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Frequently asked questions

Everything about GrowLog: what the app does, how to keep a growlog, and exactly how the calculated values on your growlogs are worked out.

About GrowLog

What is GrowLog?
GrowLog is a cultivation tracking platform for cannabis growers. You document a grow from start to harvest — plants, cultivars, environment, feeding, training, harvest and curing — and you can keep it private or publish it and share it with other growers whenever you feel like it.
Is GrowLog free?
Yes. Creating an account and keeping growlogs is free.
Do I need an account to read growlogs?
No. Public growlogs and public profiles can be read without signing in and can be indexed by search engines. You need an account to create growlogs, follow growers, like and comment.
What is the difference between a private and a public growlog?
A private growlog is visible only to you. A public growlog is visible to everyone, appears in search and discovery, and its photos, videos and comments inherit that visibility. You choose the setting when you create a growlog and can change it while the growlog is still open.
Does GrowLog work on a phone?
Yes. It is a mobile-first website and an installable app (PWA), so you can add it to your home screen and keep using recently opened pages when your connection drops.

Using the app

How do I start a growlog?
Open My garden and choose New growlog. Give it a name, pick the visibility, and fill in the setup: grow space and surface, medium, lights, initial light hours per day, and the start date. These values feed the statistics later, so it is worth filling them in.
How do I add plants?
Open the Plants tab of a growlog and add each plant or group of plants with its cultivar, label, source (seed or clone) and count. Events are always attached to plants, so a growlog needs at least one plant before you can log anything.
Where do cultivars, breeders and lights come from?
They come from a shared catalogue with autocomplete. If something is missing you can submit it while filling the form; staff review the submission and you get a notification once it is approved and visible to everyone.
What can I log as an event?
Watering and feeding, environment readings, training and pruning, transplanting, lighting changes, germination, flowering start, harvest, drying, curing, extraction, pest and problem notes, plus a custom event type for anything else. Every event has a date and time, a description, optional measurements and nutrients, and media.
How do photos and videos work?
You can attach up to 30 files per event, images and videos up to 100 MB. Images pass through a built-in editor for zoom, crop, rotate and pan. All location and camera metadata is stripped from files before upload automatically - for privacy reasons.
Can I edit or delete events?
Yes, as long as the growlog is still open. Once a growlog is closed its events are locked, so the record of a finished grow stays intact.
What are the social features?
You can follow growers and individual growlogs, like growlogs and events, comment and reply, and mention other users with @username. Likes, comments, replies, mentions, new followers and new events on growlogs you follow all arrive in the notification bell, and optionally as push notifications.
Metric or imperial units?
Pick your default in account settings. Metric shows °C, litres, m² and grams; imperial shows °F, gallons, sq ft and ounces. Values are always stored in one canonical unit and converted for display, so a public growlog can be read in either system.
What do the Closed and Abandoned markers mean?
Closed means you finished the growlog yourself: it becomes read-only. Abandoned is automatic — an open growlog with no harvest and no new event for 45 days is marked as abandoned. Adding a new event clears the marker.
How do I report content, or delete my account?
Every growlog, event, comment and profile has a report action that reaches moderators, and there is a report form in the footer. In account settings you can delete your account together with all of your growlogs, media and comments.

How calculated values are worked out

Grow days, veg days and flowering days
Day 1 is the growlog start date. Veg days count from the start date to the "flowering start" event. Flowering days count from the "flowering start" event to harvest, or to today while the grow is running. Total days is veg plus flowering.
VPD (vapor pressure deficit)
VPD is derived from your environment readings in kPa. Saturation vapor pressure is es(T) = 0.6108 · e^((17.27·T)/(T+237.3)) with T in °C. Without a leaf temperature: VPD = es(air) · (1 − RH/100). With a leaf temperature: VPD = es(leaf) − es(air) · RH/100. It needs air temperature and relative humidity, and is shown to two decimals.
Light energy consumption (kWh)
Energy is integrated day by day from the growlog start. Each day uses the light hours per day and the power setting in force on that day: watt-hours = combined light wattage × power % ÷ 100 × light hours. Every lighting change, flowering start and revegetation start opens a new period. The total is divided by 1000 for kWh and counted up to harvest, growlog close, or today for an ongoing grow.
Yield per watt (g/W) and per area (g/m²)
The yield used is the final dry weight from drying or curing events when available, otherwise the wet weight from harvest. g/W divides that weight by the effective light power (combined wattage × power % ÷ 100). g/m² divides it by the grow surface from the growlog setup. Imperial growlogs show oz/W and oz/ft².
Water and nutrient totals
Totals add up the volumes and nutrient doses recorded on watering and feeding events for the whole growlog, converted to your unit system. They only reflect what you logged, so a missing volume simply is not counted.
The statistics charts
The charts plot the measurements from your events over time — temperature and humidity day and night, VPD, pH, EC, water volume, CO₂ and light hours. Each point is one logged event, so denser logging gives a more detailed curve. Nothing is estimated or interpolated.