Nobody kills their first plant with bad genetics or a cheap tent. They drown it. Watering is the one daily skill in growing — get it right and everything else gets easier.
The golden rule: water by weight, not by schedule
Plants don't drink on a calendar. Lift the pot:
- Feather light → water today
- Noticeably heavy → wait
- Learn the difference by lifting right after watering and again two days later. Your arms become the moisture meter
Signs you're getting it wrong: droopy leaves with wet soil = overwatered (roots suffocating). Droopy with bone-dry soil = underwatered. Same droop, opposite fixes — always check the soil before you pour. For a deeper dive on diagnosing watering problems, see the overwatering/underwatering guide.
How much, when you do water
Water slowly until 10–20% runs out the bottom (in amended organic soil, aim lower — just a trickle — to avoid washing out nutrition). Then stop. Small sips every day keep the top wet and the bottom dry — roots chase water, so deep, less-frequent watering builds deep roots.
Wet-dry cycling is the engine of growth. Roots need oxygen between drinks. In fabric pots this rhythm is almost automatic; in plastic, be patient.
Watering by growth stage
| Stage | Frequency | Volume |
|---|---|---|
| Seedling | Every 2–3 days | 30–60 ml, ring around stem |
| Early veg | Every 2 days | Until light runoff |
| Late veg | Daily or every other day | 10–20% runoff |
| Flower | Daily in coco; every 2 days soil | 10–20% runoff |
These are starting points — pot size, medium, temperature, humidity, and plant size all shift the schedule. The lift test always overrides the table.
pH: the invisible gatekeeper
Nutrients only dissolve into a plant-usable form inside a narrow pH window. Outside it, food is in the soil but the plant physically can't take it — the dreaded lockout that looks like a deficiency and gets worse the more you feed.
| Medium | Target pH |
|---|---|
| Soil | 6.0–6.8 |
| Coco / hydro | 5.5–6.1 |
The routine (30 seconds):
- Fill your watering jug, add any nutrients first
- Stick in the pH pen
- Adjust with a few drops of pH-Down (usually) or pH-Up
- Stir, re-check, pour
Buffered exception: quality amended living soils resist pH swings — many living-soil growers never adjust. Tap water at 7.0–7.5 into good soil is usually fine. Coco and bottled-nutrient growers get no such pass: pH every time.
For a complete pH walkthrough, see pH for beginners. For lockout recovery, see nutrient lockout recovery.
Water quality quick hits
- Tap water: usually fine. Let it sit a few hours (or overnight) so chlorine gases off — chloramine doesn't gas off, but at tap levels it's rarely a real problem
- Softened water: avoid — the sodium accumulates
- Very hard water (300+ ppm): consider RO or mixing with distilled; then add Cal-Mag back
- Cold water shocks roots. Room temperature, always
Reading runoff
The water that drains from the bottom of your pot tells you what's happening in the root zone:
- Runoff pH much lower than input — salt buildup is acidifying the medium. Flush with 2–3x pot volume of pH'd water
- Runoff pH much higher than input — the medium is buffering up (limestone, degrading organics). Normal in fresh soil; concerning in week 6+
- Runoff EC/PPM climbing — nutrients are accumulating. Give plain water for the next watering
You don't need to check runoff every watering — once a week is plenty for soil. Coco and hydro growers benefit from more frequent monitoring.
The 10-second daily check
Lift the pot. Look at the leaves. Glance at the hygrometer. That's the whole job — three data points a day and you'll catch every problem a week before it gets serious.
If something looks wrong, start with pH and watering before adding nutrients. See the nutrient deficiency chart — most "deficiency" symptoms are actually pH lockout or watering issues in disguise.