Grow More Mendocino All Purpose (20-20-20) 25 lb HGC721574

Grow More Mendocino All Purpose 20-20-20 is a fully water-soluble powder fertilizer from the Mendocino Producer’s Choice line, formulated to deliver a balanced 20-20-20 NPK ratio alongside calcium, magnesium, chelated iron, carbohydrates, and amino acids in a single product. The 25 lb bag covers high-volume feeding programs across hydroponic, coco coir, soilless, and organic-soil growing environments for ornamental and agricultural crops at every growth stage.

Grow More Mendocino All Purpose 20-20-20 Specifications

The following table covers the confirmed technical specifications for the Grow More Mendocino All Purpose 20-20-20 (25 lb, SKU HGC721574) derived from manufacturer and supplier documentation.

Specification	Value
Product Name	Mendocino All Purpose 20-20-20
Brand / Line	Grow More / Mendocino Producer’s Choice
SKU	HGC721574
NPK Analysis	20-20-20
Pack Size	25 lb (approximately 11.3 kg)
Formulation	100% water-soluble powder
Secondary Nutrients	Calcium, Magnesium
Micronutrient / Iron Form	DTPA/EDDHA chelated iron
Organic Additives	Carbohydrates, amino acids
Colorings / Dyes	None (no artificial dyes or colorings)
Compatible Media	Hydroponic, soilless, coco coir, organic soil; field and greenhouse

Why Choose Grow More Mendocino All Purpose 20-20-20

The Mendocino All Purpose 20-20-20 is positioned in Grow More’s Mendocino Producer’s Choice line as a versatile, all-stage fertilizer for growers who want a complete nutrient solution in a single powder. Here is what distinguishes it from a basic commodity 20-20-20 formula:

• Complete micronutrient package in one bag. Beyond NPK, the formula supplies calcium, magnesium, and chelated iron (DTPA/EDDHA), which are commonly deficient when growers use a bare-bones 20-20-20 salt and have to supplement separately. The DTPA/EDDHA chelation keeps iron available across a wider pH range than standard EDTA chelates.
• Carbohydrates and amino acids included. The formula incorporates carbohydrate and amino acid components alongside the mineral salts. These are listed by Grow More as quality-enhancing elements in the Mendocino line, supporting plant metabolism without requiring a separate additive purchase.
• No artificial dyes or colorings. The Mendocino Producer’s Choice line is formulated without added colorants, which simplifies visual EC and pH monitoring since the solution color reflects only organic matter already present in the formula.
• Dual-role flexibility. The balanced 20-20-20 ratio means this formula can function as a standalone base nutrient during the vegetative phase or be dialed in as a bloom stimulant support when NPK needs to stay even. Growers running a simplified nutrient program can lean on a single product rather than managing a multi-part A/B system.
• Bulk 25 lb size reduces per-gallon cost. The 25 lb bag is designed for commercial greenhouse operations, field growers, and larger indoor gardens. Compared to smaller retail sizes, the bulk format lowers the cost per mixed gallon significantly when feeding at scale.

Best Uses for Grow More Mendocino All Purpose 20-20-20

The Mendocino All Purpose 20-20-20 is described by Grow More as suitable for a broad range of growing applications. The following use cases are derived from the product’s description and category placement:

• Hydroponic and recirculating systems. The formula is 100% water soluble with no insoluble residue, making it appropriate for drip, NFT, DWC, and other recirculating hydroponic setups where undissolved salts would clog emitters or foul reservoirs.
• Coco coir and soilless media. Coco coir is a low-CEC medium that relies almost entirely on the nutrient solution for plant feeding. The inclusion of calcium and magnesium in the same formula addresses the elevated Ca and Mg demand that coco coir growers frequently encounter.
• Organic and amended soils. The formula is listed as compatible with organic soils, making it usable as a soluble top-dress or fertigated supplement in living soil gardens where growers want a quick-acting, water-soluble feed without switching to a separate synthetic-only program.
• Greenhouse and field ornamentals. Grow More describes this as a formula for ornamental and agricultural crops grown in greenhouses or field conditions, covering flowering annuals, perennials, vegetable transplants, and container nursery stock.
• Vegetative and bloom phases. The even 20-20-20 ratio supports the product’s role as an all-purpose base in both vegetative feeding programs (where high nitrogen is beneficial) and as a balanced supplement during bloom when growers want to maintain even phosphorus and potassium levels without inducing a large NPK imbalance.
• High-volume commercial feeding programs. The 25 lb bulk size is well-suited to commercial operations running large reservoir volumes, automated fertigation systems, or frequent batch mixing where a smaller retail container would be impractical.

Mendocino All Purpose 20-20-20 vs Similar Products

A balanced 20-20-20 water-soluble formula is a common format in professional horticulture. The Grow More Mendocino version differentiates itself from generic 20-20-20 commodity fertilizers primarily through its inclusion of secondary and micronutrients and organic additive fractions in a single package.

Generic 20-20-20 products from commodity manufacturers typically supply only the three primary macronutrients. A grower running a generic 20-20-20 will generally need to add a separate calcium-magnesium supplement and an iron chelate to prevent deficiencies in hydroponic and coco coir systems. The Mendocino formula includes these elements in the base product, which reduces the number of separate bottles or bags required for a complete feeding program.

