General Hydroponics FloraGro 3-Part Hydroponic Nutrient

General Hydroponics FloraGro

Vegetative growth demands nitrogen-heavy nutrition to build the structural foundation that determines final yields—yet most single-bottle formulas lock you into fixed ratios that can't adapt as plants transition from seedling to aggressive vegetative growth. FloraGro delivers 2-1-6 NPK as the vegetative component of the legendary FloraSeries 3-part system, providing the nitrogen-focused nutrition that drives vigorous growth when combined with General Hydroponics FloraMicro Nutrients and General Hydroponics FloraBloom Nutrients in customizable ratios.

This isn't a standalone vegetative nutrient. FloraGro is the essential growth component of the FloraSeries system that's been the hydroponic industry standard since 1976. The nitrogen-heavy 2-1-6 formula allows you to manipulate N-P-K ratios throughout vegetative development by adjusting the proportions of all three parts. Seedlings need gentle nutrition and often benefit from General Hydroponics RapidStart Nutrients to build root mass, while established vegetative plants require aggressive feeding (maximum FloraGro), and transitioning plants benefit from reduced nitrogen by decreasing FloraGro as you increase FloraBloom. This precision has made FloraSeries the choice of growers who refuse to compromise.

For over 40 years, FloraGro has proven itself across every growing method—hydroponics, coco, soil, rockwool, and water culture. The 2% nitrogen combined with 6% potassium and 0.5% magnesium ensures plants receive balanced vegetative nutrition without the excessive nitrogen that causes weak, stretchy growth. When mixed with FloraMicro and FloraBloom, you create complete, customizable nutrition that adapts to your specific cultivars and growing conditions. To strengthen plant cell walls and increase resistance to environmental stress, many growers also integrate General Hydroponics Armor Si Nutrients during this stage rather than forcing plants to adapt to rigid formulas.

Features

🌱

Vegetative Growth Formula

2-1-6 NPK ratio delivers nitrogen and potassium for vigorous structural development

⚙️

3-Part System Component

Combines with FloraBloom and FloraMicro for customizable complete nutrition

🎯

Adjustable Nitrogen Control

Dial in precise nitrogen levels for seedlings, vegetative growth, or flowering transition

💪

Balanced Growth Support

Prevents excessive stretch with balanced N-K ratio and magnesium for photosynthesis

🌍

Universal Media Compatible

Works across hydroponics, soil, coco, rockwool, and all soilless systems

🏆

40+ Years Proven

Industry-standard 3-part system trusted since 1976 by professionals worldwide

What's Included

1x bottle of FloraGro (size varies by selection)

Specifications

Specification	Value
Total Nitrogen (N)	2.0%
Ammoniacal Nitrogen	0.25%
Nitrate Nitrogen	1.75%
Available Phosphate (P₂O₅)	1.0%
Soluble Potash (K₂O)	6.0%
Magnesium (Mg)	0.5%
Derived From	Ammonium Phosphate, Magnesium Carbonate, Magnesium Nitrate, Magnesium Sulfate, Potassium Carbonate, Potassium Nitrate, Potassium Phosphate, Potassium Sulfate
Available Sizes	1 Gallon, 2.5 Gallon, 6 Gallon
Compatible Crops	Hemp, Cannabis, Vegetables, Herbs, Fruits, Flowers, All High-Value Crops
Compatible Media	Hydroponics, Rockwool, Coco, Peat-lite Mix, Potting Mix, In-ground Soil, Water Culture

Support & Manuals

📄FloraSeries Feed Chart (10-Part System)📄FloraSeries Feed Chart (6-Part System)📄FloraSeries Feed Chart (3-Part System)📄Product Label

FAQ

Can I use FloraGro by itself without FloraBloom and FloraMicro?+

No, FloraGro is designed as one component of the complete FloraSeries 3-part system. It provides nitrogen, potassium, phosphorus, and magnesium but lacks calcium and essential micronutrients. You must use it in combination with FloraMicro (calcium and micronutrients) and FloraBloom (additional phosphorus and potassium) in the ratios specified in the feed charts to deliver balanced, complete nutrition throughout the plant lifecycle.

How do I adjust FloraGro ratios as plants mature?+

Start seedlings with lower FloraGro ratios (gentle feeding), increase FloraGro during aggressive vegetative growth (maximum nitrogen for structure building), then reduce FloraGro as plants transition to flowering while increasing FloraBloom. The feed charts provide specific ml-per-gallon ratios for each growth stage. This adjustability is FloraSeries' key advantage—you're not locked into fixed ratios that can't adapt to plant development or strain-specific needs.

Why is FloraGro's nitrogen content relatively low at 2%?+

The 2% nitrogen is intentionally moderate to prevent excessive stretch and weak growth when combined with FloraMicro (which also contains nitrogen). By splitting nitrogen between FloraGro and FloraMicro, you get precise control over total nitrogen levels by adjusting FloraGro ratios while maintaining baseline nitrogen from FloraMicro. This prevents the excessive vegetative growth and nutrient burn common with high-nitrogen single-bottle formulas.

Do I still need FloraGro during the flowering phase?+

Yes, but in reduced amounts. Early flowering (weeks 1-2) still needs moderate FloraGro to support the flowering stretch. Mid-flowering reduces FloraGro while increasing FloraBloom as flower development accelerates. Late flowering minimizes FloraGro to trigger natural senescence while maximizing FloraBloom. The feed charts show how to gradually reduce FloraGro throughout flowering—eliminating it completely would create nitrogen deficiency and reduce yields.

What's the benefit of FloraSeries over simpler one-part nutrients?+

FloraSeries provides customization impossible with fixed one-part formulas. You can adjust N-P-K ratios for specific cultivars, growth stages, or environmental conditions. Heavy feeders get more aggressive ratios, sensitive strains get gentler feeding, and you can fine-tune based on plant response. One-part nutrients force every plant to accept the same fixed ratio. FloraSeries adapts nutrition to your plants rather than forcing plants to adapt to rigid formulas.

Can I use FloraGro with nutrients from other brands?+

While technically possible, mixing brands isn't recommended. FloraSeries is formulated as a complete system with each part balanced to work together in specific ratios. Substituting FloraBloom or FloraMicro with other brands creates unpredictable nutrient imbalances and potential compatibility issues. If you want to use FloraGro, commit to the complete FloraSeries system for the consistent, predictable results that have made it the industry standard for over 40 years.

How does the 6% potassium in FloraGro benefit vegetative growth?+

Potassium regulates stomatal function (controlling water and CO2 exchange), activates enzymes essential for photosynthesis and protein synthesis, and strengthens cell walls for sturdy stems. The 6% potassium in FloraGro ensures vegetative plants develop strong structural support while maintaining efficient nutrient and water transport. This prevents the weak, floppy growth common with nitrogen-only vegetative formulas and builds the foundation for heavy flowering later.

Should I buy all three FloraSeries bottles in the same size?+

Not necessarily. Usage rates vary by growth phase—during vegetative growth you'll use more FloraGro and FloraMicro, while during flowering you'll consume more FloraBloom and FloraMicro. Some growers buy larger bottles of FloraMicro (used throughout the lifecycle) and adjust FloraGro/FloraBloom sizes based on their grow schedule. However, buying matching sizes initially is safest until you understand your specific consumption patterns across complete grow cycles.

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General Hydroponics FloraGro Nutrients