Kola in 1-quart and 1-gallon sizes; the 2.5-gallon format reflects a commitment to consistent supplementation over a full season without interruption.

• High-P/K ratio for flower development: King Kola is formulated to deliver elevated phosphorus and potassium during the flowering window, the period when crops need these macronutrients most for bud formation and density.
• Hemp seed flour nitrogen source: Nitrogen in King Kola comes partly from hemp seed flour, an all-natural ingredient that Emerald Harvest introduced to the hydroponics supplement market and that no other product in this category contained at launch.
• Designed to stack with base nutrients: King Kola is a supplement, not a standalone nutrient line. It layers on top of an existing base program, making it compatible with any brand of two-part or three-part base without requiring a full system change.
• Commercial jug size: The 2.5-gallon format reduces per-gallon cost compared to smaller sizes and minimizes the number of refill orders during a long bloom run, which is practical for operators managing multi-plant canopies.
• Liquid concentrate: As a liquid, King Kola mixes readily into reservoir water without pre-dissolving and integrates easily into existing feed schedules.

Best Uses for King Kola

King Kola is specifically formulated for the flowering and fruiting stages of plant growth. The following use cases reflect the product category, the nutrient profile described in the canonical product data, and the growth stages where elevated phosphorus and potassium are most beneficial.

• Hydroponic bloom supplementation: Add King Kola to a recirculating or drain-to-waste reservoir during the transition into flowering and continue through the final weeks before flush. The high-P/K concentration helps push the flowering response that base nutrients alone may not fully support in high-yielding genetics.
• Coco coir and soilless media: Coco coir growers running standard base nutrients in a two-part or three-part format can introduce King Kola as a bloom additive to increase available phosphorus and potassium without switching their full nutrient program.
• Supplementing soil and organic grows: While King Kola is designed for hydroponic application, the inclusion of hemp seed flour as a natural nitrogen source makes it compatible with growers who prefer a partial organic approach. Used at the appropriate rate, it can add nutrient density to amended soil programs without introducing harsh synthetic spike nutrients.
• Commercial flowering crops: Growers cultivating dense-budding flowering crops across large canopies will benefit most from the 2.5-gallon size. The volume allows consistent use across multiple irrigation events without needing to swap containers mid-cycle.
• Stacking with Emerald Harvest base nutrients: King Kola pairs naturally with other Emerald Harvest products, including their two-part and three-part base nutrient lines. Growers already on the Emerald Harvest system can add King Kola without compatibility concerns.

King Kola vs Similar Bloom Boosters

The bloom booster category includes a wide range of phosphorus- and potassium-heavy supplements. Most are formulated around a straightforward high-PK mineral base. King Kola’s differentiating factor, as stated in the manufacturer’s product description, is the use of hemp seed flour as a nitrogen source. This sets it apart from products that rely exclusively on synthetic nitrate or urea nitrogen. The hemp-derived fraction provides nitrogen alongside naturally occurring complex metabolic compounds that are not typically present in purely synthetic formulations.

Growers evaluating King Kola against other bloom supplements should consider whether they want a purely synthetic PK booster or one that adds a natural nitrogen component during bloom. Many bloom boosters recommend reducing or eliminating nitrogen input during the late flowering stage to avoid late-season nitrogen toxicity; King Kola’s approach uses a naturally derived, lower-intensity nitrogen source alongside the P and K, so the nitrogen impact is tied to the hemp seed flour matrix rather than concentrated mineral nitrogen salts.

For growers looking for root-zone and microbial support to complement their bloom phase, products like Heavy 16 Roots are designed to strengthen root architecture during vegetative and early flowering stages, which can support nutrient uptake efficiency when a bloom supplement like King Kola is introduced. The two products serve different purposes but are complementary in a complete nutrient program.

Compatibility

King Kola is formulated as an additive that supplements a base nutrient program rather than replacing it. It is compatible with all common hydroponic growing methods, including deep water culture (DWC), nutrient film technique (NFT), ebb and flow, and drip systems. It is also used in coco coir and soilless media applications, as well as in amended soil grows where liquid supplementation is part of the feeding schedule.

Because King Kola is a liquid concentrate, it mixes readily into solution when added to reservoir water. Standard practice is to add supplements after the base nutrient parts are already dissolved, then adjust pH afterward. King Kola should be compatible with most commercial two-part and three-part base nutrient programs from any brand, though growers should always confirm EC and pH after mixing to ensure no precipitation or antagonism occurs with specific formulations.

