How to Feed Cannabis: A Beginner Feeding Schedule

3 min read

A simple shelf of base cannabis nutrients next to an overloaded shelf of supplements

The Chef treated nutrients like a cooking show — three base bottles, a CalMag, a root stimulator, a bloom booster, a PK booster, a carb supplement and a microbe inoculant, all bought the same day, all used the same day, all at label dose. Tip burn within forty-eight hours. The plant didn’t need seven inputs. It needed the base at half strength and a bit of patience.

The short version:

  • Start at half the label dose. You can always add more; you can’t un-feed
  • Watch the plant, not the bottle — pale and slow means nudge up, burnt tips mean back off
  • One base nutrient (veg + bloom) covers most of it
  • Add CalMag if you’re in coco or on soft water (most of Ireland)
  • Potency comes from genetics, not from feeding harder

Want the full breakdown? Keep scrolling.

What’s the simplest feeding approach?

Pick a base nutrient — something like CANNA Terra Vega in veg and Terra Flores in flower gives you a complete base (DIG stock the range). Start at half the recommended dose. Watch for a week. Growing well, good colour, no hunger? Stay there. Lower leaves paling and growth slowing? Nudge up by 25%. Any burn on the tips at all? Back off. That’s the whole method: half strength, watch, adjust. The label is a guideline written for ideal conditions your tent doesn’t perfectly match — it is not a commandment.

When do I add the extra bottles?

Mostly, you don’t — not for a while. CalMag earns its place if you’re in coco or on soft water (Dublin runs about 50–80ppm from the tap, which is soft). A PK booster can help in mid-flower if the plant is healthy and you want to push the buds — but one product, at half dose, not three stacked on top of each other swinging your pH around. Everything else stays on the shelf until you’ve a few grows behind you and actually know what each bottle does. Stacking additives is how beginners create the very problems they then buy more bottles to fix.

How does feeding change through the grow?

Roughly: light, nitrogen-leaning feed in veg; a bridge feed through the stretch that eases toward bloom; phosphorus and potassium climbing through mid-flower; then winding down to plain or near-plain water at the end. If you measure, veg sits around EC 1.0–1.4 and flower around 1.4–2.0 — rough guides, strain- and medium-dependent. The trend matters more than the number: if runoff EC climbs every feed, salts are stacking up and it’s time for plain pH’d water. And the part worth repeating — feeding harder doesn’t make bud stronger. An 18% strain fed to the gills is still 18%. Potency is genetics.

FAQ

How much should I feed a cannabis plant? Start at half the label dose and adjust from there. Most growers never need to go to full strength, and underfeeding is far easier to fix than nutrient burn.

Do I need all those supplement bottles? No. A base nutrient (plus CalMag in coco or on soft water) covers most grows. Add extras one at a time, at half dose, only once you understand them.

Does feeding more increase potency? No. Potency is set by genetics. Overfeeding just burns tips, builds salt in the root zone and wastes money.

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