Leaf Tip Burn in Cannabis: Causes and Prevention
Discover the common causes of leaf tip burn in cannabis and learn how to prevent it.
Nutrient burn in seedlings almost always comes from feeding too early or mixing too strong. The fix is straightforward: start in a light, buffered medium, wait for the first true leaves before introducing nutrients, and raise strength in small steps while watching the leaf tips. A seedling uses a fraction of what a mature plant drinks, so restraint is the whole strategy.
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What Does a Seedling-Safe Feeding Plan Include?
- Start in a mild seed-starter mix or lightly amended soil rather than a heavily fertilized blend.
- Hold off on base nutrients until the first set of true leaves opens.
- Mix at roughly one-quarter of the label's adult strength, then increase weekly.
- Keep water pH steady, around 5.8 to 6.5 depending on your medium, so roots can absorb what they are given.
- Feed in small volumes to runoff, then let the surface dry slightly between waterings.
- Alternate plain pH-adjusted water with feedings to rinse excess salts away from young roots.
- Watch the leaf tips, because a faint brown tip is the earliest warning that the mix is too hot.
Accuracy matters more than brand. Scooping by eye is where most burn starts, so a calibrated pH pen and an inexpensive EC or PPM meter take the guesswork out of every batch. A few oral syringes let you measure nutrient concentrates in milliliters instead of splashes, and a simple log of strength, pH, and runoff lets you trace a problem back to the batch that caused it. Recalibrate meters every couple of weeks and always measure the final diluted mix, never the concentrate.
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How Do You Fix Nutrient Burn Once It Starts?
Stop all feeding and run pH-adjusted plain water through the container until the runoff clears, then let the medium dry back. Resume at half your previous strength only after new, healthy growth appears.
When Should You Start Feeding Seedlings?
Usually one to two weeks after sprouting, once the first true leaves are established and the round cotyledons begin to pale. Before that, plain water is enough.
Nutrient Burn vs. Nitrogen Toxicity in Cannabis: A Comparison Review
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