Growers using multi-supplement stacks during bloom can layer King Kola with carbohydrate and enzyme products. For example, Earth Juice Hi-Brix Molasses is a carbohydrate supplement often used alongside bloom boosters to feed beneficial microbes in media and support brix levels in fruit and flower. These product types address different aspects of the bloom phase and can be used together as part of a complete flowering program.

Manufacturer-published compatibility charts and precise dose stacking tables are available on the Emerald Harvest website. Always verify that your final reservoir EC stays within the tolerance range for your specific crop and growth stage before committing to a full feeding cycle.

Dosing Guidelines

King Kola is used during the flowering and fruiting stages of plant development. It is not intended for vegetative growth feeding. Begin introducing King Kola once the plant has fully transitioned into flowering — typically when visible bud sites are forming and the plant is no longer in aggressive vegetative stretch. Continue through the mid-to-late flowering period, stopping a few days to a week before the final pre-harvest flush, depending on your crop protocol.

Emerald Harvest publishes a full feeding schedule for King Kola on their website that specifies dose rates in milliliters per gallon or milliliters per liter across each week of the flowering stage. The general framework for a liquid bloom booster like King Kola follows this progression:

• Early bloom (transition weeks): Start at a lower dose to let plants adjust to the elevated PK input. This prevents sudden EC spikes that can stress plants coming out of a vegetative regime.
• Mid bloom (peak flower development): Increase to the full recommended dose. This is when bud sites are actively setting and plants benefit most from additional phosphorus and potassium.
• Late bloom (finishing weeks): Some growers taper the dose slightly in the final 1–2 weeks as the focus shifts from building new bud mass to ripening and resin development. Follow Emerald Harvest’s published schedule for exact timing.
• Flush week: Discontinue King Kola and all supplements. Run plain pH-adjusted water or a commercial flushing agent to clear the root zone before harvest.

Always measure King Kola with a calibrated syringe or measuring cup, not by eye. After adding all nutrients and supplements, check EC with a calibrated EC/TDS meter and pH with a calibrated pH meter. Adjust pH to the appropriate range for your growing medium (5.5–6.2 for hydroponics and coco; 6.0–6.8 for soil) before delivering the solution to plants.

Growers running heavy supplement stacks should also consider whether adding a microbial inoculant, such as Advanced Nutrients Tarantula, to the root zone during the vegetative phase will support the plant’s ability to uptake the elevated PK levels introduced by King Kola during bloom. Strong root biology improves nutrient availability at the root interface.

How to Use King Kola

The steps below follow the standard protocol for introducing a liquid bloom booster supplement into a hydroponic or soilless feed program. For Emerald Harvest’s exact dose rates per week, refer to the feed chart available on their website before beginning.

1. Confirm growth stage: Begin using King Kola only after your plants have fully transitioned into flower. Applying a high-PK bloom booster during vegetative growth is not the intended use and may create nutrient imbalances.
2. Shake or stir the container: Before measuring, shake or invert the 2.5-gallon jug a few times to ensure any settled ingredients are fully re-suspended. Liquid concentrates can settle slightly between uses.
3. Measure the dose: Use a clean, calibrated measuring syringe or cup. Follow the Emerald Harvest feeding chart for the week-by-week dose rate. Do not estimate by eye when working with concentrates.
4. Add to reservoir water: Fill your reservoir or mixing bucket with fresh water first, then add your base nutrient parts in the order specified by your base nutrient manufacturer. Add King Kola after the base nutrients are mixed.
5. Mix thoroughly: Stir or allow pump circulation to fully dissolve and distribute all nutrients and supplements before measuring EC and pH.
6. Check EC and pH: Verify that the final EC is within the expected range for your crop and week of bloom. Adjust pH to 5.5–6.2 for hydroponic/coco or 6.0–6.8 for soil. Do not deliver the solution until both EC and pH are confirmed.
7. Deliver to plants: Feed according to your normal irrigation schedule. Monitor plant response (leaf color, bud development) over the following 24–48 hours and adjust future doses if signs of nutrient stress appear.
8. Clean equipment after use: Rinse measuring tools with clean water after each use. Store the King Kola jug in a cool location away from direct sunlight and out of reach of children.

Sources & Further Reading