A beginner cannabis nutrient schedule is straightforward: give plain water for the first one to two weeks of a seedling or clone, feed a mild base nutrient at roughly half the label strength during vegetative growth, increase the dose as flowering starts, and stop feeding one to two weeks before harvest. Feed about every other watering rather than every time you water, and always check pH after mixing. Most beginners fail by feeding too much, not too little.
What does a week-by-week schedule look like?
Exact doses vary by brand, so treat this as a framework and follow the bottle for amounts.
Cannabis Nutrient PPM Schedule
- Weeks 1-2 (seedling or clone): plain water only, or a quarter-strength root-focused feed if the plant looks pale.
- Weeks 3-4 (early veg): half-strength base nutrients, fed every other watering.
- Weeks 5-6 (late veg): full label strength base nutrients, plus a calcium and magnesium supplement if using coco or filtered water.
- Weeks 7-9 (early to mid flower): full strength base nutrients, shifting toward the bloom formula.
- Weeks 10-12 (late flower): reduce nitrogen, keep phosphorus and potassium steady.
- Final 10-14 days: plain pH-adjusted water only.
What nutrients does cannabis actually need?
Cannabis needs the same core elements as most leafy crops, plus a few extras that matter during bloom. Nitrogen drives leafy growth, phosphorus and potassium support bud development, and calcium, magnesium, and trace minerals keep the plant from stalling.
cannabis nutrients schedule for hydroponics
- Vegetative stage: higher nitrogen, moderate phosphorus and potassium.
- Flowering stage: lower nitrogen, higher phosphorus and potassium.
- All stages: calcium, magnesium, iron, zinc, and other micronutrients, usually included in a quality base line.
How often should you feed cannabis plants?
A safe beginner pattern is feed, water, feed, water, so the plant gets a plain-water break between nutrient doses. In soil, feeding every other watering limits salt buildup and makes nutrient burn easier to correct. In coco or hydroponics, growers often feed every watering at a lower concentration instead.
The Best Cannabis Nutrient Line Schedule Comparison
What pH should your nutrient water be?
Nutrients only work if the pH lets the roots absorb them. Aim for 6.0 to 7.0 in soil and 5.5 to 6.5 in coco or hydro, and measure after adding nutrients rather than before, since concentrates shift the reading.
How much should a beginner feed?
Start at one-quarter to one-half of the manufacturer's recommended dose and raise it slowly over several waterings. Nutrient companies publish schedules for fast-growing plants, so the printed maximum is often more than a home grow needs. Watch the leaf tips: a slight burn means back off.
Common beginner mistakes to avoid
- Feeding every single watering and letting salts accumulate.
- Adding nutrients before checking pH, then wondering why leaves yellow.
- Mixing supplements in the wrong order, which can lock out calcium.
- Jumping straight to full strength from the first feed.
- Skipping the pre-harvest flush and ending up with a harsh taste.
Do autoflowers need a different nutrient schedule?
Yes, autoflowering plants usually want lighter doses and reach bloom earlier. Many growers start bloom nutrients around week three or four instead of week seven, and rarely exceed three-quarters of the label strength at any point.
When should you flush before harvest?
Flush with plain pH-balanced water for the last 10 to 14 days, giving enough runoff to wash residual salts from the medium. Plants often fade in color during this window, which is normal and not a nutrient deficiency.