Mad Farmer Mother Of All Blooms

Mad Farmer M.O.A.B. (Mother of All Blooms) is a high-concentration dry soluble bloom booster with a 0-52-32 NPK. It delivers extreme levels of phosphorus and potassium to flowering plants during two critical windows: the first week of bloom to trigger flower sites, and the final 2–3 weeks of flowering as a finisher. M.O.A.B. also contains reagent-grade Thiamine (Vitamin B-1), which supports abiotic stress tolerance and redirects plant energy toward essential oil production. Because the formula is so concentrated, base nutrient rates must be reduced by up to 50% when M.O.A.B. is in use.

M.O.A.B. Specifications

M.O.A.B. is a dry soluble powder, meaning it dissolves completely in water with no residue. The unusually high phosphorus content (52%) makes it one of the most concentrated PK bloom supplements available in powder form. It is sold in sizes ranging from 100g for home growers up to 500 lb for large commercial operations.

Specification	Value
NPK Analysis	0-52-32
Form	Dry soluble powder
Dose Rate	1–2 teaspoons per 5 gallons (~1 ml/gal equivalent)
Application Window	Week 1 of bloom; final 2–3 weeks of flowering
Primary Ingredients	Mono Potassium Phosphate, Mono Ammonium Phosphate, Thiamine HCl (B-1)
Available Sizes	100g, 250g, 500g, 1kg, 2.27kg, 10 lb, 25 lb, 100 lb, 300 lb, 500 lb
Brand	Mad Farmer (Hydrofarm ecosystem)
Supplier SKU	11365 – Base
Base Nutrient Adjustment	Reduce base nutrients by up to 50% when using M.O.A.B.

Why Choose M.O.A.B.

There are several concentrated PK bloom boosters on the market. M.O.A.B. is distinguished by a few specific formulation decisions that are worth understanding before purchase.

• 52% available phosphoric acid (P2O5). Phosphorus at this concentration is unusually high for a commercial bloom supplement. Most PK boosters in the same category run between 10% and 40% phosphorus. The 52% figure means a small amount of powder delivers significant P loading per feeding, which is why the dose rate is measured in teaspoons per 5 gallons rather than ml per liter. Growers who have historically relied on low-concentration liquid boosters will notice the dose rate is dramatically smaller.
• Reagent-grade Thiamine Hydrochloride (Vitamin B-1). M.O.A.B. includes pharmaceutical-grade B-1, not agricultural-grade. Thiamine helps plants manage abiotic stress — including the stress of transitioning from vegetative to reproductive growth, transplanting, or environmental fluctuations. Under stress conditions, a plant’s metabolic energy is diverted to stress response rather than flower production. B-1 supplementation is used to attenuate that diversion and keep energy directed toward essential oil production and floral mass development.
• Dual-window application strategy. Unlike many bloom boosters that are designed only as finishers (added in the final weeks), M.O.A.B. is specifically formulated for two separate windows: bloom initiation (week 1) and bloom completion (final 2–3 weeks). Using it at both windows supports flower site activation early in the cycle, then drives final weight and essential oil density during the finish. Not all growers use it at both windows — some use it only at the end — but the formulation supports both strategies.
• Dry powder format for concentration and shelf stability. Powders carry more active ingredient per unit weight than liquid concentrates, which are typically 70–90% water. A 100g bag of M.O.A.B. stores longer than an equivalent liquid product, ships lighter, and does not pose a spill risk during storage or transport. For commercial growers purchasing in bulk (10 lb, 25 lb, or larger), the powder format also simplifies bulk dispensing via weighing rather than volumetric measurement.
• Scalable from small gardens to commercial operations. The 100g and 250g sizes serve home growers and small tent setups, while the 10 lb through 500 lb options cover commercial facilities that need consistent supply of the same product without formulation changes. This means a grower who develops a protocol on the small sizes can scale it directly without product switching.

Best Uses for M.O.A.B.

M.O.A.B. is a bloom-stage-only supplement. It is not a base nutrient and is not appropriate for vegetative growth, as its 0-52-32 NPK provides no nitrogen. The following scenarios describe where the product is best suited.

