Grow More Mendocino Flower & Bloom (6-30-30)

Grow More Mendocino Flower & Bloom (6-30-30) is a 100% water-soluble powder fertilizer designed for the flowering and fruiting stage. Its 6-30-30 NPK ratio delivers low nitrogen alongside high phosphorus and potassium to firm fruits, size flowers, and support the final weeks of a bloom cycle. Part of the Mendocino Producer’s Choice line, it includes calcium, magnesium, chelated DTPA/EDDHA iron, carbohydrates, and amino acids in a formula with no artificial dyes or colorings.

Grow More Mendocino Flower & Bloom Specifications

Key specifications for the Grow More Mendocino Flower & Bloom (6-30-30), based on manufacturer product data and supplier documentation.

Specification	Value
Brand	Grow More
Product Line	Mendocino Producer’s Choice
SKU	GR58143
NPK Ratio	6-30-30
Formulation Type	100% water-soluble powder
Pack Size	25 lb (approx. 25.02 lb net weight)
Added Macronutrients	Calcium, Magnesium
Chelated Iron	DTPA/EDDHA Iron
Organic Additives	Carbohydrates, amino acids
Dyes / Colorings	None (no artificial dyes or colorings)

Why Choose Grow More Mendocino Flower & Bloom

The Mendocino Flower & Bloom 6-30-30 is built specifically for growers who need a low-nitrogen, high-phosphorus and high-potassium feeding program during the reproductive stage of growth. Here is what the manufacturer documents about this product’s formulation and application profile:

• High P+K for bloom and fruit development: The 6-30-30 ratio intentionally limits nitrogen to allow phosphorus and potassium to drive flowering, fruit sizing, and hardening. This is useful in the final weeks of the cycle when nitrogen demand drops and plants require elevated P and K to finish properly.
• 100% water-soluble powder: The Mendocino line is formulated as a fully soluble powder, meaning it dissolves cleanly in water without sediment or clogging. This is practical in drip and recirculating hydroponic systems where solubility matters for emitters and pumps.
• Complete micronutrient package: Beyond the macronutrient ratio, the formula includes calcium, magnesium, and DTPA/EDDHA chelated iron. The dual chelation system (DTPA active at lower pH, EDDHA active across a wider range) helps maintain iron availability across different system pH levels.
• Carbohydrates and amino acids included: The manufacturer includes carbohydrates and amino acids as quality-enhancing elements. These are described as supporting plant metabolism and nutrient uptake efficiency during the bloom phase.
• No artificial dyes or colorings: Grow More specifies that the Mendocino line contains no artificial dyes or colorings. For growers monitoring solution color as a diagnostic indicator, this avoids interference from synthetic pigments.
• Flexible application: The product is documented for use as a standalone base nutrient or as an additive layered on top of a base nutrient program, depending on what the crop requires at the time of application.

Best Uses for Grow More Mendocino Flower & Bloom

Based on the manufacturer’s described use cases and the product’s NPK profile, this fertilizer is suited to specific scenarios in both commercial and small-scale growing environments:

• Mid-to-late bloom phase in hydroponic systems: In deep water culture, NFT, ebb-and-flow, and drip systems, growers transition to lower-nitrogen formulas as flowering progresses. The 6-30-30 ratio fills this role without requiring a separate P/K booster.
• Fruit and vegetable finishing: The manufacturer specifically documents this product for situations where high amounts of phosphate and potassium are needed to firm or size fruits and vegetables. This makes it relevant for tomato, pepper, cucumber, and similar fruiting crops in controlled environments.
• Coco coir growing: Coco coir has relatively low native nutrient buffering and requires a fully water-soluble feed that can be delivered precisely. The Mendocino 6-30-30 is listed by the manufacturer as suitable for coco systems.
• Soilless and organic soil media: The product is documented for use in soilless mixes and organic soils, covering both synthetic hydro setups and amended living-soil grows where a soluble bloom supplement is needed.
• Growers who prefer additive-free powder concentrates: For operations that mix their own nutrient solutions from dry components and want to avoid artificial dyes interfering with solution color monitoring, this product fits. Pairing it with a calcium-magnesium source like a biological additive or a dedicated calmag supplement is common practice in coco and RO-water systems.
• Commercial scale applications: At 25 lb per bag, the packaging is sized for commercial or semi-commercial production. Dry concentrates also have a longer shelf life and lower shipping weight per unit of nutrient compared to liquid formulas.

