THC Grow A+B | High-Concentrate Vegetative Nutrient for Australian Hydroponic Growers

The vegetative phase is where yield potential is built. Root mass, stem strength, canopy size, and branching structure are all established before a single flower forms, and the nutrient program running during this phase determines the ceiling for everything that follows. THC Grow A+B is the vegetative component of the Total Horticultural Concentrate system, formulated in Australia using pharmaceutical-grade mineral salts and advanced chelation technology for consistent, high-performance vegetative results.

Ultra-concentrated at 2 to 4ml per litre, THC Grow delivers more active nutrition per millilitre than most conventional nutrient products, which means better value per litre and less product used per cycle without compromising plant development.

What THC Grow Delivers

The high-nitrogen, high-calcium profile in THC Grow drives rapid leaf production, thick stem development, and the dense, structured canopy that maximises light interception and flower site count going into bloom. Advanced chelation technology keeps micronutrients available across a wider pH range than conventional nutrient systems, which reduces the deficiency pressure that typically appears during fast vegetative growth and high EC feeding.

Pharmaceutical-grade mineral purity means the formula is free from chlorides, sodium, and urea. Clean mineral inputs protect root health, reduce salt accumulation in recirculating systems, and produce clearer reservoirs throughout the vegetative cycle. THC Grow is compatible with DWC, NFT, flood and drain, drip systems, coco coir, soil, and all standard indoor growing setups.

How to Use THC Grow

Always add Part A to your reservoir water first and mix thoroughly before adding Part B. Never combine the concentrates directly. Start at 2ml per litre during early vegetative growth and increase to 3 to 4ml per litre as plants establish and root systems develop. Check EC after mixing to confirm concentration matches your target for the current growth stage.

Target pH range is 5.5 to 6.5 for optimal nutrient uptake. The Bluelab Combo Meter measures pH, EC, and temperature simultaneously, which simplifies daily checks when running a 2-part concentrated system. When plants are ready to transition into flower, switch to THC Bloom A+B.

Frequently Bought Together

THC Bloom A+B — the flowering counterpart, switch to Bloom at first signs of flower
THC Grow and Bloom Complete Set — buy both stages together at a better per-litre rate

Product Details

Brand: THC (Total Horticultural Concentrate)
Formula: Grow A+B — High-Concentrate Vegetative Nutrient
Available sizes: 1L, 5L, 20L (A+B set)
Compatible with: DWC, NFT, flood and drain, drip, coco coir, soil
Dosage: 2 to 4ml per litre
Target pH: 5.5 to 6.5
Use: Vegetative phase through to pre-flower transition

Frequently Asked Questions

How do I mix THC Grow A+B correctly?

Always add nutrients to water, never add water to concentrated nutrients. Fill your reservoir with the target volume of fresh water first, then add each part of THC Grow A+B separately, stirring between additions. If using a multi-part formula, add micro or Part A first, then grow or bloom, then any additives. Measure pH and EC after mixing and adjust to your target range — typically 5.8–6.2 pH and 1.4–2.2 EC for most crops.

What is the shelf life of THC Grow A+B?

Unopened, THC Grow A+B has a shelf life of 2 years when stored in a cool, dark location out of direct sunlight. Once opened, use within 12 months. Shake or stir well before each use as some formulations can settle. Do not freeze concentrated nutrients as this can cause precipitation of minerals that will not fully redissolve.

Can I use THC Grow A+B in soil as well as hydroponics?

THC Grow A+B is formulated for hydroponic systems but can be used for soil and coco growing at adjusted rates. Soil typically requires lower EC than hydro or coco as nutrients are buffered by the growing medium. Start at 50–70% of the recommended hydroponic dose when applying to soil and increase based on plant response.

How do I dispose of leftover nutrient solution made with THC Grow A+B?

Dilute spent nutrient solution with water and use it to water outdoor garden beds or lawns — it is an excellent fertiliser for outdoor plants. Avoid disposing of large volumes directly into storm drains. In residential situations, diluted nutrient runoff down a household drain is acceptable in small quantities.

Does THC Grow A+B ship fast within Australia?

Yes — THC Grow A+B ships from our Australian warehouse with fast tracked delivery Australia-wide. Most east coast orders arrive within 2–5 business days. WA, NT, and TAS orders typically arrive within 5–12 business days.