Emerald Harvest Cali Pro Grow B – Quart

Emerald Harvest Cali Pro Grow B is Part B of the Cali Pro 2-part base nutrient series, formulated for use during the vegetative stage of indoor crops. Combined with Cali Pro Grow A, it delivers nitrogen, phosphorus, potassium, and chelated trace elements — including iron, cobalt, manganese, and zinc — to support strong stalk and stem development and prepare plants for a robust harvest.

Cali Pro Grow B Specifications

The table below lists the confirmed specifications for the Emerald Harvest Cali Pro Grow B Quart, sourced from canonical supplier data and manufacturer documentation.

Specification	Value
Brand	Hawthorne Garden Company (Emerald Harvest)
Product Line	Cali Pro – 2-part base nutrient series
Part	Part B (Grow)
Volume	Quart (0.946 L / approx. 32 fl oz)
Growth Stage	Vegetative
Primary Macronutrients	Nitrogen (N), Phosphorus (P), Potassium (K)
Trace Elements	Chelated iron, cobalt, manganese, zinc
Shipping Weight	4.299 lb
SKU	HGC723902

Why Choose Cali Pro Grow B

Cali Pro Grow B is the second bottle in a matched two-part system. Using both Part A and Part B together gives you the complete macro and micronutrient profile that Emerald Harvest designed the Cali Pro series around. Here is what makes it worth using over generic single-part nutrients or mixing your own:

• Designed as a matched pair: Part A and Part B are formulated to complement each other. Each bottle contains nutrients that would precipitate or become unavailable if mixed in concentrate form, so splitting them across two parts ensures your plants receive the full intended nutrient profile when you mix them together in your reservoir or feed water.
• Nitrogen-rich for vigorous vegetative growth: The Cali Pro Grow formulation is high in nitrogen, which fuels leafy growth and allows plants to build the canopy, stalk girth, and branching structure they need before transitioning to flowering. A well-fed vegetative plant is better positioned for a productive bloom cycle.
• Phosphorus and potassium for structural support: Beyond nitrogen, Cali Pro Grow B also contributes phosphorus and potassium, supporting energy transfer within the plant and strengthening cell walls — critical for plants that will carry heavy fruiting loads later in the cycle.
• Chelated micronutrients: The inclusion of chelated iron, cobalt, manganese, and zinc means these trace elements are chemically bound in a form that remains available to the plant across a range of pH levels. Chelation reduces the risk of lockout that can occur with unchelated minerals, especially in hydroponic systems where pH swings are more common.
• Part of a complete Emerald Harvest system: Cali Pro Grow A & B are designed to work alongside the Cali Pro Bloom A & B for a seamless grow-to-bloom transition, giving you a single product line that carries your crop from seedling through harvest.

Best Uses for Cali Pro Grow B

Cali Pro Grow B is targeted at indoor growers running high-yield crops who want a reliable, predictable base nutrient without the complexity of building their own formulation from individual salts. It works best in the following situations:

• Hydroponic and recirculating systems: The chelated micronutrient package makes it well-suited to reservoir-based growing methods — deep water culture (DWC), nutrient film technique (NFT), and ebb-and-flow systems — where maintaining stable nutrient availability across pH fluctuations is important.
• Coco coir and soilless media: Coco coir and rockwool are inert substrates that depend entirely on the nutrient solution for plant feeding. Cali Pro Grow B delivers the nitrogen and micronutrients these substrates cannot supply on their own, making it a practical choice for growers running coco drip or top-feed setups.
• Vegetative stage feeding programs: Any time plants are in active vegetative growth — after transplant through the pre-flower stretch — a nitrogen-forward base nutrient like Cali Pro Grow A & B keeps growth steady and prevents the yellowing and slowdowns that nitrogen deficiency causes.
• Growers who supplement with microbial products: Because Cali Pro Grow B uses chelated mineral nutrition rather than organic decomposition, it pairs cleanly with microbial root inoculants. If you are running beneficial bacteria and fungi alongside your base nutrient, you can do so without worrying about the base nutrient suppressing microbial activity.
• Indoor high-yield crops requiring structured feeding: The formulation specifically targets high-yield indoor cultivation. If you are pushing yield density in a controlled indoor environment, the balanced NPK ratio in Cali Pro Grow is calibrated for that kind of production intensity.

Cali Pro Grow B vs Similar 2-Part Base Nutrients

Two-part base nutrients are common in indoor hydroponic growing, and most brands offer a vegetative and bloom variant. Here is how Cali Pro Grow B fits relative to other 2-part options you might encounter:

Many growers compare the Cali Pro series to other two-part professional base nutrients. The key distinction Emerald Harvest builds around is the chelated micronutrient inclusion in the base formula itself — iron, cobalt, manganese, and zinc are delivered as part of the base rather than requiring a separate micronutrient supplement bottle. This reduces the number of products needed in a basic feed program. Some competing two-part systems keep micronutrients separate, meaning growers who want full micronutrient coverage need to purchase an additional additive.

