Fox Farm Big Bloom delivers immediate nutrients through earthworm castings and bat guano in an ultra-low 0-0.5-0.7 NPK formula that won’t burn plants. This OMRI-listed organic liquid fertilizer comes in seven sizes from 1 pint to 250 gallons, making it practical for both small greenhouse operations and large-scale landscape contractors.
The zero nitrogen content sets Big Bloom apart from typical fertilizers. Contractors can apply it to drought-stressed plants, fresh transplants, or delicate seedlings without risk of chemical burn. For Montana’s short growing season, the flexible dilution rates let landscapers adjust feeding strength based on plant vigor and weather conditions.
Application Rates and Professional Use
Big Bloom’s concentrated formula requires specific dilution rates: general feeding at 4 tablespoons per gallon every other watering, heavy feeding at 1/2 cup per gallon weekly, foliar application at 1 tablespoon per gallon weekly, and seedling/transplant rate at 1 tablespoon per gallon every other watering. These measured rates eliminate guesswork for crews handling multiple properties.
The concentrate mixes with other Fox Farm liquid fertilizers in the same reservoir, streamlining application for contractors using complete feeding programs. The liquid formulation supplies nutrients that plants access immediately, critical when Montana’s frost-free window demands rapid establishment.
| Application Type | Dilution Rate | Frequency |
|---|---|---|
| General Feeding | 4 Tbsp/gallon | Every other watering |
| Heavy Feeding | 1/2 cup/gallon | Weekly |
| Foliar Spray | 1 Tbsp/gallon | Weekly |
| Seedlings | 1 Tbsp/gallon | Every other watering |
Size Options and Commercial Efficiency
The seven size options scale from homeowner-friendly pints to commercial 55-gallon drums and 250-gallon totes. Professional landscapers working organic-certified properties need bulk options that reduce per-application costs while maintaining OMRI compliance.
The organic certification opens doors to municipal contracts and organic farm installations where synthetic fertilizers violate project specifications. CDFA Organic Input Material registration adds California-level compliance for contractors working multi-state projects.
The concentrated formula reduces storage footprint compared to ready-to-use products. One gallon of concentrate yields 32-128 gallons of working solution depending on application strength. For contractors juggling limited warehouse space, that efficiency matters.
Organic Certification and Market Access
Big Bloom has OMRI Listed certification and CDFA Organic Input Material registration. These certifications aren’t just paperwork. They unlock contract opportunities at organic farms, school districts with organic maintenance policies, and residential communities prioritizing chemical-free landscaping.
The earthworm casting and bat guano base provides centuries-proven fertility without synthetic salts. The microbial activity supports long-term soil vitality, reducing the need for soil amendments on maintained properties.
Some users report recent batches running “thin as water” compared to previous consistency. The thinner formula still delivers the guaranteed analysis but may require adjustment to spray equipment calibration.
Professional Verdict
Big Bloom fills a specific niche — gentle organic feeding for sensitive plants and certified-organic properties. The zero nitrogen formula prevents burning while the 0.5% phosphorus supports root development and 0.7% potassium maintains overall plant health. For Montana contractors managing mixed plantings where aggressive fertilizers damage established perennials, Big Bloom provides insurance against customer callbacks.
The product shines in professional greenhouse operations starting vegetable transplants for Montana’s compressed growing season. The 1 tablespoon per gallon seedling rate won’t shock young plants during the critical hardening-off period before field planting.
At seven size options including contractor-friendly 55-gallon drums, Fox Farm built this product for professional use. The premium pricing reflects the organic certification and specialized ingredients. For contractors who need a burn-proof organic option that works across all growth stages, Big Bloom delivers exactly what the label promises.
Frequently Asked Questions
Q: What’s the NPK ratio of Fox Farm Big Bloom and why is nitrogen zero?
Fox Farm Big Bloom has an ultra-low 0-0.5-0.7 NPK ratio with zero nitrogen content, making it safe for drought-stressed plants and fresh transplants that would burn with traditional fertilizers. The formula focuses on earthworm castings and bat guano for gentle nutrient delivery without the risk of chemical burn.
Q: How much Fox Farm Big Bloom concentrate do I mix per gallon?
Fox Farm Big Bloom requires 4 tablespoons per gallon for general feeding every other watering, or 1/2 cup per gallon for heavy feeding once weekly. Seedlings and transplants need only 1 tablespoon per gallon every other watering to avoid shocking young plants.
Q: What size options does Fox Farm Big Bloom come in?
Fox Farm Big Bloom is available in seven sizes: 1 pint, 1 quart, 1 gallon, 2.5 gallons, 5 gallons, 55 gallons, and 250 gallons. The larger commercial sizes like 55-gallon drums make it practical for landscape contractors managing multiple properties.
Q: Is Fox Farm Big Bloom certified organic?
Yes, Fox Farm Big Bloom has OMRI Listed certification and CDFA Organic Input Material registration. These certifications allow contractors to use it on organic farms, school districts with organic maintenance policies, and residential properties requiring chemical-free landscaping.
Q: Can I mix Fox Farm Big Bloom with other Fox Farm fertilizers?
Fox Farm Big Bloom can be mixed in the same reservoir with other Fox Farm liquid fertilizers like Grow Big and Tiger Bloom for a complete feeding schedule. This compatibility allows contractors to create custom nutrient programs without switching between multiple tanks.
Q: What ingredients make Fox Farm Big Bloom different from synthetic fertilizers?
Fox Farm Big Bloom contains earthworm castings, bat guano, and kelp as primary ingredients instead of synthetic salts. This micro-brewed organic formula provides immediate nutrient availability while supporting beneficial microbial activity in the soil.
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