A cannabis nutrient schedule example is useful because it gives you a starting point, not because every plant should receive the same bottle cap measurement every week. Plant size, cultivar, light intensity, container volume, water quality, and growing medium all change how much nutrition a crop can use. The goal is to supply a complete feed at a strength the roots can handle, then adjust from what the plant and root zone are telling you.
A feeding program works best when the base nutrient, pH range, irrigation frequency, and environmental conditions are working together. Raising nutrient strength to compensate for weak lighting, cold roots, poor drainage, or inconsistent watering usually creates a larger problem. Start conservatively, keep records, and increase only when healthy plants are actively growing and using the solution.
Cannabis Nutrient Schedule Example at a Glance
This example uses EC rather than only milliliters per gallon. EC measures the total conductivity of the nutrient solution, which makes it more useful when your source water already contains minerals. If you use parts per million, remember that PPM conversion scales vary by meter. EC is the cleaner reference point.
| Growth stage | Typical duration | Target EC | Main feeding focus | |—|—:|—:|—| | Rooted clone or seedling | 1-2 weeks | 0.4-0.8 | Gentle base nutrition and root development | | Early vegetative growth | 2-3 weeks | 0.8-1.2 | Balanced growth, leaf and root expansion | | Established vegetative growth | 2-4 weeks | 1.2-1.6 | Steady nitrogen, calcium, magnesium, and micronutrients | | Transition or stretch | 1-2 weeks | 1.4-1.8 | Complete nutrition with a gradual shift toward bloom support | | Early flowering | 2-3 weeks | 1.6-2.0 | Controlled nitrogen and increased potassium demand | | Mid flowering | 3-5 weeks | 1.8-2.2 | Consistent bloom nutrition and stable root-zone conditions | | Late flowering | Final 1-2 weeks before finish | 1.2-1.8 | Maintain plant health without forcing excess feed |
These ranges are not a challenge to reach. A smaller plant under moderate light may perform better at the low end, while a large, healthy plant in a well-managed hydroponic system may use more. If leaf tips burn, the media EC climbs, or plants drink slowly, reduce strength before adding more products.
Start With Your Water and Growing Medium
Before mixing nutrients, test the EC of your starting water. Water with an EC of 0.1 is very different from water that starts at 0.6. The schedule targets above refer to the final mixed solution, including the minerals already present in the water. Hard water may also contain enough calcium and magnesium that a separate Cal-Mag product is unnecessary or needs to be used lightly.
For cannabis in soil, keep the feed solution generally around pH 6.2 to 6.7. Coco coir and most hydroponic systems usually run best around pH 5.7 to 6.1. Letting pH move slightly within those ranges can help with overall nutrient availability, but major swings make diagnosing deficiencies much harder.
Soil grows require more restraint than recirculating hydroponics. Soil retains nutrition and can build up salts if every watering is a heavy feed. Coco is usually managed with more frequent nutrient solution applications and enough runoff to limit accumulation. In deep water culture or other reservoir systems, measure EC and pH daily because roots have direct and continuous access to the solution.
Weeks 1-2: Rooted Clones and Seedlings
Young plants need a light feed, not plain water indefinitely. Once a seedling has established true leaves or a clone has active roots, begin with a complete base nutrient at roughly 0.4 to 0.8 EC. Use the lower end for small plants, recently transplanted clones, or media that has pre-amended fertility.
A root-support product can fit here, but it should not replace complete nutrition. Roots need nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, and trace elements in balanced amounts. Avoid stacking several additives during this stage. If the plant is pale and growing steadily, raise base nutrition slightly at the next feeding rather than reaching immediately for a separate corrective bottle.
Weeks 3-6: Build a Productive Vegetative Plant
As canopy growth accelerates, move into a vegetative base nutrient program around 0.8 to 1.6 EC. Nitrogen is important at this stage because it supports leaf area and new shoots, but too much can create overly dark foliage, soft growth, and a plant that is difficult to steer once flowering begins.
Calcium and magnesium deserve attention under strong LED fixtures, in coco, and with reverse-osmosis water. Calcium supports new tissue and root function, while magnesium is central to chlorophyll production. A complete nutrient line may already provide adequate amounts, so check the feeding chart before automatically adding more. Excess calcium can interfere with potassium and magnesium uptake.
Keep irrigation consistent. A plant that alternates between dry stress and heavy saturation may show nutrient symptoms even when the mixed solution is correct. In containers, lift pots or monitor media moisture so you learn how quickly plants are actually using water.
Transition: Change the Ratio Gradually
The first one to two weeks after changing the light cycle can bring fast growth. This is where many growers cut nitrogen too sharply or push bloom boosters too early. The plant is still building stems, leaves, and roots while beginning reproductive development, so it needs a complete formula rather than a high-phosphorus shortcut.
Run a transition feed around 1.4 to 1.8 EC, depending on plant size and system. Shift gradually from a vegetative formula toward a bloom formula according to the nutrient manufacturer’s directions. A quality base nutrient program such as Bionova is designed to provide the macro and micronutrient foundation; additives should support that foundation, not complicate it.
Early and Mid Flower: Keep the Root Zone Stable
Early flower commonly runs around 1.6 to 2.0 EC, with healthy established plants sometimes moving toward 2.2 EC in mid flower. Potassium demand becomes more significant as flowers develop, but a balanced bloom nutrient still needs sufficient nitrogen, calcium, magnesium, sulfur, and micronutrients.
This is the stage to judge your program by plant response and runoff or reservoir readings. In coco, a runoff EC that continually rises above the input EC points to salt accumulation, insufficient runoff, or an overly strong feed. In a reservoir, falling EC paired with stable pH can indicate that plants are consuming nutrients. Rising EC may mean plants are taking up water faster than minerals, often a reason to lower solution strength.
Do not treat every yellow leaf as a deficiency. Lower leaves can naturally fade as plants age, while yellowing at new growth may point to pH, root health, calcium, iron, or micronutrient availability. Check the simplest causes first: meter calibration, solution EC, pH, temperature, and watering practices.
Late Flower: Avoid Chasing a Dark Green Finish
Late flowering calls for observation, not automatic escalation. If the canopy remains healthy and the root zone is stable, many growers gradually reduce EC to roughly 1.2 to 1.8 as plants approach their planned finish. The exact timing depends on cultivar, container size, media, and whether the plant is still actively drinking.
Avoid excessive nitrogen late in flower. It can keep plants unusually dark green and delay the natural shift in nutrient demand. At the same time, stripping nutrition too early can leave a still-active plant short of essential minerals. Follow the base nutrient program, reduce strength when plant demand declines, and avoid abrupt changes unless you are correcting a verified issue.
A Better Way to Adjust the Schedule
Use one change at a time. If you increase EC, do not also change pH targets, introduce two additives, and alter irrigation frequency. That makes it nearly impossible to identify what helped or harmed the crop.
Keep a simple log of feed EC, pH, runoff EC where applicable, room temperature, and visible plant response. A dependable nutrient schedule is built from those notes over repeated cycles, not from forcing a generic chart onto every cultivar. Start with complete nutrition, maintain a healthy root zone, and let measured plant response determine the next adjustment.
