How can I tell when my plant wants more food?

A stalled plant usually isn't a hungry plant. She takes up food about as fast as her light, her room and her roots let her grow, so a stronger mix can't push growth that something else is holding back. She's likely asking for more when the lower leaves fade first and the yellow climbs, the new growth still looks clean, and your pH and runoff check out.

Food doesn't push growth. Growth pulls food.

Why feeding harder backfires

Food she can't use doesn't disappear. In soil it builds up as mineral salt around the roots, and as that salt climbs it gets harder for the roots to pull in water. So an overfed plant can sit in wet soil and still act thirsty. She can droop and yellow, and from across the room that can look a lot like hunger.

That's the trap in one move. She looks hungry, you feed stronger, the root zone gets saltier, and the stall gets deeper.

Feed charts are usually written for big plants under strong light in ideal conditions, so a lot of home tents run comfortably under the chart. Feed the plant in front of you, not the label.

Hungry, or buried? Read the pattern

• Whole plant pale, small and slow, but not fading from the bottom up: usually low light, cool temps or wet roots before it's hunger.

• Lower leaves yellowing first and climbing, new growth still decent: this one can go either way. If pH and runoff check out, it's likely genuine hunger, usually nitrogen in veg or early flower. If they don't, it's lockout wearing the same face.

• Burnt tips, dark clawing leaves, a very deep green: that's too much feed, not too little. She's asking for less.

The order to run before you mix a stronger batch

1. Read the plant. The pattern above tells you which direction you're even going.

2. Check the light and the room, because they set her appetite. A good lane is roughly 75 to 82 degrees with the lights on and a little cooler at night, humidity around 55 to 70 percent in veg and 45 to 60 in flower, and light around 300 to 600 PPFD in veg and 600 to 900 in flower. Cold, dim or heat stressed gets fixed before you feed.

3. Check watering and roots. Roots that can't breathe can't feed. Let the pot dry back until it feels noticeably lighter. Healthy roots are white to tan and smell earthy.

4. Check pH, then set runoff EC next to what you fed. Input pH roughly 6.2 to 6.8 in soil, 5.8 to 6.2 in coco. Out of range pH gets corrected first, not the dose. In soil, runoff commonly reads a little above input, so read the gap, not the number alone. Runoff well above input, with tip burn or a gap that keeps growing, means salt is building, so water it back toward range before you feed. Runoff close to input, pH in range, and a lower leaf fade that's climbing means she's likely hungry.

5. Only then, feed a little more. Not double, not full chart tomorrow. Go up about 0.2 EC, roughly 10 to 15 percent, and watch the next few days. Judge her by the new growth, not the leaves that already yellowed.

Starting lanes, not laser targets (they shift with light, plant size and strain):

• Seedlings: EC, roughly: 0.4 to 0.8; PPM on a 500 scale meter, roughly: 200 to 400

• Veg: EC, roughly: 0.8 to 1.4; PPM on a 500 scale meter, roughly: 400 to 700

• Flower: EC, roughly: 1.2 to 1.8; PPM on a 500 scale meter, roughly: 600 to 900

If you already fed harder

Think about turning up a speaker. A little louder sounds great. Past a certain point you don't get more music, you get distortion. Burnt tips and claw are the distortion, and the answer to distortion is never to turn it up.

So stop adding nutrients. Give her plain, properly pH'd water or a very light feed for the next watering or two and let her draw down what's already there. Water evenly, and don't water again until the pot has dried back.

If runoff comes back far above what you fed, or the pH is badly off, a light flush can help: one slow watering of plain, room temperature, pH'd water with a bit more runoff than usual, then let it drain and dry back fully. Don't blast gallons of cold water through and leave her waterlogged for a week. That shocks roots that are already sitting in salt.

Once the new growth looks cleaner, restart feeding low, around a quarter to half strength. The burnt tips won't heal. Judge her by the new growth.

What not to do

Don't jump a rung on the feed chart to catch up. If she stalled for a reason that isn't food, a stronger mix adds salt to the problem you already have.

Don't feed pale tops right under the light. Bleaching is damage, not hunger. See Tacoing or bleached tops: is my light too close?

When it's something else

• Yellow leaves and you're not sure it's hunger: see Yellow leaves: is it a deficiency, and is this too much?

• A runoff number that scared you: see My runoff number is high. Should I flush?

• Drooping in a heavy pot: see How often should I water, and why is she drooping?

On our shelf in Worcester: pH and EC meters are in pH, water & meters, and the nutrient lines are on the Nutrients wall.

Keep going

Watch the episode: Stalled Plant? Why Feeding More Makes It Worse on MyRemy Live.

Most growers don't need more bottles. They need a stable baseline they can actually read. The whole system is written down in the free Stability Playbook. Get the free Stability Playbook