Humboldt County’s Own Sonic Bloom – 5 lb

Humboldt County’s Own Sonic Bloom is a dry powdered PK bloom booster with an NPK of 0-51-34, nicknamed “Sunshine Powder” for its bright performance in the flowering phase. Based on pharmaceutical-grade potassium phosphate (KH&sub2;PO&sub4;), it delivers one of the highest phosphorus and potassium concentrations available in a water-soluble powder format while adding a proprietary vitamin B complex — including 20× the vitamin B1 of competing bloom boosters, plus B2, B3, and B6 — that most pure PK boosters lack entirely. Applied at just 1 teaspoon per 5 gallons, Sonic Bloom works with any nutrient brand and any grow medium, from week 2 of bloom through one week before harvest.

Sonic Bloom Specifications

The specifications below are drawn from the Humboldt County’s Own official product page, brand site, supplier data from shophydrocity.com, and retailer listings at monstergardens.com. All values are grounded in published product data.

Specification	Value
Brand	Humboldt County’s Own
Product name	Sonic Bloom (“Sunshine Powder”)
NPK ratio	0-51-34
Available Phosphate (P₂O₅)	51%
Soluble Potash (K₂O)	34%
Primary ingredient	Potassium phosphate (KH₂PO₄) — highest quality source available per brand
Vitamin B1 (Thiamine)	20× the concentration of competing bloom boosters
Additional vitamins	B2 (Riboflavin), B3 (Niacin), B6 (Pyridoxine)
Product form	Dry water-soluble powder
Dyes	None — contains no artificial dyes
Net weight (this size)	5 lb (2.27 kg)
Shipping weight	11.0 lb
UPC (5 lb)	892753002574
Application rate	1 teaspoon per 5 gallons of water
Application window	Week 2 of bloom through 1 week before harvest
Growing system compatibility	Soil and hydroponic — all nutrient brands
Restriction	Use Sonic Bloom OR Crystal Burst — not both simultaneously
Companion products	Humboldt County’s Own G10 & Killer Tea (“gravity effect” stack)
Available sizes	100 g, 454 g (1 lb), 2.27 kg (5 lb), 4.54 kg (10 lb), 11.34 kg (25 lb), 22.68 kg (50 lb)
Origin	Hand crafted in Northern California

Why Choose Sonic Bloom

The points below are drawn from the Humboldt County’s Own official product page, brand homepage, supplier canonical description, and research data from monstergardens.com. Each claim is grounded in published product data.

• An ultra-concentrated PK profile (0-51-34) derived from the highest quality KH₂PO₄ source. Humboldt County’s Own markets Sonic Bloom as the “Most Concentrated PK Booster on the market.” The 51% available phosphate and 34% soluble potash come from potassium phosphate (KH₂PO₄) sourced at pharmaceutical quality. Because the powder is nearly pure KH₂PO₄, growers get maximum PK delivery per gram of product. Unlike some PK boosters that use lower-purity salts or blends that dilute the active concentration, the formulation stays lean — no fillers, no dyes, no artificial colorants. The result is a product where almost every gram dissolved in the reservoir is contributing P and K directly to the plant.
• A proprietary vitamin B complex that places Sonic Bloom in its own category among PK boosters. Most PK bloom boosters stop at phosphorus and potassium. Sonic Bloom adds 20 times the vitamin B1 (thiamine) found in other popular bloom boosters, plus significant concentrations of B2 (riboflavin), B3 (niacin), and B6 (pyridoxine). Thiamine (B1) is involved in carbohydrate metabolism and is associated with root zone activity and stress recovery. B2, B3, and B6 play roles in enzyme function and cellular energy pathways. While pure PK products like raw MKP provide the phosphorus and potassium profile, they carry none of this vitamin loading. The vitamin stack is the primary reason Humboldt County’s Own describes Sonic Bloom as “in its own class.”
• Extreme economy of dose at 1 teaspoon per 5 gallons. At this application rate, the 5 lb bag represents a significant number of reservoir fills before it needs replacing. The powder format also means there is no liquid volume adding shipping weight to the nutrient content itself — you are buying concentrated active ingredients, not water. Growers running large recirculating systems or multiple reservoirs will find the 5 lb and larger sizes (up to 50 lb) meaningfully cost-efficient on a per-gallon-of-reservoir basis compared to liquid PK boosters at equivalent PK concentrations.
• Universal compatibility — works with every nutrient brand and grow system. Sonic Bloom is formulated to be added to any existing feeding program. It does not require switching base nutrient brands, adopting a Humboldt-specific program, or reformulating your existing schedule around it. Soil growers and hydroponic growers both use it. The powder dissolves readily in water and can be incorporated into reservoir top-offs, drip system reservoirs, or watering cans. The only constraint published by the brand is that Sonic Bloom and Crystal Burst should not be used together — choose one or the other for the bloom phase.
• Independently tested, produced under FDA Food Quality standards in Northern California. Humboldt County’s Own bottles products using FDA Food Quality Stainless Steel bottling systems and subjects formulations to independent lab testing. The brand has been operating for over 20 years in Northern California, a region with a strong tradition of cannabis and specialty crop cultivation. This production background supports consistency across batches, which matters for growers who rely on predictable feeding schedules where concentration variation would disrupt dialed-in EC targets.

