Emerald Harvest Cali Pro Grow A – Quart

Emerald Harvest Cali Pro Grow A – Quart is Part A of the Cali Pro 2-part base nutrient series, formulated for the vegetative stage of high-yield indoor crops. It provides a nitrogen-rich macronutrient profile alongside phosphorus, potassium, and chelated trace elements including iron, cobalt, manganese, and zinc to build strong stalks, stems, and root structure before the flowering phase begins.

Cali Pro Grow A – Quart Specifications

The following table summarizes key product specifications derived from manufacturer documentation and supplier data.

Specification	Value
Brand	Emerald Harvest (Hawthorne Garden Company)
Supplier SKU	HGC723894
Product Type	2-Part Base Nutrient Concentrate – Part A
Container Size	1 Quart (32 fl oz / ~0.95 L)
Shipping Weight	4.26 lb (1.93 kg)
Primary Macronutrients	Nitrogen (N), Phosphorus (P), Potassium (K)
Trace Elements	Chelated iron, cobalt, manganese, zinc
Intended Growth Stage	Vegetative

Why Choose Emerald Harvest Cali Pro Grow A

Cali Pro Grow A is designed to function as one half of a complete, two-component base nutrient system. Using both Part A and Part B together provides a full spectrum of primary and secondary nutrients in a balanced ratio suited to the vegetative growth phase. Here is what distinguishes this product for indoor growers:

• Nitrogen-rich vegetative formula. The formulation is deliberately high in nitrogen during the vegetative stage, when plants require this element most to build leaf mass, elongate stems, and develop a strong structural framework before transitioning to flower.
• Phosphorus and potassium support for the full crop cycle. Cali Pro Grow A also supplies phosphorus and potassium, which are essential for root development and enzyme activity even during early vegetative growth, and which prime the plant for the transition to bloom.
• Chelated trace element package. The inclusion of chelated iron, cobalt, manganese, and zinc helps ensure uptake of these micronutrients across a range of pH conditions. Chelation increases solubility and bioavailability, reducing the risk of deficiencies that can impair chlorophyll production and enzyme function.
• Part of a matched grow-and-bloom system. Cali Pro Grow A and B are designed to work alongside Cali Pro Bloom A and B, allowing growers to stay within a single nutrient line from propagation through harvest. Using a matched system simplifies nutrient scheduling and reduces compatibility risks when mixing products from different manufacturers.
• Liquid concentrate format. The liquid concentrate is easy to measure, mixes readily in water, and is suitable for both reservoir-based hydroponic systems and soil or coco media where liquid nutrients are applied to the root zone.

Best Uses for Emerald Harvest Cali Pro Grow A

This product is intended for indoor-grown, high-yield crops during the vegetative phase. The following use cases reflect the product’s design and label guidance:

• Hydroponic reservoir systems (DWC, NFT, ebb-and-flow). Mix Part A and Part B separately into the reservoir at the recommended dose rates, then combine. This prevents salt precipitation that can occur when concentrated A and B formulas are mixed directly together before dilution.
• Coco coir and soilless media. Cali Pro Grow A performs well in coco coir and perlite mixes where growers maintain full control over nutrient input. It can be applied through drip irrigation or hand-watering on a standard feed schedule aligned with vegetative growth.
• Indoor soil grows requiring supplemental feeding. For soil-grown plants that require additional nitrogen and trace element support beyond what the growing medium provides, Cali Pro Grow A can be diluted to a lower dose and applied during the active vegetative period.
• Pairing with a grow light upgrade. Growers investing in high-output lighting — such as a 600W ceramic HPS grow light bulb or a T5 fixture — often increase feeding intensity to match higher photosynthetic rates. Cali Pro Grow A is a straightforward starting point for scaling nutrient programs alongside lighting upgrades.

Cali Pro Grow A vs Similar 2-Part Base Nutrients

Two-part base nutrients are common in indoor horticulture because splitting the nutrient concentrate into two bottles allows manufacturers to include ions that would precipitate out of solution if stored together in high concentrations (such as calcium and phosphate). Cali Pro Grow A occupies the same category as other 2-part systems from brands like General Hydroponics, Advanced Nutrients, and Botanicare.

The key practical difference between systems tends to come down to formulation philosophy (e.g., pH-buffering additives, chelation strategy, and NPK ratios at each growth stage) and concentration strength, which affects the dose rate per gallon and the number of gallons each bottle produces. Cali Pro Grow A is positioned as a straightforward, direct-application vegetative base without proprietary additives that would require purchasing additional products to activate. Growers who already use an Advanced Nutrients program — such as pH Perfect Sensi Bloom Part A — and are evaluating alternatives may find the Cali Pro line comparable in structure, though the NPK ratios and pH targets differ between the two formulations and should be cross-checked before switching.