Within the 20-20-20 segment, the EDDHA iron chelate is notable. EDDHA maintains iron solubility at pH values up to approximately 9, whereas the more common EDTA chelate becomes unavailable above pH 6.5. For growers working in slightly alkaline water or soils, the DTPA/EDDHA combination provides more reliable iron availability without requiring pH to be driven very low.

Growers comparing the Mendocino line to other Grow More product lines should note that this is an all-purpose formula rather than a stage-specific one. If you are also running a microbial or enzyme program in your reservoir, pairing with a product like Advanced Nutrients Tarantula can support root-zone biology alongside the mineral program.

Compatibility

Grow More Mendocino All Purpose 20-20-20 is listed as compatible with the following growing environments and systems:

• Hydroponic systems: Suitable for recirculating and run-to-waste hydroponic systems including DWC, NFT, ebb-and-flow, and drip irrigation. Full water solubility prevents emitter clogging.
• Soilless media: Compatible with perlite, rockwool, expanded clay (LECA), and other inert soilless media where the nutrient solution is the sole plant food source.
• Coco coir: The included calcium and magnesium address coco’s inherent cation exchange properties that can lock out Ca and Mg from external nutrient solutions.
• Organic soils: Listed by Grow More as suitable for organic soil gardens as a water-soluble supplement or fertigated application.
• Greenhouse and field environments: Designed for both greenhouse-controlled conditions and open-field agricultural use for ornamental and food crops.

For growers supplementing a larger program with root-stimulating additives, products such as Heavy 16 Roots are compatible alongside water-soluble base nutrients in most recirculating hydroponic systems. When combining fertilizers, always mix each component separately into water before combining in the reservoir to prevent localized precipitation.

The DTPA/EDDHA chelated iron in this formula provides reliable micronutrient availability across the typical hydroponic pH range of 5.5–6.5 and remains effective at slightly higher pH values encountered in organic soil applications.

Dosing Guidelines

Grow More does not publish a generic dose rate in the canonical product documentation available for this listing. The following guidelines are based on standard water-soluble powder fertilizer practice for professional horticultural use. Verify with Grow More’s published feed charts before scaling to production runs.

1. Starting rate: A common starting rate for balanced 20-20-20 water-soluble fertilizers in hydroponic and soilless systems is 1–2 grams per liter (approximately 4–8 grams per gallon) of water, adjusted by growth stage and target EC. Begin at the lower end and raise based on plant response and measured EC.
2. Target EC range: Mix until the EC of the nutrient solution falls within the target range for the crop and growth stage. Seedlings and cuttings typically run 0.8–1.2 mS/cm; vegetative plants 1.5–2.5 mS/cm; fruiting and flowering crops 2.0–3.5 mS/cm. Adjust dose accordingly.
3. pH adjustment: After dissolving the powder and confirming EC, adjust solution pH to 5.8–6.2 for hydroponic and coco coir applications, or 6.0–6.5 for soilless and organic soil applications, using a calibrated pH meter and appropriate up/down solutions.
4. Frequency: For recirculating hydroponic systems, replace or refresh the reservoir every 7–14 days or when EC drops significantly. For run-to-waste and soil applications, apply at every watering or on a scheduled fertigate/water rotation based on crop needs.
5. Monitoring: Check runoff EC from soil or coco media weekly to detect salt accumulation. Flush with plain pH-adjusted water if runoff EC exceeds 1.5× the feed EC. Adjust dosing based on visual plant response, particularly leaf color and internode spacing.

For growers running organic soil programs that also use a carbohydrate supplement, consider whether additional supplementation is needed given that this formula already contains carbohydrates and amino acids. Products such as Earth Juice Hi-Brix Molasses can complement a balanced mineral program in living soil environments, but adjust total carbohydrate loading to avoid excess.

How to Mix and Apply

The following steps cover standard preparation and application of water-soluble powder fertilizers. These are general guidelines for the product type; consult Grow More’s published feed charts for crop-specific rates.

1. Fill reservoir or mixing vessel with fresh water. Start with your target volume of clean, pH-neutral source water. Using water at room temperature (18–24°C / 64–75°F) speeds dissolution of powder fertilizers.
2. Measure the dose. Weigh the powder on a calibrated gram scale or use a calibrated measuring spoon. Do not estimate by volume alone; powder density varies. Start at the low end of the recommended dose range for the first application.
3. Add powder to water — not water to powder. Pour the measured powder directly into the water and stir or circulate vigorously until fully dissolved. The formula is described as 100% water soluble; any undissolved material may indicate contaminants in the water or product degradation.
4. Verify EC and pH. After mixing, measure the EC of the solution to confirm the dose is within the target range for the growth stage. Then adjust pH to the appropriate range (5.8–6.2 for hydro/coco, 6.0–6.5 for soil) using calibrated pH meters and up/down solutions.
5. Apply to plants. Deliver the mixed solution via drip irrigation, hand watering, flood-and-drain, or NFT channel as appropriate for your system. For foliar applications, apply at reduced concentration (typically 50% of reservoir strength) in the early morning or late evening to avoid leaf burn.
6. Store remaining powder properly. Reseal the bag tightly after each use and store in a cool, dry location away from direct sunlight and moisture. Properly stored water-soluble powder fertilizers maintain potency for extended periods; clumping or discoloration may indicate moisture ingress.

Sources & Further Reading