Best Uses for Sonic Bloom

The use cases below are derived from the application window, NPK profile, vitamin content, and growing system compatibility data published by Humboldt County’s Own and confirmed through supplier and retailer listings.

• Bloom-phase PK supplementation for any nutrient program from week 2 through late flowering. Sonic Bloom is designed to be layered on top of a base nutrient program starting at the beginning of visible flower development and continued through the week before harvest. This covers the entire peak phosphorus and potassium demand window for most flowering crops. Growers running any base nutrient — from General Hydroponics to Athena, Canna to Fox Farm — can add Sonic Bloom to their existing schedule without reformulating their base program.
• Increasing flower size and mass during the bulk-building phase. The canonical description states that Sonic Bloom increases the size and mass of flowers. The high phosphorus content supports energy transfer and flower development; the potassium supports cell turgor, sugar production, and the translocation of photosynthates from leaves to developing flowers. This combination targets the mid-bloom period when the plant is actively bulking floral structure before final ripening.
• Stimulating resinous oil and fragrance production in culinary and medicinal herbs. Per the brand’s description, Sonic Bloom stimulates resinous oil and fragrance production in many culinary and medicinal herbs. The combination of PK loading and B-vitamin support during the flowering stage is described by the brand as driving the metabolic activity behind terpene and essential oil production. This makes Sonic Bloom particularly relevant for growers of high-resin crops where fragrance and oil content are quality metrics.
• Running the “gravity effect” stack with Humboldt County’s Own G10 and Killer Tea. Humboldt County’s Own specifically recommends using Sonic Bloom alongside G10 and Killer Tea to produce what they call the “gravity effect” — a term they use for the stack’s combined impact on flower weight and density. Growers who want to explore the full Humboldt County’s Own bloom protocol will start here with Sonic Bloom as the PK backbone and layer in G10 and Killer Tea for the complete effect.
• Indoor grow rooms and tents under high-output supplemental lighting. Sonic Bloom’s concentrated PK delivery is well suited to high-intensity indoor environments where light-driven photosynthesis creates strong demand for phosphorus and potassium during flowering. In a well-managed grow tent like the Grow Shop Outlet 48×48×78 Grow Tent, where temperature, humidity, and light are controlled, the plant’s nutrient demand during peak flowering is highly predictable and Sonic Bloom’s measured dose rate supports precise feeding management.
• Growers who want dry nutrients for longer shelf life and storage convenience. The powder format has a substantially longer shelf life than liquid bloom boosters and does not risk leakage or spillage in storage. A 5 lb bag takes up minimal shelf space and holds enough product for dozens of reservoir fills. Growers with limited storage space or those buying in bulk for multiple grow cycles will find the powder format practically easier to manage than an equivalent volume of liquid PK concentrate.

Sonic Bloom vs MOAB by Mad Farmer

The two most directly comparable ultra-concentrated dry PK bloom boosters in the specialty grow market are Humboldt County’s Own Sonic Bloom (0-51-34) and MOAB (Mother Of All Blooms) by Mad Farmer (0-52-32). Both are dry water-soluble powders used as standalone bloom-phase PK supplements. Both are marketed to serious indoor growers seeking the maximum PK concentration in a single additive. The differences are in nutrient profile and vitamin content.

