Overfertilization

Over-fertilization (also known as nutrient burn) occurs when a plant receives more nutrients than it can process. It is one of the most common beginner mistakes – usually stemming from the well-intentioned reflex that more is better. In reality, too much fertilizer is often more harmful than too little.

Symptoms of Over-fertilization

The classic signs are burnt-looking, brown or yellow leaf tips that spread inwards. This is often accompanied by very dark, almost claw-like downward-curved leaves ("clawing") and an overall overly rich green color. Important: Burnt leaf tips can also have other causes – the overall picture and fertilization history help with classification.

Causes and Countermeasures

The most common causes are excessive dosing, a too high EC value, or an accumulation of salts in the substrate. This can usually be remedied by "flushing" with clear, pH-corrected water and subsequently reduced fertilization. It is also worth checking the pH value, as nutrient problems often interact. It is better to fertilize cautiously and observe than to have to repair afterward.

Frequent Questions about Over-fertilization

How do I recognize over-fertilization?

By burnt, brown leaf tips, very dark green, and downward-curled leaves. The overall picture counts.

What to do in case of nutrient burn?

Flush with clear, pH-corrected water and then fertilize less. Affected leaves usually do not recover, but new ones grow healthily.

Is too little fertilizer better than too much?

Tends to be yes. Under-fertilization is easier to correct than nutrient burn. Cautious approach is the safer strategy.