CannaGLAP
The Canna GLAP grow blog
Straight answers for home growers, checked against research. Start with the tent series if you are setting up, or jump to the question you have today.
Grow tent series
Carbon filters for grow tents: size, setup and when to replaceHow a carbon filter controls grow tent smell, how to size it to your fan CFM, where to mount it, why humidity kills it early, and when to replace it.How to clean a grow tent between growsHow to clean a grow tent between grows: clear debris, wash, disinfect for the full contact time, clean pots, fans and filters, then check for light leaks.What size fan does a grow tent need?What size grow tent fan do you need? Work out CFM from tent volume, carbon filter losses and your light's heat, with a fan size chart for 2x2 to 4x8 tents.Grow tent setup checklistA grow tent setup checklist in build order: power and GFCI, exhaust and carbon filter, light and timer, sensors, a light leak test and a 48-hour dry run.Grow tent too hot? How to bring it downGrow tent too hot? See the temperature where cannabis starts to suffer, the CFM math to carry heat out, and the fixes to try first, cheapest first.How many plants fit in a 4x4 grow tent?How many plants in a 4x4 tent? Four is the sweet spot, one or two trained plants can fill it, and sea of green fits 16. Spacing, pot sizes and what sets yield.How many watts of LED does a grow tent need?How many watts of LED does your grow tent need? About 25 to 40 actual watts per sq ft for flower: 400 to 600 W for a 4x4. The formula, tables and spec checks.How high should an LED grow light be at each stage?How high to hang an LED grow light for seedlings, veg and flower: the PPFD and DLI targets by stage, how to read a maker's chart, and signs it is too close.How to lower humidity in a grow tentHow to lower humidity in a grow tent: run the exhaust harder, dry the room it breathes from, size a dehumidifier and stop the spike after lights off.Passive vs active intake: which does your tent need?Passive vs active intake for a grow tent: how big passive vents must be, when an intake fan helps, and how to keep the negative pressure that controls smell.How to raise humidity in a grow tentHow to raise humidity in a grow tent: slow the exhaust, add a humidifier on a humidistat with distilled water, and know which stages need more moisture.Soil, coco or hydro in a grow tent: which should you choose?Soil, coco or hydro in a grow tent: how each one differs in pH, feeding, watering and room for error, and which fits your schedule and your first grows.How to train cannabis plants to fill a grow tentTraining cannabis to fill a grow tent: when to top, how to use LST and a ScrOG net, when to flip, and what changes for autoflowers. Plain steps, real timing.Two tent setup: how to run a veg tent and a flower tentHow a two tent setup works: sizing the veg and flower tents, light schedules, a timing plan for harvests every 8 to 11 weeks, and the mistakes that cost a crop.What size grow tent do I need?What size grow tent do I need? Match tent size to your plant count, LED wattage, height and room space, with a size table and the simple math behind each pick.
Growing
Autoflower vs photoperiod: which should you grow?Autoflower vs photoperiod cannabis: what triggers flowering, light schedules, seed to harvest times, size, training and cloning, and how to pick for your tent.Cannabis feeding schedule basicsCannabis feeding schedule basics: what to feed seedlings, veg and flower, how strong to mix it, how soil and coco differ, and what research says about flushing.Cannabis grow week by week: the full indoor timelineA cannabis grow week by week, from seed to jar: what happens in each stage, light schedule, temperature, humidity and VPD targets, and what to check every week.What size pot does a cannabis plant need?A cannabis pot size guide: which pot for photoperiods and autoflowers, how many fit a tent, when to transplant, and fabric vs plastic, in gallons and liters.What is wrong with my cannabis seedling?Seedling problems and fixes: stretching, damping off, overwatering, yellow cotyledons, nutrient burn, drooping and slow growth, and what to check first.How much does one cannabis plant yield?Cannabis yield per plant, per square foot and per watt, from published studies, what really changes yield, and how to measure your own by logging dry weight.Should I defoliate and lollipop my cannabis plants?Defoliation and lollipopping explained: what to remove, why it helps airflow, light and mold risk, when to do it around the flip, and how much is too much.What happens each week of the cannabis flowering stage?The cannabis flowering stage week by week: stretch, first flowers, bulking and ripening, with what to check each week and the problems that show up when.How to germinate cannabis seedsHow to germinate cannabis seeds: the best temperature, paper towel vs direct sowing, planting depth, how long it takes, and what to do if a seed fails.How much does a grow tent cost in electricity?How much electricity does a grow tent use? The simple formula, worked examples for 2x4 and 4x4 tents at an 18 cent rate, and how to find your real cost per kWh.Hermaphrodite cannabis and nanners: spot them, then actHermaphrodite cannabis and nanners: how to tell nanners from pollen sacs, what research says causes them, and what to do before one plant seeds the tent.Cannabis home grow laws by state (as of October 2026)Cannabis home grow laws by state as of October 2026: plant limits per adult and per home, key conditions, and a link to each state's official source.How often should you water cannabis?How often to water cannabis in soil or coco: why pot weight beats a calendar, how much to pour, the 10 to 20 percent runoff rule, and overwatering fixes.How to clone cannabisHow to clone cannabis step by step: choosing the cutting, rooting hormone, the right humidity and temperature, what to expect day by day, and why clones fail.How do you dry and cure cannabis?How to dry and cure cannabis at home: the room temperature and humidity research uses, how many days, the stem snap test, jarring, burping and mold signs.How to keep a grow journal that makes your next grow betterHow to keep a cannabis grow journal that actually helps: what to log daily and weekly, how to read pH and EC runoff trends, photo habits, and a simple template.Light leaks and light schedules: protect the dark periodLight leaks and light schedules for cannabis: why the dark period controls flowering, how little stray light it takes, and a 10 minute test to find every leak.Is 18/6 or 20/4 better for cannabis?18/6 vs 20/4 vs 24/0 light schedules for cannabis in veg: what daily light integral means, what extra hours cost in power and heat, and what changes for autos.Living soil and no-till: the basics for indoor growersLiving soil and no-till cannabis basics: how soil life feeds the plant, why you stop tilling, how to build and reuse a bed, watering, top-dressing and mistakes.How do I tell if my cannabis plant is male or female?Male vs female cannabis: where preflowers show, when to look, males vs hermaphrodites, feminized vs regular seeds, and what to do with a male.Cannabis pH and PPM chart by stageA cannabis pH and PPM chart by stage: pH for soil, coco and hydro, EC with ppm on the 500 and 700 scales, how to measure it right, and what runoff tells you.Should you flush cannabis before harvest?Should you flush cannabis before harvest? What two controlled studies found about yield, minerals and cannabinoids, what it cannot do, and what to do instead.Topping vs FIMing: which cut should I use on my cannabis plant?Topping vs FIMing cannabis: what each cut is, where to make it, how many nodes to wait for, what the research found, and which one suits a small tent.When to harvest cannabis: how to read the trichomesWhen to harvest cannabis by its trichomes: what clear, cloudy and amber mean, how to check them with a loupe, and the backup signs that confirm the window.When should I switch my plants to 12/12?When to switch photoperiod cannabis to 12/12: size the plants for the stretch, count your headroom, pick your veg time, and know what the first two weeks bring.
Problems with a plant?
Match the leaf in the grow problem library, or read the monthly guides.