Sonic Bloom (0-51-34, this product): The phosphorus content (51% available phosphate) is slightly lower than MOAB, while the potassium content (34% soluble potash) is slightly higher. The most meaningful differentiator is the vitamin B complex: Sonic Bloom contains 20 times the vitamin B1 of other competing bloom boosters, plus significant B2, B3, and B6. This vitamin stack is entirely absent from MOAB. Humboldt County’s Own sources their potassium phosphate at what they describe as pharmaceutical quality and produces the product using FDA Food Quality Stainless Steel systems with independent lab testing. The brand also publishes a clear companion product protocol (G10 + Killer Tea for the gravity effect) and a specific timing restriction (Sonic Bloom OR Crystal Burst, not both). Sonic Bloom is produced in Northern California by a brand with 20+ years in the specialty crop market.

MOAB by Mad Farmer (0-52-32, comparator): MOAB carries a marginally higher phosphorus value (52% vs 51%) and slightly lower potassium (32% vs 34%). It is also a dry powder used at the bloom phase. MOAB does not include a vitamin B complex — it is a pure PK product with no published thiamine, riboflavin, niacin, or pyridoxine content. Mad Farmer’s MOAB is similarly marketed as a high-intensity bloom additive for experienced growers and is widely available in the specialty grow retail channel. Its simplicity (pure PK, no vitamin additions) may appeal to growers who prefer a single-purpose product and want to manage their vitamin B inputs separately.

Key trade-offs:

• Sonic Bloom’s vitamin B1/B2/B3/B6 complex is the primary differentiator: MOAB has no equivalent vitamin content. Growers who want PK and B-vitamin support in a single product have only Sonic Bloom of the two.
• MOAB has a marginally higher phosphorus value (52% vs 51%); Sonic Bloom has marginally higher potassium (34% vs 32%). In practical terms at 1 tsp/5 gal dose rates, this difference is negligible for most crops.
• Both are dry powders, both dissolve readily in water, and both work with any nutrient brand. Neither product requires a brand-specific base nutrient program.
• Sonic Bloom has a published timing restriction (not with Crystal Burst); MOAB does not have an equivalent published restriction.
• At comparable dose rates, cost-per-gallon will depend on current pricing for each product size. Both are available in bulk sizes for commercial production.
• Growers who want a validated companion product stack (G10 + Killer Tea + Sonic Bloom for the gravity effect) have a clear Humboldt County’s Own protocol to follow. MOAB does not have an equivalent brand-published companion stack.

For growers whose primary need is the highest possible PK concentration in a clean dry powder without any additional ingredients, MOAB and Sonic Bloom are functionally comparable. For growers who want the PK profile plus a vitamin B complex in the same product, Sonic Bloom is the choice. For growers pairing their PK booster with a complete advanced bloom nutrient like Advanced Nutrients pH Perfect Sensi Bloom Part A, either product can be layered on top as a PK supplement.

Compatibility & Operating Range

The compatibility information below is drawn from the Humboldt County’s Own official product page, the canonical supplier description, and standard practice for dry PK bloom boosters in hydroponic and soil production systems.

Growing system compatibility: Sonic Bloom is confirmed compatible with both soil and hydroponic growing systems. The dry powder dissolves fully in water and can be added directly to reservoir solutions, hand-watering mixes, or drip-irrigation nutrient tanks. The product does not require a specific system type: it works in deep water culture (DWC), recirculating drip, nutrient film technique (NFT), flood and drain (ebb and flow), aeroponics, and hand-watered soil or coco coir containers. At 1 teaspoon per 5 gallons, the dilution rate produces a solution suitable for delivery through standard drip emitters and tubing without clogging risk.

Nutrient brand compatibility: Works with all nutrient brands. Sonic Bloom is not a proprietary product tied to the Humboldt County’s Own base nutrient line — it is explicitly positioned as a brand-agnostic PK supplement. Growers running General Hydroponics, Canna, Advanced Nutrients, Athena, Botanicare, or any other base nutrient program can incorporate Sonic Bloom without reformulating the rest of their feeding schedule.

Critical restriction — Sonic Bloom OR Crystal Burst: The brand explicitly states that Sonic Bloom and Crystal Burst (another Humboldt County’s Own bloom booster) should not be used together. Both products serve as concentrated PK supplements during the bloom phase; combining them would result in excessive phosphorus and potassium loading. Choose one or the other for a given crop cycle. If transitioning between products across crop cycles, fully flush the reservoir between cycles before introducing the new product.

