Sensi Grow Part A is one half of the vegetative base in Advanced Nutrients' pH Perfect Sensi system. Used together with Sensi Grow Part B during the veg stage, it delivers the calcium, iron, and base nutrition cannabis plants need to build strong vegetative structure before the flip to flower. The pH Perfect technology self-buffers your reservoir into the 5.5 to 6.3 plant-available range automatically, which is genuinely useful on hard tap water and for growers who don't want to chase pH manually every feed.

One honest note from our side of the counter: run Sensi at half the chart-recommended dose. Forum experience across 10-plus years is consistent that the AN chart is calibrated for fully optimized environments (CO2 enrichment, high PPFD, tight VPD), and most rooms get tip burn at full strength. Start at 2 mL/gallon of each part, watch the plants, and ramp only if they respond cleanly. We'd rather tell you that up front than sell you a second bottle to fix the first.

Sensi Grow Part A is the standard hydro and soil formulation. For coco specifically, use Sensi Coco Grow instead, which carries the adjusted calcium and magnesium ratios coco's cation exchange behavior needs.

Sensi Grow Part B completes the vegetative base of Advanced Nutrients' pH Perfect Sensi system. Run with Sensi Grow Part A during veg, it supplies the phosphorus, potassium, and complementary nutrition that balances the calcium-and-iron-heavy Part A. The two-part design is what lets AN tune the veg-stage nutrient ratio precisely, the foundation of the brand's "Hit the Shift" architecture that shifts micronutrient ratios between veg and flower.

Same honest dosing note applies: start at half the chart dose (2 mL/gallon) rather than the full 4 mL/gallon. The AN chart targets maximum-yield conditions most rooms can't push without burning the plants. Half strength is where the long-term AN community has consistently landed.

This is the standard hydro and soil Part B. Coco growers should run Sensi Coco Grow instead for the coco-adjusted calcium and magnesium ratios.

Sensi Bloom Part A is one half of the flowering base in Advanced Nutrients' pH Perfect Sensi system. Run with Sensi Bloom Part B from the flip through late flower, it delivers the amino acids, calcium, and base nutrition cannabis plants need to build dense, resinous flower. The pH Perfect buffering holds your reservoir in the plant-available range automatically, and the bloom-stage formulation shifts the micronutrient ratio toward what flowering plants actually use (more nitrogen, potassium, and zinc; less of the calcium and iron emphasis of the veg formula).

The half-strength rule matters most in bloom. Full chart strength in flower is the most common cause of tip burn and the calcium issues growers blame on other things. Start at 2 mL/gallon of each part and ramp toward 3 mL/gallon at peak bloom only if the plants are vigorous and unstressed.

Standard hydro and soil formulation. Coco growers use Sensi Coco Bloom instead.

Sensi Bloom Part B completes the flowering base of Advanced Nutrients' pH Perfect Sensi system. Run with Sensi Bloom Part A through flower, it delivers the precise NPK ratio that drives bud development and density. The two-part bloom design is what lets AN dial the flowering nutrient profile precisely, separating the amino-acid-and-calcium emphasis of Part A from the targeted NPK of Part B.

Half-strength dosing is the rule, especially in bloom. Start at 2 mL/gallon of each part, ramp toward 3 mL/gallon at peak only if the plants handle it cleanly. The chart's full strength is built for fully optimized rooms; most setups burn at that level.

Standard hydro and soil formulation. Coco growers use Sensi Coco Bloom instead.