Grower Glossary – VUpdated 9 days ago

V

“V” stands for veg, vigor, and VPD — the vital trio that powers every phase of plant life. Learn how vapor pressure, ventilation, and vegetative growth interact for maximum performance.

Vacuum Seal

The process of removing air from packaging to preserve freshness and prevent oxidation.
Grower Slang: “Vac seal.”
Cronk Tip: Vacuum-sealed jars or bags lock in terpenes and extend shelf life for months.

Valence (Chemistry)

The bonding capacity of an atom, determining how it interacts with other elements.
Grower Slang: “Bond strength.”
Essential for nutrient formulation and solubility — Cronk Nutrients’ blends are designed for stable ionic balance.

Vanilla Leaf (Slang)

Grower slang for plants that look healthy but lack smell or frost.
Grower Slang: “Flat terp,” “low resin.”
Usually caused by stress, poor lighting, or genetic drift.

Vapor Pressure

The measure of how readily water evaporates at a given temperature.
Grower Slang: “Air moisture push.”
High vapor pressure = faster transpiration and drying rates.

Vapor Pressure Deficit (VPD)

The balance between air temperature and humidity that determines transpiration rate.
Grower Slang: “VPD,” “humidity gap.”
Cronk Tip:

• Seedlings: 0.8–1.0 kPa

• Veg: 1.0–1.2 kPa

• Flower: 1.2–1.5 kPa
  Stable VPD = steady water movement and nutrient uptake.

Variable Speed Fan

A controllable fan for precision climate management.
Grower Slang: “Fan dial,” “speed fan.”
Cronk Tip: Use in tandem with a VPD sensor for environment automation.

Variegation

When leaves show multiple colors due to genetics or nutrient stress.
Grower Slang: “Tiger leaf,” “mutie.”
Some cannabis strains show natural variegation — others indicate viral issues.

Variety (Cultivar)

A distinct form or strain within a species bred for specific traits.
Grower Slang: “Strain,” “cut.”
Cronk Tip: Record phenotypes during runs to identify top-performing varieties.

Vegetative Phase (Veg Stage)

The period focused on growth of leaves, stems, and roots before flowering.
Grower Slang: “Veg time.”
Cronk Tip: 18/6 or 20/4 light cycle, strong nitrogen feed, and even canopy training set up high-yield bloom.

Vegetative Growth Rate

The pace of development during veg — a key yield predictor.
Grower Slang: “Growth speed.”
Cronk Tip: Track node spacing and leaf color to monitor vigor and nutrient balance.

Veg Light

Lighting optimized for vegetative spectrum (blue-heavy).
Grower Slang: “Grow blue.”
Cronk Tip: 6500K LEDs promote tight node spacing and bushy plants.

Veg Out (Grower Slang)

Grower slang for both rapid vegetative growth and downtime after long grow sessions.
Grower Slang: “Chill grow.”
Cronk Tip: Let your plants — and yourself — “veg out” between cycles for consistency and mental reset.

Veg Room

A dedicated space for plants in vegetative stage.
Grower Slang: “Green room.”
Cronk Tip: Maintain higher humidity (60–70%) and rich nitrogen feeding.

Veg Time

The duration of the vegetative phase before flowering.
Grower Slang: “Grow time.”
Longer veg = more yield, but requires larger root volume and space.

Ventilation

Airflow system that exchanges old air with fresh, CO₂-rich air.
Grower Slang: “Airflow,” “breath.”
Cronk Tip: Replace air every 1–2 minutes for optimal temperature and CO₂ control.

Vertical Grow

Stacking plants vertically to maximize light and space efficiency.
Grower Slang: “Tower grow,” “stack setup.”
Cronk Tip: Essential for high-density commercial operations — keep air circulation balanced between tiers.

Vermiculite

A natural mineral that expands when heated, improving soil water retention.
Grower Slang: “Moist mix.”
Cronk Tip: Ideal in seedling and clone media for consistent moisture.

Vernalization

Cold exposure process that triggers flowering in some plants.
Grower Slang: “Cold start.”
More relevant to breeding and seed prep than active cannabis growing.

