Nutrient Burn: How to Spot, Fix, and Prevent It

Nutrient burn is one of the most common — and most avoidable — problems in fertigated growing. It shows up as crispy, browning leaf tips, and it’s your plants telling you they’re getting fed too hard. Whether you grow cannabis, greenhouse vegetables, or anything on a nutrient program, here’s how to spot nutrient burn, fix it fast, and keep it from coming back.

What Is Nutrient Burn?

Nutrient burn (or “nute burn”) is damage caused by too high a concentration of nutrient salts in the root zone. When the solution is stronger than the plant can use, salts accumulate and scorch the tissue — starting at the leaf tips, where the plant transpires most. It’s essentially over-fertilization, and it stunts growth and hurts quality if left unchecked.

How to Spot Nutrient Burn

The classic signs, roughly in order of severity:

Yellow, then brown, crispy leaf tips — the hallmark symptom.
Burnt margins creeping inward from the tip along the leaf edge.
Dark green, “clawed” or curled-down leaves — often a sign of nitrogen excess.
Tips that look almost bleached or rusty in heavier cases.

Nutrient burn starts at the tips and moves inward — that pattern is what separates it from a deficiency (which usually starts as discoloration across or between the veins). Penn State Extension’s overview of nutrient function, deficiency, and excess is a useful reference for telling them apart.

Close-up of a cannabis plant with water droplets, lower leaf tips showing yellowing and browning — Watch the tips: nutrient burn starts there — yellowing, then brown and crispy — and creeps inward along the leaf margin.

What Causes It

Cause	What’s happening
Feed too strong	Running the feed chart at full strength when your plants want less
Base-water EC ignored	Dissolved solids in your source water stack on top of what you add
Additive stacking	Piling on boosters and supplements pushes total EC too high
Salt buildup	Not enough runoff, so salts accumulate in the medium over time
Hot root zone	Warm conditions concentrate the solution and stress roots

How to Fix Nutrient Burn

Flush the medium. Run plenty of clean, pH’d water — ideally reverse osmosis — through the pots to wash out excess salts.
Cut your feed strength. Drop back to a lighter dose and check your EC against the target for the stage.
Verify pH. Confirm your water pH is in range so the plant can recover and take up nutrients cleanly.
Wait and watch. Damaged tips won’t heal, but new growth should come in clean once the root zone is back in balance.

How to Prevent It

Start low. Begin at 50–75% of your feed chart and work up while watching the plants.
Measure everything. Check finished-mix EC and read runoff EC — runoff higher than input means salts are building up. Michigan State Extension’s guide to pH and plant nutrition is a good reference.
Start with clean water. A low-EC base makes your feed predictable.
Feed consistently. Swings between too-hot and too-light stress plants; precise, repeatable dosing keeps EC steady.

Burn vs. Lockout vs. Deficiency

Three problems get confused constantly. Nutrient burn is too much — crispy tips from excess salts. Lockout is nutrients present but unavailable, usually from pH being out of range. Deficiency is genuinely too little of a nutrient. The fixes differ, so diagnose before you react: burn calls for a flush and lighter feed, lockout calls for a pH correction, and deficiency calls for more of the missing element.

Nutrient Burn FAQ

Will nutrient-burned leaves recover?

No — damaged tips won’t heal. The goal is to stop the damage so new growth comes in healthy. Flush, lighten the feed, and let the plant rebound.

What EC causes nutrient burn?

There’s no single number — it depends on crop, stage, and genetics. That’s why you read runoff EC and watch the plants rather than chasing a fixed target. Rising runoff EC and tip burn together mean you’re too hot.

Is nutrient burn only a cannabis problem?

Not at all. Any fertigated or hydroponic crop can be over-fertilized. The symptoms and fixes are the same across greenhouse and commercial agriculture.

The Best Fix Is Prevention

Nutrient burn almost always traces back to inconsistent or overly strong feeding. Precise, automated dosing removes the guesswork — the Paragon delivers your recipe to the milliliter across every zone, so EC stays exactly where you want it. That consistency is the foundation of reliable commercial fertigation. Reach out and we’ll help you dial it in.