For growers already using root inoculants or enzyme products such as root stimulants formulated for hydroponic use, the Cali Pro base provides a compatible mineral foundation. The two-part structure also gives growers flexibility to adjust Part A and Part B independently if running specialized feeding strategies, though standard use calls for equal parts A and B mixed at the recommended dose.

If your grow uses a simpler media like coco or rockwool and you want a complete base without building a multi-bottle program from scratch, Cali Pro Grow A & B represents a straightforward entry point into a full Emerald Harvest feed program.

Compatibility

Cali Pro Grow B is formulated for use in hydroponic and soilless growing environments. The following compatibility notes are based on the product type and manufacturer descriptions:

• Growing media: Compatible with hydroponic systems, coco coir, rockwool, perlite, and other inert or soilless substrates. Not formulated for use as a standalone soil amendment.
• Pairing requirement: Must be used together with Cali Pro Grow A. Part B is not a standalone complete nutrient; the two-part system depends on both bottles being added to the reservoir to achieve the full intended nutrient profile.
• Bloom transition: When plants enter the flowering stage, switch from Cali Pro Grow A & B to Cali Pro Bloom A & B. The Bloom series is formulated with a different phosphorus and potassium emphasis suited to fruit and flower development.
• pH range: As with most mineral nutrient concentrates, Cali Pro Grow B should be used within a pH-adjusted feed solution. Typical hydroponic target range is 5.5–6.5, with 5.8–6.2 being a common target for most crops. Adjust pH after mixing nutrients, not before.
• Supplement stacking: Compatible with the broader Emerald Harvest additive line. If you are supplementing with root tonics, enzyme products, or carbohydrate additives such as plant-available carbohydrate supplements, add the base nutrient first, then additives, and check EC and pH before use.

Dosing Guidelines

Cali Pro Grow B is a concentrated liquid nutrient. Always measure carefully and add to water, not the other way around. The following guidelines reflect standard practice for a 2-part base nutrient system; consult the Emerald Harvest feed chart on hawthornegc.com for crop-specific dosing schedules.

1. Start with clean, pH-adjusted water at your target starting pH. If your source water is high in calcium or magnesium, account for that in your overall nutrient plan.
2. Add Cali Pro Grow A first, measuring the recommended dose per gallon or litre. Stir or agitate to incorporate before adding Part B. Never mix Part A and Part B together in concentrate form — add each separately to the reservoir or mixing vessel.
3. Add Cali Pro Grow B at the same dose rate as Part A, unless a specific feed chart indicates otherwise. Equal parts A and B is the standard starting point for most crops.
4. Add any additional supplements (enzymes, root tonics, carbohydrate sources) after the base nutrient. Mix thoroughly after each addition.
5. Check EC (electrical conductivity) to verify the nutrient strength is within the target range for your crop and growth stage. Early vegetative plants typically need lower EC than mid-to-late veg plants. Adjust concentration up or down based on your target range.
6. Check and adjust final pH to your target range (5.8–6.2 for most hydroponic crops) after all nutrients and additives have been mixed. pH naturally shifts when nutrients are added, so always finalize pH last.
7. Change or top off reservoir regularly. In recirculating systems, top off with plain pH-adjusted water between nutrient changes to compensate for water uptake, and do a full reservoir change every 7–10 days to prevent salt buildup.

How to Use Cali Pro Grow B

Cali Pro Grow B is straightforward to incorporate into an existing feeding program. The key rules are: always add to water, never pre-mix concentrates together, and always verify EC and pH after mixing.

1. Fill your reservoir or mixing container with the desired volume of clean water. Room-temperature water is preferable for dissolving concentrates evenly.
2. Measure Cali Pro Grow A using a calibrated syringe, measuring cup, or dosing pump. Add to the water and stir.
3. Measure Cali Pro Grow B at the same dose rate and add to the reservoir. Do not mix A and B together in their concentrated forms — always dilute each separately into the main water volume.
4. Add any Emerald Harvest or compatible additives one at a time, mixing after each addition. Keep a mixing log so you can replicate or troubleshoot a batch.
5. Test EC with a calibrated meter. Compare to your target EC range for the current growth stage and plant size. If EC is too high, dilute with plain water. If too low, add more nutrient solution.
6. Test and adjust pH to your target range using a calibrated pH meter and pH up/down solutions as needed. Final pH check should always be the last step before delivering the solution to your plants.
7. Deliver the mixed solution to your growing system via drip, ebb-and-flow, hand watering, or reservoir top-off, depending on your setup. Store any unused mixed solution in a sealed container away from direct light, and use within 24–48 hours for best results.

Sources & Further Reading