Viability (Seed Viability)

The potential of a seed to germinate successfully.
Grower Slang: “Live bean.”
Cronk Tip: Store seeds in dark, dry containers at 8–10°C (46–50°F).

Vigor (Plant Vigor)

The plant’s overall strength, growth speed, and resilience.
Grower Slang: “Beast mode.”
Cronk Tip: Vigorous plants have thick stems, deep roots, and high chlorophyll content.

Viral Pathogen

A microscopic organism that infects and disrupts plant processes.
Grower Slang: “Sick cut.”
Cronk Tip: Hop Latent Viroid (HLVd) is a major cannabis threat — always sanitize tools and isolate new clones.

Visqueen (Grow Material)

Durable polyethylene sheeting used as a vapor barrier or wall liner.
Grower Slang: “Grow plastic.”
Cronk Tip: Use reflective white Visqueen for affordable light diffusion.

Visual Deficiency Diagnosis

Identifying nutrient issues by leaf color, shape, or pattern.
Grower Slang: “Leaf reading.”
Cronk Tip: Compare symptoms with Cronk’s Deficiency Chart for fast corrections.

Visual Stress (Lighting Term)

Light glare that affects human eyesight or plant health under intense LEDs.
Grower Slang: “Grow glare.”
Cronk Tip: Use full-spectrum-safe glasses to view true colors under LED.

Vitamin B Complex (Plant Additive)

Growth supplement that helps reduce transplant and environmental stress.
Grower Slang: “B booster.”
Cronk Tip: Use post-transplant for faster recovery and root expansion.

VOCs (Volatile Organic Compounds)

Gases emitted from solvents, fertilizers, or resins.
Grower Slang: “Off-gassing.”
Cronk Tip: Ventilate curing and nutrient rooms to prevent odor buildup.

Volt / Voltage (Electrical Term)

Measurement of electrical potential in grow systems.
Grower Slang: “Power level.”
Cronk Tip: Always match ballasts and fixtures to correct voltage to prevent overload.

Volume (Container Volume)

The capacity of a pot or growing medium.
Grower Slang: “Pot size.”
Cronk Tip: 1 gallon per month of growth is a good rule of thumb for cannabis.

Vortex Mixer

A swirling motion or device that fully blends nutrient solutions.
Grower Slang: “Swirl mix.”
Cronk Tip: Stir each component until dissolved before adding the next to avoid precipitation.

VPD (Vapor Pressure Deficit) Chart

A grower reference showing ideal temp/humidity combinations by growth stage.
Grower Slang: “Humidity chart.”
Cronk Tip: Keep a printed VPD chart in every grow room for quick checks.

VPD Drift

When VPD fluctuates due to inconsistent climate control.
Grower Slang: “Humidity swing.”
Cronk Tip: Smart controllers stabilize VPD automatically and boost plant performance.

VPD Sensor / Monitor

Device that calculates VPD using real-time temperature and humidity data.
Grower Slang: “Climate meter.”
Cronk Tip: Pair with smart humidifiers or fans for precision control.

V-Scrog (Vertical SCROG)

A vertical Screen of Green technique using mesh walls.
Grower Slang: “Wall grow.”
Cronk Tip: Doubles canopy surface area for compact grow spaces.

VSC (Variable Speed Controller)

Device that adjusts fan or pump speed.
Grower Slang: “Fan dial.”
Cronk Tip: Use VSCs for stealth grows or to fine-tune airflow noise levels.

Vulcanization (Material Term)

Chemical process used to harden rubber tubing or grow tent seals.
Grower Slang: “Rubber cure.”
Ensures durability in irrigation and air lines.

VPD Zone

The consistent humidity and temperature range plants thrive in.
Grower Slang: “Comfort zone.”
Cronk Tip: Maintain this zone for maximum transpiration efficiency.

VPD Controller

Automated unit managing humidity, temp, and fan speed to maintain ideal VPD.
Grower Slang: “Climate brain.”
Cronk Tip: Set your grow room to “cruise control” for steady results.

Vortex Fan

Fan with a spiral airflow pattern for superior circulation.
Grower Slang: “Cyclone fan.”
Cronk Tip: Ideal for large grow tents or vertical grows needing even distribution.