✦ Scan the QR code on your bottle: batch, bottling date, lab reports – no login needed ✦

🎬 Free course

Temperature, Humidity & VPD

Fertiliser and light supply the ingredients, but the air decides how much of it actually arrives. This course explains transpiration as the plant’s delivery service, VPD as the one number made from temperature and humidity, and how to tell climate stress apart from nutrient deficiency.

🔒

Registered users only

This course is free – all you need is an account.

Sign In Create account
1

The Plant Sweats – Transpiration as the Engine of Feeding

Transpiration isn’t water loss – it’s the plant’s delivery service.
2

VPD – One Number from Two Readings

Relative humidity alone lies – VPD is the EC of the air.
3

Recognising Climate Stress – and Telling It Apart from a Deficiency

A deficiency reads the floor plan, climate stress reads the calendar and the map.