How often should you water cannabis during flowering?
Water flowering cannabis every 2 to 3 days in soil and every 1 to 2 days in coco coir or hydroponic media. The plant is ready when the top 1 to 2 inches of the medium feels dry and the container feels light. Peak demand hits between weeks 3 and 6 of flower, then drops in the last two weeks as buds ripen.
cannabis watering schedule for flowering stage
Why flowering changes water demand
Buds grow fast in weeks 3 through 6, so the root zone pulls water and nutrients at its highest rate. A plant that drank every 4 days in veg may need water every 2 days in mid-flower. As flower finishes, growth slows and the plant uses less water each day.
cannabis watering schedule coco coir
How to check if your plant needs water
- Lift the pot. A dry container feels much lighter than a soaked one.
- Finger test. Push a finger 1 to 2 inches into the medium. Water if it comes out dry.
- Moisture meter. Read the lower half of the pot, not just the surface.
- Leaf language. A slight droop that firms up after watering means the plant was thirsty.
How much water to give in flower
Pour water in a slow, even circle until 10 to 20 percent of the volume runs out the bottom of the pot. That runoff flushes salt buildup left by flowering nutrients. In a 5-gallon pot, that usually means 1 to 1.5 gallons per feeding.
Water pH and temperature for flowering
Keep soil water between pH 6.0 and 6.8, and coco or hydro between 5.5 and 6.5. Use water between 65 and 72 degrees Fahrenheit to avoid shocking the roots. Cold water slows uptake, and warm water holds less dissolved oxygen.
cannabis watering schedule by week
Should you water less in late flower?
Yes. In the final 10 to 14 days, let the medium dry back more between waterings. A mild dryback lowers the risk of bud rot and can support resin production. Cut volume rather than skipping water.
Signs of overwatering and underwatering
- Overwatered: drooping leaves that stay limp, dark green color, fungus gnats, algae on the surface.
- Underwatered: crisp or curling leaf edges, fast wilting, bone-dry medium, stalled bud growth.
Overwatering is the more common error during flower. Roots need oxygen, so a medium that stays wet for days stalls bud development.
What changes the schedule?
- Pot size. Bigger containers hold water longer.
- Medium. Coco and hydro need more frequent feeds than amended soil.
- Temperature and humidity. Hot, dry rooms speed evaporation.
- Light intensity and airflow. Stronger transpiration means faster dryback.
Quick flowering watering chart
- Weeks 1 to 3: water every 3 to 4 days in soil.
- Weeks 3 to 6: water every 2 to 3 days, peak uptake.
- Weeks 6 to 8: water every 2 to 3 days with lighter volume.
- Final 1 to 2 weeks: water every 3 to 4 days with a longer dryback.