🌬️Beyond VPD & Into The SPAC, with Nik from Rooted Leaf

Update: 2025-04-28

Description

Nik from Rooted Leaf Nutrients (use code GROWCAST) returns for another deep dive- this time moving away from soil fertilizer elements and delving into watering dynamics. Nik introduces us a concept called SPAC, or soil, plant, air, continuum (AKA the soil, plant, atmosphere continuum). This concept encompasses a more holistic view when it comes to optimal climate conditions in our cannabis grows- whereas singular metrics like VPD can sometimes be only part of the picture. Nik discusses how we should be thinking about what happens to all that water that we dump into the soil system after we put it in there... Plants, after all, are just water lifting mechanisms designed to move that water from the soil into the atmosphere. Understanding and mastering this cycle leads to a healthier, and more vigorous garden.

Intro 0:00

Cult Cup Experience 2:32

Watering and Soil Moisture 5:52

VPD and Light Intensity 7:56

Soil Water Potential 20:52
Air & Water Pressure Differences 29:41
Biological Changes in Water Consumption 33:15

The SPAC Cycle in Nature 42:26

Final Thoughts 53:39

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