Soul LBS – 3 lb

Soul LBS is a water-soluble bloom booster from Aurora Innovations formulated with a 0.5-40-30 NPK ratio. It delivers targeted phosphorus and potassium during the flowering stage while adding Bacillus subtilis biology and a sucrose sugar feed to support root-zone activity. Designed to complement a complete primary nutrient program in soil or soilless growing systems.

Soul LBS – 3 lb Specifications

Soul LBS is a dry, water-soluble powder. Key specifications are drawn from the product label and the canonical data for this SKU (ROSSLBS3).

Specification	Value
Brand	Aurora Innovations
Product Name	Soul LBS
NPK Ratio	0.5 – 40 – 30
Pack Size	3 lb (approx. 1.36 kg)
Form	Water-soluble dry powder
Derived From	Potassium Nitrate, Monopotassium Phosphate, Potassium Sulfate, Copper Sulfate, Zinc Sulfate, Bacillus subtilis, Sucrose
Biological Component	Bacillus subtilis (beneficial bacteria)
Carbohydrate Additive	Sucrose (sugar energy source)
Primary Use	Bloom / flower stage booster
Growing Medium	Soil and soilless (hydro, coco)
SKU	ROSSLBS3

Why Choose Soul LBS – 3 lb

Soul LBS is built around one principle: give flowering plants exactly what they need during the bloom stage, without diluting that delivery with unnecessary nutrients. Here is what distinguishes it from generic bloom additives:

• High-phosphorus, high-potassium formula: The 0.5-40-30 NPK is weighted heavily toward phosphorus (P) and potassium (K) — the two macronutrients most demanded during flowering. The trace nitrogen (0.5) is enough to keep the plant functional without pushing vegetative growth at the wrong time.
• Easy-dissolving dry powder: Unlike liquid bloom boosters that require refrigeration or careful handling, Soul LBS dissolves readily in water. This makes it practical for reservoirs, hand-watering, and fertigation systems alike.
• Biology plus nutrition in one product: Aurora Innovations incorporates Bacillus subtilis — a well-known beneficial soil bacterium — alongside the mineral nutrients. Bacillus subtilis colonizes the root zone and can improve nutrient uptake and root health. The sucrose component acts as an energy source supporting microbial activity.
• Micronutrient blend included: Copper sulfate and zinc sulfate are included in the formulation to address common micronutrient deficiencies that often appear during heavy flowering. These trace elements support enzyme function and overall plant metabolism at a critical growth phase.
• Designed to complement a complete nutrient program: Soul LBS is positioned as a supplement, not a standalone fertilizer. Aurora Innovations recommends using it alongside their Soul nutrient base, which gives growers predictable, stackable results rather than guessing how to balance a single-product approach.

Best Uses for Soul LBS – 3 lb

Soul LBS is classified as a Growth and Bloom Booster in the Additives subcategory of Nutrients and Additives. It is most effective in the following scenarios:

• Late vegetative to full bloom transition: Introduce Soul LBS when flowering sites begin to form. The elevated P and K levels support the transition away from leaf mass production and toward flower development and weight accumulation.
• Soil and amended growing media: The biological component (Bacillus subtilis) thrives in living soil and amended mixes. Growers using organic or mixed-input programs will benefit from the biology working in concert with existing microbial populations in the substrate.
• Soilless and hydroponic systems: The water-soluble dry powder dissolves cleanly into reservoir water. In coco coir or rockwool systems, the mineral P and K components are immediately plant-available, while the biological fraction can still colonize root surfaces in recirculating and drain-to-waste setups.
• Growers running Aurora Innovations Soul nutrients: Soul LBS is explicitly designed to work within the Soul nutrient line. If you are already using Soul Grow, Soul Bloom, or other Soul base nutrients, LBS integrates directly into that feeding program without creating nutrient conflicts.
• Addressing phosphorus or potassium shortfalls mid-flower: If plants show signs of P or K deficiency during mid-bloom — purpling of stems, weak flower structure, or slow fruit development — Soul LBS provides a concentrated, targeted correction without loading the plant with unwanted nitrogen.
• Commercial and hobbyist growers seeking scalable dry nutrients: Dry concentrates store longer and ship more cost-effectively than liquids. The 3 lb pack is appropriate for small to mid-scale operations running multiple cycles per year. For comparison, growers managing larger reservoir volumes may also want to evaluate Earth Juice Hi-Brix molasses as a companion carbohydrate supplement.

Soul LBS vs Similar Products

Soul LBS competes in the water-soluble bloom booster segment alongside other high-P/K dry or liquid products. The primary point of comparison for this SKU comes from the alternates data, where the same product (ROSSLBS3) is available through a secondary distributor at approximately $52.46 — close to the $53.30 price here. Because the product is identical, the purchasing decision comes down to stock availability and shipping rather than formulation differences.