• Bloom initiation in photoperiod or auto-flowering plants. Adding M.O.A.B. during the first week of the flowering period gives plants a concentrated phosphorus signal that coincides with the natural hormonal shift toward reproduction. This supports early and uniform flower site development across the canopy. Reduce base nutrients by 50% during this application to prevent nutrient overload.
• High-PK finish in the final 2–3 weeks of flowering. During late flowering, plants mobilize phosphorus and potassium at high rates to support seed development (or, in sinsemilla production, to maximize essential oil density and floral mass). M.O.A.B. at the finisher application delivers concentrated P and K at exactly this window. Growers who use a flush or ripening phase can use M.O.A.B. as the last nutrient addition before the flush begins.
• Hydroponic reservoirs (DWC, ebb-and-flow, NFT, drip). M.O.A.B. dissolves fully in water with no particulate residue, making it compatible with reservoir-based systems without clogging emitters or spray heads. Dissolve the powder in a small amount of warm water first, then add to the full reservoir volume while stirring. Always check EC after adding M.O.A.B., as the high phosphorus content contributes significantly to total dissolved solids.
• Soil and coco coir grows seeking a P/K push. M.O.A.B. works in any growing medium. In soil, the phosphorus is taken up as soluble orthophosphate, which is the same form plants use regardless of medium. In coco coir, which is inherently low in phosphorus and potassium, M.O.A.B. can be a practical way to deliver high-dose P/K without dramatically increasing the volume of liquid added per feeding.
• Growers layering supplements on top of a base nutrient program. M.O.A.B. is a supplement, not a replacement for a complete base nutrient. It should be added on top of a base program (such as Advanced Nutrients pH Perfect Sensi Bloom) during the specified windows, with base nutrient rates reduced to compensate for the additional P/K load. Using M.O.A.B. without reducing base nutrients risks phosphorus and potassium toxicity symptoms.
• Commercial operations with well-defined feed schedules. Because M.O.A.B. is applied only at two specific windows, it integrates cleanly into a commercial feed schedule. It does not require daily or weekly application across the entire flowering period, which makes it straightforward to incorporate into automated or timer-controlled feeding programs.

M.O.A.B. vs Flower Fuel

Flower Fuel (1-34-32) is the most commonly compared competitor to M.O.A.B. Both are dry soluble bloom boosters applied at low dose rates during the flowering period. The differences are meaningful enough to affect which product makes more sense depending on a grower’s specific priorities.

Phosphorus content: M.O.A.B. carries 52% available phosphoric acid (P2O5) versus Flower Fuel’s 34%. For growers who specifically want maximum phosphorus delivery per gram of product, M.O.A.B. provides a meaningfully higher P loading at the same dose rate. If phosphorus saturation during bloom is the primary goal, M.O.A.B. has a clear advantage on this metric.

Ingredient complexity: Flower Fuel markets itself as containing 40+ ingredients including amino acids, chelated micronutrients, humic acid, and various organic stimulants. M.O.A.B.’s formulation is deliberately simple: Mono Potassium Phosphate, Mono Ammonium Phosphate, and reagent-grade Thiamine HCl. Growers who already use a comprehensive base nutrient stack with organic amendments may find Flower Fuel’s additional ingredients redundant. Growers who want a clean, high-purity PK supplement without complex additives may prefer M.O.A.B.’s straightforward formulation.

Vitamin B-1: M.O.A.B. includes reagent-grade Thiamine Hydrochloride specifically to address abiotic stress during the bloom transition. Flower Fuel does not prominently feature B-1. For growers who find that plants show stress symptoms during the transition to flowering (leaf curl, nutrient uptake issues, slow flowering initiation), M.O.A.B.’s B-1 content provides a functional benefit Flower Fuel does not specifically address.

Potassium parity: Both products carry 32% potassium (K2O), so there is no differentiation on the K side. The primary formulation difference is on phosphorus, the ingredient stack beyond PK, and the presence of B-1 in M.O.A.B.