Companion product compatibility — the “gravity effect” stack: Sonic Bloom is specifically designed to work alongside Humboldt County’s Own G10 (a growth and flowering stimulant) and Killer Tea (a compost tea-based microbial product) to produce the brand’s “gravity effect.” The three products used together form a bloom-phase stack that the brand has tested and recommends as a complete protocol. Growers interested in the gravity effect should follow the brand’s published dose rates for each product individually and verify that the combined EC contribution stays within the target range for their crop and growth stage.

pH range: Potassium phosphate (KH₂PO₄) is acidic when dissolved in water and will lower the pH of unbuffered water. After dissolving Sonic Bloom in your reservoir or mixing container, check solution pH and adjust to the target range: 5.8–6.2 for most hydroponic systems, 6.0–6.8 for soil. pH is especially important to verify after adding a concentrated phosphate source, as the acid contribution can be significant at high reservoir volumes or when using soft water with low buffering capacity. Always adjust pH after all nutrients and additives have been added.

Temperature and storage: Store dry powder in a sealed container in a cool, dry location away from direct sunlight and humidity. Unlike liquid nutrients, dry powder is not at risk of microbial contamination from moisture if stored properly. Once dissolved in a reservoir, the nutrient solution should be used within the normal feeding cycle timeframe — do not leave pre-mixed solutions containing Sonic Bloom in an open reservoir for extended periods in warm environments.

Indoor grow environment: Sonic Bloom’s effectiveness in the flowering phase is maximized in stable indoor environments where light, temperature, and humidity are controlled. A properly equipped grow space such as one set up with a high-output grow light (for example, the Eye Hortilux 600W Ceramic HPS Grow Light Bulb) driving strong photosynthesis during bloom creates the plant-side demand that Sonic Bloom’s concentrated PK loading is designed to meet.

Dosing Guidelines

The dosing information below is drawn from the Humboldt County’s Own official product page and supplier canonical description. The application rate (1 teaspoon per 5 gallons) and timing window (week 2 of bloom through 1 week before harvest) are confirmed by multiple retailer listings and the brand’s published product page.

Base application rate: 1 teaspoon per 5 gallons of water (approximately 1 tsp per 19 liters). This is a conservative starting point consistent with ultra-concentrated PK products where a small volume delivers significant nutrient loading. At an NPK of 0-51-34, even a small dose by weight translates to meaningful phosphorus and potassium additions to the reservoir.

Converting to metric and larger volumes:

• 1 tsp per 5 gal = approximately 1 g per 3.8 L
• 20-gallon reservoir: 4 teaspoons (or approximately 1 tablespoon + 1 teaspoon)
• 50-gallon reservoir: 10 teaspoons
• 100-gallon reservoir: 20 teaspoons (approximately 6.7 tablespoons or just under ½ cup)

Use a calibrated measuring spoon or digital gram scale for precision. Do not estimate by eye with a dry powder at these concentration levels — even modest over-application of a 0-51-34 product can push reservoir phosphorus and potassium above target levels and cause nutrient lockout.

Application timing: Begin when flower development first appears — typically around week 2 of the bloom cycle. Continue through the feeding schedule until 1 week before harvest. Do not apply during the final flush week. The precise start and end points depend on the crop’s total flowering duration; for crops with shorter flowering periods (6–7 weeks), starting at first sign of flower development and stopping one week before targeted harvest is the correct protocol. For longer-flowering varieties (9–12 weeks), the same start trigger applies but the application window extends accordingly.

Measuring and dissolving the powder: Sonic Bloom is a dry powder and dissolves readily in water. Measure the dose before adding to the reservoir. Add the powder to a small volume of reservoir-temperature water first and stir to dissolve, then add the pre-dissolved solution to the full reservoir. This pre-dissolving step ensures complete dissolution and prevents the powder from clumping against the bottom of a large reservoir before being distributed by the pump.

EC contribution: At 0-51-34 NPK, Sonic Bloom contributes primarily to the phosphorus and potassium fractions of the total EC reading. Measure reservoir EC before adding Sonic Bloom and again after mixing to quantify the additive’s EC contribution at your specific dose rate and water chemistry. Adjust total nutrient solution strength to stay within the target EC range for the flowering stage. Typical target EC for mid-bloom in recirculating hydroponic systems is 1.8–2.5 mS/cm depending on crop species and growth stage.

pH adjustment after dosing: Because KH₂PO₄ is acidic, adding Sonic Bloom will lower solution pH. Always measure and adjust pH after all nutrients and additives have been dissolved and mixed. Do not pre-adjust pH before adding Sonic Bloom if it is one of the last additions to your mixing sequence.