More meaningfully, growers evaluating Soul LBS against generic bloom boosters should consider the biological component. Many competing high-P/K products contain only mineral inputs (monopotassium phosphate, potassium nitrate) without any microbial inoculants. Soul LBS includes Bacillus subtilis, which positions it closer to a bio-mineral hybrid booster rather than a purely synthetic additive. Growers who prioritize living root zones — particularly those running soil or coco with existing microbial inoculants like Advanced Nutrients Tarantula — may find that Soul LBS layers well with their existing biology program rather than competing with it.

Growers looking for a purely organic carbohydrate supplement as a companion product might also consider a molasses-based additive. Soul LBS contains sucrose as a microbial energy source, but some growers prefer to keep their bloom mineral and carbohydrate inputs separate for more granular control over EC and sugar loading.

Compatibility

Soul LBS is formulated for use in a wide range of growing environments:

• Soil: Compatible with amended potting mixes, living soils, and standard potting media. The Bacillus subtilis component is particularly active in soil with existing organic matter.
• Soilless / Coco Coir: Dissolves cleanly and delivers plant-available P and K without binding to coco in the way that some organic P sources can. Use alongside a balanced coco-specific base nutrient program.
• Hydroponics (recirculating and drain-to-waste): Compatible with standard recirculating systems (DWC, NFT, ebb-and-flow). The mineral salts are fully soluble. Monitor EC carefully when stacking with other P/K-heavy bloom additives to avoid excess.
• Aurora Innovations Soul nutrient line: Aurora Innovations explicitly recommends using Soul LBS alongside their Soul base nutrients. This is the primary intended pairing for the product.
• Other nutrient programs: Soul LBS can supplement most balanced primary fertilizer programs, but growers should calculate total P and K inputs across all products before adding LBS to an existing schedule to avoid nutrient excess in late flower.

If you are building a root-zone biology program, Soul LBS pairs well with dedicated microbial inoculants. Products like Advanced Nutrients Tarantula introduce a broader spectrum of beneficial bacteria and fungi, which can work alongside the Bacillus subtilis in Soul LBS to support root health across the full grow cycle.

Dosing Guidelines

Soul LBS is a concentrated water-soluble powder and should be used as a bloom-stage supplement within a complete nutrient program. The following general guidance applies to this product type. Consult the Aurora Innovations feeding chart on the product label or the Roots Organics website for exact dose rates per gallon by crop and week.

• When to start: Begin application when flowering sites develop and pre-flowers are visible. This typically corresponds to the first one to two weeks of the bloom phase.
• General dissolution: Pre-dissolve the measured powder in a small volume of pH-adjusted water before adding to the main reservoir or watering can. This prevents clumping and ensures an even mix.
• EC monitoring: Soul LBS contributes to the overall electrical conductivity of your nutrient solution. After adding LBS, check EC before feeding to confirm you are within the target range for your crop’s current growth stage. Do not assume EC from the base nutrients alone once a bloom booster is introduced.
• pH range: Target a final solution pH of 5.8–6.2 for hydroponic and soilless applications, or 6.0–6.8 for soil. Adjust pH after adding all nutrients, including Soul LBS.
• Frequency: Typically applied with each watering during the bloom phase or on a schedule specified in the Aurora Innovations feeding chart. Do not apply at maximum dose continuously without monitoring plant response and runoff EC.
• Complementary inputs: Aurora Innovations recommends pairing Soul LBS with a complete Soul base nutrient program. Do not use Soul LBS as a standalone fertilizer — its near-zero nitrogen means plants require a full-spectrum base to avoid deficiencies in N, calcium, magnesium, and other nutrients.

How to Use Soul LBS

1. Measure your dose: Using a calibrated scale or measuring spoon, measure the appropriate amount of Soul LBS powder per the Aurora Innovations feeding chart for your crop type and flowering week. Start at the lower end of the recommended range until you have established how your specific cultivars respond.
2. Pre-dissolve in water: Add the measured powder to a small container of pH-neutral water (approximately 0.5–1 litre). Stir until fully dissolved before adding to your main reservoir or feed bucket. This step ensures even distribution and prevents undissolved granules from settling.
3. Add to reservoir or watering can: Pour the pre-dissolved solution into your main water volume after adding your base nutrients. Always add nutrients to water, not water to concentrate.
4. Check EC: After adding all nutrients, measure EC. Confirm the total is within the target range for the bloom stage. If EC is too high, dilute with plain water before feeding.
5. Adjust pH: After all nutrients are combined, adjust the final solution pH to the appropriate target range for your growing medium (5.8–6.2 for soilless/hydro; 6.0–6.8 for soil). pH affects nutrient availability, including phosphorus uptake.
6. Feed and observe: Apply the solution at root zone. Observe plants over the following days for signs of uptake — deepening flower color, increased turgidity — or stress signs such as tip burn or leaf curl, which may indicate the dose or EC is too high for the current growth stage.
7. Store remainder correctly: Reseal the bag tightly after each use. Store in a cool, dry location away from direct sunlight and moisture. Dry powder is shelf-stable when kept dry; exposure to humidity can cause clumping.

Sources & Further Reading