The quart size is appropriate for smaller grows or for growers who want to trial the Cali Pro system before committing to larger volumes. The price per gallon of prepared solution is comparable to other mid-range base nutrients sold in the same size class.

Compatibility

Cali Pro Grow A is designed for use with Cali Pro Grow B. These two components are intended to be used together at equal or manufacturer-specified ratios during the vegetative stage. Using Part A without Part B will produce an incomplete nutrient profile.

The Cali Pro Grow series is compatible with the Cali Pro Bloom A and B products for growers who wish to run the full Emerald Harvest base nutrient program from vegetative stage through flowering and fruiting.

In terms of grow environment compatibility:

• Hydroponic systems: DWC, NFT, ebb-and-flow, drip, aeroponics — the liquid concentrate dissolves readily in water for reservoir-based growing.
• Soilless media: Coco coir, perlite, rockwool, and similar inert substrates where the grower controls all nutrient inputs.
• Soil: Can be used in amended soils where supplemental liquid feeding is part of the grow program, typically at reduced dose rates.
• Grow tents and enclosed environments: If you are running a controlled environment such as a 4×4 grow tent, Cali Pro Grow A fits into a standard reservoir-fed nutrient schedule without any additional infrastructure requirements.

Manufacturer-published compatibility data beyond these general guidelines is not available in the current product documentation. Consult the Hawthorne Garden Company product pages for the most current formulation and mixing notes.

Dosing Guidelines

Cali Pro Grow A is a 2-part base nutrient concentrate and must be used in combination with Cali Pro Grow B. The following guidelines are based on general practice for 2-part base nutrients of this type. Growers should consult the official Emerald Harvest feed schedule published on the Hawthorne Garden Company website for exact dose rates by growth stage and system type.

• Always add Part A and Part B separately to water. Never mix the two concentrates directly together before dilution. Add Part A to the reservoir or feed water first, stir thoroughly, then add Part B and stir again.
• General starting dose: For most 2-part base nutrients in this concentration class, a starting rate of 1–2 mL per liter (approximately 4–8 mL per gallon) of each part is typical during early-to-mid vegetative growth. Adjust upward or downward based on EC/TDS measurements of the prepared solution.
• Target EC range: During vegetative growth, a prepared nutrient solution EC of approximately 1.2–2.0 mS/cm is typical for most cultivars. Sensitive or young plants should start at the lower end of this range.
• pH target: Maintain solution pH between 5.5 and 6.5 for hydroponic systems, or 6.0–7.0 for soil and coco. Measure pH after adding all nutrient components and adjust if needed.
• Transition to bloom: When plants begin showing pre-flower signals or are transitioned to a 12/12 light schedule, switch from Cali Pro Grow A and B to Cali Pro Bloom A and B according to the manufacturer’s feed schedule.

Note: The dose rates above are general guidance based on the product type and are not derived from the specific manufacturer label for this product. Always follow the printed label and the official Emerald Harvest feed chart for accurate dosing.

How to Use Cali Pro Grow A

1. Shake the bottle thoroughly before measuring. Nutrient concentrates can settle or separate between uses, so agitation ensures a consistent mixture when you dose.
2. Prepare your water first. Fill your reservoir, mixing bucket, or watering can with the desired volume of fresh water at room temperature. Starting with water reduces the risk of nutrient lock-out that can occur when concentrates contact each other undiluted.
3. Add Cali Pro Grow A. Measure the appropriate volume of Part A using a calibrated syringe or measuring cup. Add it to the water and stir or circulate thoroughly before adding any other nutrient components.
4. Add Cali Pro Grow B separately. Once Part A is fully incorporated, measure and add Part B. Stir or recirculate the solution again.
5. Add any supplements. If you are using additional products such as root stimulators, enzymes, or pH adjusters, add them after the base nutrients and mix well between each addition.
6. Check and adjust EC. Use a calibrated EC/TDS meter to verify the solution is within the target range for your plants’ growth stage. Add more water to dilute or more nutrient to increase EC as needed.
7. Adjust pH. Check pH with a calibrated meter and adjust to your target range using a pH up or pH down solution. Allow the solution to stabilize for a few minutes before taking a final reading.
8. Apply to plants. Deliver the prepared solution to your reservoir or apply directly to the root zone. Monitor plants and runoff EC/pH over the following days and adjust your next mix accordingly.

Sources & Further Reading