pH Diagnostic
BetaCheck if your water pH matches your substrate and get instant correction recommendations.
BetaThese tools are built from our own experience and deep research. We're actively testing and improving them in real conditions. Got feedback or ideas to make them even better? We'd love to hear from you!
pH optimal
Perfect! Your pH is in the optimal range for soil. All essential nutrients are available to your plants. Keep it up!
Optimal Range
6–7pH
Ideal Value
6.5pH
Current pH
6.5pH
Substrate
Soil
pH Value in Cannabis Growing – Why It Matters So Much
The pH of your watering solution is one of the most important factors in cannabis cultivation. It determines which nutrients your plant can absorb and which remain 'locked out' in the substrate. Our free pH diagnostic tool instantly shows you whether your pH is in the optimal range – tailored to your substrate.
Different substrates require different pH ranges: soil prefers a slightly acidic pH of 6.0–7.0, while coco and hydroponics need a range of 5.5–6.5. Outside these ranges, nutrients like iron, calcium, or phosphorus cannot be absorbed – even if they're present in the nutrient solution.
The most common cause of deficiency symptoms in home growing isn't missing fertilizer, but incorrect pH. Yellow leaves, brown spots, or stunted flowers are often signs of pH-related nutrient lockout. Regular pH checks before each watering reliably prevent these problems.
We recommend using a digital pH meter that you calibrate regularly. For correction, pH Up (potassium hydroxide-based) and pH Down (phosphoric acid) are available. Always adjust the value slowly and measure again after 15 minutes. This prevents pH fluctuations that can stress your plants.
Frequently Asked Questions About pH in Cannabis Growing
Healthy Plants Start with the Right pH
Start with our premium clones and the knowledge of optimal pH values for your next grow project.
Our Most Popular Clones
