A Quick Look at U.S. Water pH
A quick county-level look at 2024 U.S. water pH observations.
Category Grow Science
VPD Leaf Offset
Most VPD charts quietly assume the leaf is the same temperature as the air around it. In a real tent, that is usually wrong enough to matter. Leaves transpire. That evaporation cools the leaf surface, so a canopy sitting in…
Demystifying DLI
DLI is the number I care about when I am setting grow lights, because it combines intensity and time into one daily total. PPFD tells you how strong the light is at the canopy right now. DLI tells you how…
A New Start
The last grow attempt failed at a very early stage which was quite annoying, but in the scheme of things, could be much worse. This time I am paying more attention to germination. I started by soaking the seeds in…
What Actually Makes a Cannabis Seed Germinate
A post-mortem on a bad batch, and what the evidence says about what matters. The batch that made me write this I lost more seedlings than I want to admit on the last run. Tap roots that emerged but stalled.…