When Flower Fuel might be preferred: Growers who want a single bloom booster that also supplies trace minerals, amino acids, and organic stimulants as a complete one-product addition may find Flower Fuel’s broader ingredient list useful, particularly if their base nutrient program is minimal. Growers with access to supplemental organic amendments and who simply need concentrated PK will likely find M.O.A.B. more economical on a per-gram-of-P basis.

Compatibility & Operating Range

M.O.A.B. is compatible with soil, coco coir, rockwool, perlite, clay pebbles (LECA), and all standard hydroponic systems including DWC, ebb-and-flow, NFT, drip, and aeroponics. It dissolves completely and does not leave particulate residue, so it will not clog drip emitters or spray heads when properly pre-dissolved.

pH operating range: After dissolving M.O.A.B. and all other nutrients, target a final pH of 5.5–6.2 for hydroponic systems and 6.0–6.8 for soil or coco coir. Adding M.O.A.B. to water will lower pH noticeably due to the phosphoric acid content, so check and adjust pH after mixing. Do not assume pH is stable after addition; always verify with a calibrated meter.

EC / TDS impact: M.O.A.B. has a significant EC contribution at the recommended dose rate due to its high concentration of dissolved salts. Always check EC with a calibrated meter after adding M.O.A.B. to your nutrient solution, and before the 50% base nutrient reduction, so you can dial in the combined EC accurately. Target EC will depend on your specific crop, growth stage, and water quality. Monitor plant response for signs of over-fertilization (tip burn, leaf curl, dark green coloration) and adjust dose accordingly.

Base nutrient interaction: Because M.O.A.B.’s phosphorus load is extreme relative to standard feeding programs, base nutrient rates must be cut by up to 50% during M.O.A.B. application windows. Failure to reduce base nutrients increases the risk of phosphorus toxicity and nutrient lockout, as high phosphorus can interfere with iron, zinc, and copper uptake at the root level.

Compatible supplements: M.O.A.B. is designed to work alongside the broader Mad Farmer product lineup. It is not known to precipitate when combined with standard pH adjusters, silica supplements, or beneficial microorganism products when each additive is added separately to already-diluted water. Avoid mixing M.O.A.B. powder directly with concentrated liquid nutrients before dilution. Always dissolve M.O.A.B. in a small amount of water first, then add to your reservoir or mixing container separately from other concentrated nutrient solutions.

Not suitable for: Vegetative-only feeding programs (the 0-52-32 NPK has no nitrogen), or foliar spray applications. M.O.A.B. is a root-zone supplement only.

Dosing Guidelines

M.O.A.B. is applied at two distinct windows in the flowering cycle, not continuously throughout bloom. The following guidelines reflect Mad Farmer’s published application protocol.

Application Window	Dose Rate	Base Nutrient Adjustment
Bloom initiation (week 1 of flower)	1–2 tsp per 5 gallons	Reduce base nutrients by up to 50%
Bloom finisher (final 2–3 weeks)	1–2 tsp per 5 gallons	Reduce base nutrients by up to 50%
Mid-bloom (weeks 2 through penultimate)	Not typically applied	Resume standard base rates

Notes on applying the dosing protocol:

• Start at 1 tsp per 5 gallons when using M.O.A.B. for the first time or with an untested strain. The higher 2 tsp rate can be introduced once you have confirmed the strain responds well to the lower dose without showing tip burn or other over-fertilization symptoms.
• The 50% base nutrient reduction is not optional. At 52% phosphorus, M.O.A.B. adds P/K loading that, combined with a full-rate base nutrient program, will push total EC and nutrient ion concentrations well above plant tolerance in most cases. Treat the reduction as part of the protocol, not a suggestion.
• Pre-dissolve in warm water. M.O.A.B. is a dry powder. Dissolve it in 0.5–1 liter of warm (not hot) water before adding to your reservoir or feeding water. This ensures even distribution and prevents localized high-concentration zones in the reservoir that could affect plant roots.
• Apply on the same feeding schedule as your base nutrients. M.O.A.B. does not require a separate feeding event. Add it to the same watering that contains your base nutrients (at their reduced rate) on whatever schedule your current program uses.
• Monitor runoff or reservoir EC closely during M.O.A.B. windows. Because of the elevated P and K contribution, salt accumulation can be faster during M.O.A.B. application periods. In soil and coco, check runoff EC at least every other watering. In hydroponic reservoirs, test EC before each top-off. If EC is climbing above your target, flush or reduce dose.
• One 100g bag covers approximately 75–150 gallons of nutrient solution at the 1 tsp/5 gal rate (a 100g bag contains roughly 30–50 teaspoons depending on powder density and packing). For a 5×5 tent running two M.O.A.B. windows across a 10-week flower cycle, the 250g or 500g sizes are typically more appropriate than the 100g.

