Fox Farm Nutrient Schedule for Autoflowers (Complete Feeding Guide)

Nutrients
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Fox Farm Nutrient Schedule for Autoflowers (Complete Feeding Guide)

Growing autoflowers with Fox Farm nutrients can produce great results, but the standard feeding charts are often too strong for autos.

Here’s a simple, safe approach based on real grower experience.

Quick answer

Autoflowers should be fed at 25–50% of the Fox Farm recommended strength, starting around week 2–3. Most growers use Grow Big during veg, then transition to Tiger Bloom in flowering, adjusting based on how the plant responds.

The key is to start light and increase gradually—autos don’t recover well from overfeeding.

Simple autoflower feeding schedule (Fox Farm Trio)

Weeks 1–2 (seedling stage)

  • No nutrients (or very light feeding)

  • Focus on root development

  • Use plain water

Weeks 3–4 (early vegetative stage)

  • Start Grow Big + Big Bloom

  • Use 25–50% strength

  • Feed lightly and monitor plant response

Weeks 5–6 (pre-flower)

  • Reduce Grow Big slightly

  • Introduce Tiger Bloom

  • Keep feeding at reduced strength

Weeks 7–10 (flowering stage)

  • Use Tiger Bloom + Big Bloom

  • Maintain moderate feeding

  • Watch closely for nutrient burn

Final 1–2 weeks (pre-harvest)

  • Reduce or stop nutrients

  • Flush if needed (optional)

Key tips for autoflowers

  • Start at half strength or less

  • Autos are more sensitive than photoperiod plants

  • It’s easier to increase nutrients than to fix burn

  • Adjust based on your plant, not a chart

Common mistakes

  • Following Fox Farm charts at full strength

  • Feeding too early

  • Not adjusting for autoflowers

  • Ignoring signs like burnt tips or dark green leaves

How to know if you’re feeding correctly

Healthy signs

  • Steady growth

  • Vibrant green leaves

  • No burnt tips

Overfeeding signs

  • Leaf tip burn

  • Dark, clawing leaves

Underfeeding signs

  • Pale leaves

  • Slow growth

Feeding and watering

Nutrients and watering go hand in hand.

If you’re unsure how often to water, see this thread:
https://ilgmforum.com/t/watering-schedule-and-quantity/111650

What growers actually do

There’s no single “correct” schedule. Some growers run as low as 25% strength the entire grow, while others increase feeding gradually depending on strain, medium, and environment.

Factors like soil type, pot size, lighting intensity, and genetics all influence how much your plant can handle.

Real grower experiences

Every setup is different, and seeing how others approach feeding can be helpful.

You can follow the discussion here:
https://ilgmforum.com/t/fox-farms-nutrient-schedule-for-autos/39917

Your setup

If you’re running Fox Farm nutrients with autoflowers, it helps to include:

  • Strain

  • Medium (soil, coco, etc.)

  • Pot size

  • Feeding strength you’re using

This makes it easier for others to compare and give useful feedback.

Final takeaway

There’s no perfect schedule, but most growers succeed by:

  • Starting light

  • Watching the plant

  • Adjusting gradually

Treat the Fox Farm schedule as a guideline, not a rule.

What strength are you currently feeding your autos at, and how are they responding?

And please feel free to chime in with your preferred fertilizer products and/or additives!

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Nice read @Olaf.ILGM. I see a lot of new growers using the FF nutrients as well as myself when I started. After several runs I found this nutrient line to be salt heavy and without a consistent feeding routine with alternating a water feed in between and liberal run off created root zone issues. I switched to Jacks 321 for simplicity and consistency, 2 years ago I switched to Mega Crop 1 part and have been pleasantly pleased with the growth results. It’s loaded with all the required macro/micro nutrients and very inexpensive compared to others :love_you_gesture:

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Thanks so much for chiming in with feedback and your own experience. That’s very helpful info. This is the exact kind input I was looking for!