Grow More Mendocino Flower & Bloom vs Similar Products

When selecting a bloom-phase powder fertilizer, the main differentiators are NPK ratio, micronutrient completeness, solubility, and pack size. The Grow More Mendocino 6-30-30 sits in the high-P-and-K category alongside other water-soluble bloom powders. Here is how its documented characteristics compare to the general category:

Vs. general-purpose liquid bloom nutrients: Liquid bloom nutrients typically ship pre-diluted, which means more weight and volume per unit of active nutrient. A 25 lb dry powder like the Mendocino 6-30-30 is significantly more concentrated per dollar when factoring freight and storage. The tradeoff is that powder requires accurate weighing and mixing rather than the simplicity of pouring a liquid. For hobbyists making small batches, liquids can be more forgiving. For growers mixing large reservoirs or running a commercial feed program, powders are generally more cost-effective.

Vs. single-component P/K boosters: Products that provide only phosphorus and potassium (with no calcium, magnesium, or iron) require additional supplementation to avoid deficiencies. The Mendocino 6-30-30 includes calcium, magnesium, and chelated iron in the same formula, reducing the number of separate additives needed. This is a practical advantage when managing a simplified feed program during bloom. If you are running a coco coir system and want to explore targeted root-zone biology alongside bloom nutrition, products like Earth Juice Hi-Brix Molasses can be used alongside a base bloom powder to feed microbial populations.

Vs. alternate-supplier pricing: The same product (SKU GR58143) is available through alternate distributors at significantly higher price points. Purchasing through Premier Hydro at the current price provides access to the same 25 lb bag at a lower cost per pound compared to alternate channel pricing observed for this SKU.

Compatibility

The manufacturer documents the Mendocino Flower & Bloom 6-30-30 as compatible with the following growing systems and conditions:

• Hydroponic systems: Deep water culture, NFT, drip, ebb-and-flow, and recirculating systems. The 100% water-soluble formulation is suited to systems where undissolved solids would clog emitters or pumps.
• Soilless media: Perlite, rockwool, expanded clay, and other inert media where all nutrition comes from the feed solution.
• Coco coir: Listed by the manufacturer as a compatible substrate. Note that coco coir systems typically require additional calcium and magnesium supplementation; the Mendocino 6-30-30 includes Ca and Mg in its formula.
• Organic soils: The manufacturer lists organic soils as a compatible environment. In amended soil grows, this product would be applied as a liquid feed mixed into water and applied to the root zone.
• Standalone or enhancer role: Depending on the feeding program, the product can serve as the primary base nutrient or as a bloom-phase enhancer layered on top of an existing base formula. If you are running a root-stimulating program early in the grow, products like Heavy 16 Roots can serve the vegetative phase while the Mendocino 6-30-30 takes over during bloom.

The manufacturer does not publish specific EC or pH target ranges in the product description. As a standard practice for water-soluble nutrients in recirculating hydroponic systems, a reservoir pH of 5.8–6.2 is typically appropriate. Verify EC against crop-specific feeding charts and adjust dose accordingly.

Dosing Guidelines

The manufacturer does not publish a specific dose rate in the available product description for this SKU. The following guidelines reflect standard practice for water-soluble bloom powders of this type and should be treated as a starting point. Consult the Grow More label or technical documentation for verified application rates before use.

1. Determine your water volume: Measure the total reservoir or mix volume in gallons or litres before calculating dose. Using a calibrated measuring vessel avoids overfeeding.
2. Weigh the powder: Water-soluble powder fertilizers should be measured by weight, not by volume, for accuracy. Use a digital gram scale. Typical bloom powder doses are in the range of 1–5 grams per gallon depending on the product and crop stage, but verify against the Grow More label for this formula specifically.
3. Pre-dissolve in a small volume of water: Mix the measured powder into a small amount of warm water first to ensure complete dissolution before adding to the full reservoir. This prevents undissolved clumps from entering the system.
4. Add to reservoir and mix: Pour the dissolved concentrate into the reservoir while circulating or stirring. Allow full mixing before measuring EC.
5. Check EC and pH: After mixing, verify EC is within the target range for your crop and growth stage. Adjust pH to 5.8–6.2 for hydroponic systems or 6.0–6.5 for soilless and organic soil applications.
6. Monitor and adjust weekly: During the bloom phase, plant uptake rates change week to week. Measure runoff EC and adjust feed concentration as needed to avoid salt buildup or nutrient deficiency.
7. Final flush: In the last 1–2 weeks before harvest, consider reducing or eliminating nutrient inputs. If using a flushing agent, refer to that product’s protocol. Products like PureCrop1 can be used during this period to support plant health without adding nutrients.

Sources & Further Reading