Size selection guidance:

• 100 g: Trial size; approximately 20 doses at 1 tsp (roughly 5 g per tsp), suitable for small home systems or a single short crop cycle.
• 454 g (1 lb): Suitable for a single medium grow room through one full bloom cycle.
• 2.27 kg (5 lb, this size): Multi-cycle supply for a home grow room or small commercial operation; cost-effective per dose vs. the 1 lb size.
• 4.54 kg (10 lb) and above: Commercial scale; appropriate for multi-tent or multi-room production environments where a full season of bloom feeding is purchased at once.

How to Use Sonic Bloom in Your Feeding Schedule

The steps below describe integrating Sonic Bloom into a bloom-phase feeding program from initial setup through harvest flush. These steps adapt the per-category nutrient supplement generic template to the specific dose rate, timing window, and product restrictions published by Humboldt County’s Own.

1. Confirm your crop is at or approaching week 2 of the bloom phase. Sonic Bloom is not used during vegetative growth. Before opening the bag, verify that your plants have transitioned to the flowering stage — for photoperiod crops, the 12/12 light schedule has been running for at least 1–2 weeks and early flower structures (calyxes, pistils, or visible bract development) are present. For autoflowering varieties, early flower development should be clearly visible. Do not start Sonic Bloom at the first sign of the light schedule change; wait for visible flower development.
2. Confirm you are NOT currently using Crystal Burst. The brand explicitly states that Sonic Bloom and Crystal Burst should not be used together. If you are running Crystal Burst in your current crop cycle, do not add Sonic Bloom. If you have finished a Crystal Burst cycle and want to use Sonic Bloom in the next cycle, flush the reservoir completely before starting the new program. Choose one product for each crop cycle.
3. Prepare your base nutrient solution first. Mix your base nutrients at flowering-stage rates in the reservoir or mixing vessel. Measure EC after the base solution is fully prepared. Sonic Bloom is an additive, not a replacement for a complete base nutrient program — it provides phosphorus and potassium supplementation on top of a full NPK base.
4. Pre-dissolve the measured dose in a small volume of water. Measure 1 teaspoon of Sonic Bloom powder per 5 gallons of total reservoir volume using a calibrated measuring spoon. Add the powder to a cup or small container of reservoir-temperature water (approximately 500 mL) and stir until fully dissolved. The powder should dissolve completely without residue. If using a digital scale, approximately 5 g per teaspoon is a useful cross-check; adjust to the actual density of your specific lot if needed.
5. Add the pre-dissolved solution to the reservoir while the circulation pump is running. With the pump circulating or while stirring the reservoir, pour the pre-dissolved Sonic Bloom solution into the reservoir. Allow the pump or stirring to distribute the additive fully throughout the reservoir volume before taking readings.
6. Verify pH and EC after mixing all additives. After all nutrients and additives have been added and the solution is fully mixed, check pH and EC. Adjust pH to the target range for your system (5.8–6.2 for hydroponics, 6.0–6.8 for soil) using pH-up or pH-down. Record the final EC value. KH₂PO₄ is acidic — expect the pH to have dropped somewhat after adding Sonic Bloom, so budget for a pH-up adjustment after dosing.
7. Feed on your regular schedule and observe plant response. Apply the mixed solution at your normal feeding interval. During the first 1–2 applications, observe the plants for any signs of phosphorus or potassium excess (leaf tip burn, brown spotting, darkening leaf color in excess) or deficiency (purple stems, poor flower development). If signs of excess appear, reduce the dose to ½ teaspoon per 5 gallons for the following reservoir fill and re-evaluate. Most growers find the published 1 tsp per 5 gal rate is well-calibrated for the concentration of the formulation.
8. Continue application through the feeding schedule until 1 week before your targeted harvest date. Sonic Bloom is applied from week 2 of bloom through 1 week before harvest. On the final feeding week before your harvest date, discontinue Sonic Bloom along with any other additives and switch to a final flush or plain water protocol as appropriate for your methodology and substrate. Do not apply Sonic Bloom during the flush week.
9. Store unused powder correctly after each use. Reseal the bag securely after each measurement and store in a cool, dry location away from direct sunlight and humidity. Dry powder nutrients have excellent shelf stability when kept dry. Do not store in a location where the bag may be exposed to condensation, steam, or high humidity, as moisture can cause the powder to clump or degrade over time.

Sources & Further Reading