Growers' Guides
Coco Coir Guide: Choosing, Feeding and Reusing Coco
What coco coir is, the coco mixes worth buying, how it compares with clay pebbles and rockwool, and how to feed and reuse it.
Fabric, Air-Pot or Plastic Pots? How to Choose (and What Size)
Air-Pots, fabric pots and plastic pots compared: how air-pruning works, which dries out fastest, and which size for seedlings, mothers and big plants.
VPD Chart: What Vapour Pressure Deficit Means for Your Plants
VPD explained in plain terms, with a chart by temperature and humidity, the ranges to aim for at each stage, and how to measure and control it.
pH and EC Meters: How to Measure, Calibrate and Look After Them
What pH and EC tell you, the targets nutrient makers publish, which meter to choose, and how to calibrate it and look after the probe.
Propagators and Cuttings: How to Root Cuttings and Start Seeds
Choosing a heated or unheated propagator, the best starter plugs, and how to take cuttings that root, with Clonex, Jiffy pellets and propagation lights.
Autopot Systems Explained: How They Work and Which to Buy
How Autopot works without pumps or power, which system and pot size suits your space, what to grow in, and how to set it up.
How to Size an Extraction Fan and Carbon Filter for Your Grow Tent
Work out the inline fan and carbon filter your grow tent needs: tent volume, air changes a minute, the filter allowance, and a table by tent size.
What Size Grow Tent Do I Need?
Plants per tent by pot size, the height a light needs, where Budbox, Secret Jardin and AC Infinity tents fit, loft tents, and kit or separate parts.
LED Grow Light Wattage by Tent Size (and LED vs HPS)
How many watts of LED a tent needs: 300-500 W/m² in flower, a table by tent size, the Maxibright, Gorilla and Adjusta-Watt fixtures that fit, and LED vs HPS.
LED or HPS? Why the Best Growers Use Both
Tom's view from twenty years in the shop: run LED as the main light and add a dimmable HPS, metal halide or CMH for flowering weeks 3-7 for a better finish.
Fungus Gnats (Sciarid Flies): How to Get Rid of Them
Small black flies around your pots? They're fungus gnats, or sciarid flies. How to spot them, why they appear and how to get rid of them for good.
Thrips on Plants: How to Spot the Damage and Get Rid of Them
Silvery streaks and black dots on your leaves? How to spot thrips and their damage, why they're hard to shift, and how to get rid of them.
Red Spider Mite: How to Spot It and Get Rid of Spider Mites
Pale speckled leaves and fine webbing? How to spot red spider mite, why it spreads so fast in warm rooms, and how to get rid of spider mites.
Advanced Nutrients Feed Chart: Sensi Grow & Bloom by Week
The Advanced Nutrients feed chart for pH Perfect Sensi Grow and Bloom (and Sensi Coco): base and additive doses week by week in ml per litre.
Athena Feed Chart: Blended and Pro Line Schedules (Metric)
The Athena feed chart in metric: Blended Line and Pro Line doses week by week, with EC, pH, pre-soak and flush from Athena's own schedules.
Plant Magic Feed Chart: Coco, Hydro and Soil Schedules
The Plant Magic feed chart for coco, hydro and soil: Essential and Ultimate schedules week by week in ml per litre, from Plant Magic's own charts.
Canna Coco Feed Chart: A & B, Additives and EC by Week
The CANNA COCO feed chart week by week: COCO A & B doses, when Rhizotonic, CANNAZYM, CANNABOOST and PK 13/14 go in, and the EC to aim for.
Canna Terra Feed Chart: Vega, Flores and Additives by Week
The CANNA Terra feed chart for soil: Terra Vega and Flores doses week by week, the additives, and the EC to aim for, from CANNA's own schedule.
Canna Aqua Feed Chart for Hydroponics: Doses and EC by Week
The CANNA Aqua feed chart for recirculating hydroponics: Aqua Vega and Flores A & B doses week by week, the additives and the EC to aim for.
Biobizz Feed Chart 2026: All·Mix and Light·Mix Schedules
The Biobizz feed chart week by week for Light·Mix, Coco·Mix and All·Mix: Bio·Grow, Bio·Bloom, Top·Max, Root·Juice and the boosters in ml per litre.
The Importance of Airflow, Temperature & Humidity in a Grow Room
Creating the perfect environment inside your grow room isn’t just a matter of comfort for your plants - it’s the foundation of healthy growth, efficient…
Getting Started
This guide aims to help beginners understand how to start growing indoors, what you need, what to know, and how to plan.