Cannabis Vegetative Stage DWC Recipe
A precision deep water culture recipe for the cannabis vegetative growth phase, maximizing structural development, root mass, and preparing plants for a productive flowering stage.
The vegetative stage is the foundation of every successful cannabis grow. This DWC recipe is specifically formulated to drive rapid, healthy vegetative growth with strong branching structure, thick stems, and an explosive root system that will support heavy flower production later. Deep water culture is one of the fastest growing methods for cannabis because roots have unlimited access to oxygen-rich nutrient solution 24/7. During the vegetative phase, nitrogen is the primary driver, maintained at elevated levels to fuel leaf and stem development. Calcium and magnesium are also critical, especially under high-intensity LED lighting, which increases the plant's demand for these secondary macronutrients. This recipe covers the entire vegetative period from clone or seedling through the transition to flower. The nutrient schedule gradually ramps up over 4-6 weeks, matching the plant's increasing appetite. Proper vegetative growth management — including topping, training, and defoliation — paired with this nutrient recipe creates a canopy structure optimized for maximum light interception and flower site development.
Voedingsstadia (ppm)
Labels
Unlock Full Recipe
Sign in to access detailed ingredients, instructions, and analysis
Veelgestelde Vragen
How long should cannabis veg in DWC before flipping to flower?
Most DWC cannabis plants need 4-6 weeks of vegetative growth before flipping to flower. The rule of thumb is to flip when the plant fills 50-60% of your intended flower canopy, because cannabis typically doubles in size during the first 2-3 weeks of flower (the stretch). Autoflowers don't require a light flip — they transition automatically after 3-4 weeks.
What EC level should cannabis be at during veg in DWC?
Start seedlings/clones at EC 0.5-0.8 mS/cm and gradually increase to 1.4-1.8 mS/cm by late veg. Cannabis in DWC tends to be more sensitive to high EC than in other media because roots are in constant contact with the solution. If you see leaf tip burn, reduce EC by 0.2-0.3 mS/cm. Different strains have varying tolerances.
Do I need CalMag for cannabis in DWC?
Yes, especially under LED grow lights. LEDs drive higher calcium and magnesium demand compared to HPS lights. Maintain calcium at 150-180 ppm and magnesium at 50-60 ppm during veg. Interveinal chlorosis (yellowing between leaf veins) on newer growth is the classic sign of magnesium deficiency, while brown spots indicate calcium deficiency.
When should I top my cannabis plant in DWC?
Top cannabis once it has developed 4-6 nodes, typically in week 3 of veg. Cut the main stem above the 4th or 5th node — this forces two new main branches and creates a bushier plant with more cola sites. Allow 3-5 days recovery before additional stress. You can top again once the new branches have 3-4 nodes for even more branching.
How often should I change the DWC reservoir for cannabis?
Change the reservoir every 7 days during veg. Between changes, top off with pH-adjusted water (not full-strength nutrients). In late veg, large plants can consume 1+ gallons per day. Monitor EC and pH daily — if EC rises, the plant is drinking more water than nutrients (dilute with water). If EC drops, the plant is hungry (add nutrients).