Hemp
Pronounced / HEMP /
Cannabis grown for fiber, seed or CBD and legally defined by a low THC limit. The exact limit depends on where you are.
Example in a sentence
“Under US federal law, cannabis testing at or below 0.3% delta-9 THC by dry weight is classified as hemp.”
Read more about Hemp
Leaf Doctor
Hemp russet mites: the pest you can’t see
Upward-curling leaf edges and a dull, bronzed look, with no webbing and no bugs you can find, may mean russet mites. They're…
Business
Congress closes the 2018 Farm Bill hemp loophole, capping hemp products at 0.4 mg total THC per container
Signed into law on November 12, 2025 as part of the FY2026 federal spending package, Congress rewrote the federal definition of hemp…
Federal Law
The 2018 U.S. Farm Bill removes hemp and hemp-derived CBD from the Controlled Substances Act
Signed into law on December 20, 2018 after overwhelming bipartisan votes in Congress, the Agriculture Improvement Act of 2018 federally descheduled cannabis…
Grow guide
Nutrient burn, salt buildup and runoff pH
Burnt tips can suggest excess salts, but they aren't a diagnosis. Confirm with a consistent substrate test before changing feed or leaching,…
Grow guide
Silica, mycorrhizae, foliar sprays and boosters: what is actually proven?
Get the basic environment and feeding program right before buying extras. Cannabis and hemp supplement trials exist, but effects depend on the…
Grow guide
Cannabis pH: what the research actually says
Match pH to your medium and measure it the same way every time. Hemp research shows very acidic substrate can slow growth,…