How to Set Up M.O.A.B.

The following steps apply to any growing medium. “Feeding water” refers to either the reservoir in a hydroponic system or the irrigation batch being prepared for a watering event in soil or coco.

1. Confirm your plants are in the correct stage. M.O.A.B. is applied only at bloom initiation (week 1 of the 12/12 light cycle or equivalent for autos) or during the final 2–3 weeks of the flowering period. Do not apply during vegetative growth or during mid-bloom. Check your calendar against the strain’s published flowering time to identify the correct application windows before mixing.
2. Gather equipment. You will need an accurate kitchen scale or calibrated teaspoon measure, a mixing container, a pH meter, an EC/TDS meter, pH adjustment solution (pH up/down), and a stirring implement. Do not estimate the dose by eye — M.O.A.B. is concentrated enough that small measurement errors can cause meaningful over- or under-dosing.
3. Prepare your base nutrient solution first at 50% of normal rate. Mix your base nutrients into your feeding water at half the volume you would typically use (e.g., if your normal bloom rate is 10 ml/gal for Part A and Part B combined, use 5 ml/gal). This step establishes the starting EC from which M.O.A.B. will be added.
4. Pre-dissolve M.O.A.B. powder. Weigh or measure 1 tsp of M.O.A.B. powder per 5 gallons of total feeding volume. Add the powder to 0.5–1 liter of warm water in a separate container and stir until fully dissolved. The solution should be clear or very lightly tinted. Do not add the dry powder directly to a full reservoir or to a container already holding concentrated nutrient solution.
5. Add the dissolved M.O.A.B. to your feeding water. Pour the pre-dissolved M.O.A.B. solution into the feeding water or reservoir while stirring. Mix thoroughly for 30–60 seconds to ensure even distribution.
6. Add any remaining compatible supplements. If using silica, beneficial microorganism products, or enzyme supplements, add them now following their individual dose rates. Add each supplement separately, mixing between additions, to minimize the risk of precipitation or interaction.
7. Check and adjust pH. The high phosphorus content of M.O.A.B. will lower pH. After all additions, test pH with a calibrated meter. Adjust to your target range: 5.5–6.2 for hydroponic systems, 6.0–6.8 for soil or coco. Add pH adjustment in small increments, stirring and retesting between additions.
8. Verify EC. Measure EC with a calibrated meter. Compare to your expected range for the growth stage. If EC is higher than target, dilute with additional plain water and recheck. If EC is lower than expected, verify that M.O.A.B. was fully dissolved and evenly distributed before assuming the dose is too low.
9. Feed plants promptly. Deliver the prepared nutrient solution within a few hours of mixing, particularly in hydroponic systems where aerated water can cause pH drift. Do not store prepared M.O.A.B. solution for more than 24 hours.
10. Observe plant response over the following 24–72 hours. After the first M.O.A.B. application, check leaves for signs of nutrient stress: tip burn (excess EC), dark green or claw-curled leaves (excess nitrogen or potassium), or yellowing (pH lockout). Adjust dose or pH on the next feeding based on what you observe rather than maintaining the same protocol regardless of plant feedback. Link the Sun Blaze T5 HO lighting setup and canopy environment checks to this observation window to rule out environmental causes of any stress symptoms.
11. Repeat at the finisher window. If you used M.O.A.B. at bloom initiation, repeat the protocol during the final 2–3 weeks of flowering. Reduce base nutrients again by 50% during this window. After the M.O.A.B. finisher window is complete, transition to your standard flush or water-only protocol according to your program. See the CVault storage container page for post-harvest drying and curing environment tips.

Sources & Further Reading