FoxFarm Feeding Schedule: The Grow Big, Big Bloom & Tiger Bloom Chart Explained
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FoxFarm Feeding Schedule: The Grow Big, Big Bloom & Tiger Bloom Chart Explained
FoxFarm's liquid trio, Grow Big, Big Bloom, and Tiger Bloom, is one of the most recognized nutrient lines in home cultivation, and it's also one of the heaviest-feeding schedules we carry. The official 12-week soil chart doses in teaspoons per gallon rather than milliliters, climbs to some of the highest PPM targets of any line on this site, and explicitly tells you to feed up to twice a week. Here's the real chart, straight from FoxFarm's own published schedule, plus what that heavier feeding actually means for your plants and your wallet. We don't upsell.
The 30-Second Answer
- Grow Big runs hardest early, 6 tsp per gallon through weeks 1-4, then tapers to 3 tsp per gallon from week 5 through the end of flower.
- Big Bloom peaks at 2 tsp per gallon from week 2 through week 6, drops to 1 tsp in week 7, then stops entirely from week 8 on.
- Tiger Bloom stays flat at 1 tsp per gallon for the entire 12-week cycle, growth and bloom alike.
- This chart runs hot. FoxFarm's own numbers put week 9 PPM at 2,380 to 2,660, well above what most other lines on this site target, and it's common in growing communities to run the chart lighter than published.
We stock the full trio in both single gallons and a starter bundle, and can walk you through which strength actually makes sense for your setup. We don't upsell.
The official FoxFarm soil feeding schedule
This is FoxFarm's own published dosing from their official Soil Feeding Schedule, given in teaspoons per gallon of water, along with the light schedule and target pH range that go with each stage.
Two things stand out next to every other feed chart on this site. First, the units: FoxFarm doses by the teaspoon, not the milliliter, so if you're used to a metric line like CYCO or Canna, the numbers will look unusually large at a glance even though the actual nutrient concentration is calibrated for FoxFarm's own formulation. Second, the PPM range: a week 9 target of 2,380 to 2,660 PPM sits well above what a typical two-part hydroponic base asks for at peak bloom. That's not a mistake on FoxFarm's part, their formulas are built around organic and semi-organic inputs that plants use less efficiently than a fully synthetic salt blend, so the label dose runs heavier to compensate.
What one bottle of each actually gets you
Because the trio doses so differently from each other, the same size bottle lasts very different amounts of time. A quart of Grow Big, run at the week 1-4 rate of 6 tsp per gallon, makes roughly 32 gallons of feeding solution before it's empty. Big Bloom, peaking at 2 tsp per gallon, stretches a quart to about 96 gallons. Tiger Bloom, flat at 1 tsp per gallon for all 12 weeks, is the most economical of the three per bottle, a single quart makes close to 192 gallons of feed. That's the practical version of "Grow Big is the heaviest feeder": you'll restock it fastest, and Tiger Bloom last.
Soil trio pack or full gallons
FoxFarm sells the three products bundled as a soil formula trio, one quart of each in a single pack, and also as standalone gallon and multi-gallon concentrates. The trio pack is the cheaper way to find out whether this line works for your setup, since you're buying a working quantity of all three at once instead of three separate full-size jugs you may not finish. Once you know you're sticking with FoxFarm for a full season, the individual gallon sizes bring the per-ounce cost down, particularly for Grow Big, which you'll go through fastest given how heavy the early-cycle dose runs.
One more label detail worth knowing before you order: FoxFarm sells a separate HYDRO-labeled version of Grow Big for recirculating and hydroponic systems, distinct from the soil-labeled version this chart is built around. If you're growing in soil or soil-like coco, the soil-labeled bottle is the one that matches every number above.
The optional soluble boosters
Beyond the liquid trio, FoxFarm sells a separate line of soluble powder boosters that layer on top of the base chart rather than replacing any part of it. Open Sesame is a bloom-transition booster meant for the first one to two weeks of flowering, when the plant is shifting out of vegetative growth. Beastie Bloomz follows it through the middle of bloom to support flower development. Cha Ching is the late-flower finisher, used in the final weeks before harvest. FoxFarm also sells these three bundled as a soluble trio pack, mirroring the liquid trio's bundle-versus-individual structure.
None of the three boosters are required to get a result from the base Grow Big, Big Bloom, and Tiger Bloom chart above, they're additive, not a replacement for it, and FoxFarm's own liquid trio chart already gets you through a full cycle without them. Where they matter most is for growers chasing a specific outcome, denser flower structure, a longer finish window, a particular aroma profile, rather than as a baseline requirement for every grow. Treat them the way you'd treat any booster line: worth trying once you've got the base chart dialed in and repeatable, not something to add on your first run while you're still learning how the base three respond in your own space.
Shop the FoxFarm trio
Where FoxFarm fits next to the other lines we carry
If you've run a two-part synthetic base before, whether that's Canna Coco, GH FloraPro, or Advanced Nutrients, FoxFarm will feel different in two ways beyond the unit change. The dosing is heavier by design, and the ingredients themselves behave differently in the root zone, since FoxFarm leans on fish, worm castings, and other organic inputs rather than fully soluble mineral salts. That means the PPM numbers on FoxFarm's own chart aren't directly comparable to the PPM target on a synthetic line's chart, higher FoxFarm PPM doesn't mean a hotter feed in the way it would with a fully synthetic base, but it does mean you should treat FoxFarm's schedule as its own system rather than assuming a dose that worked on another brand will translate directly.
That's also why the half-strength approach is so common among first-time FoxFarm growers. Starting light and watching leaf tips for the first sign of nutrient burn costs you very little, since you can always add more at the next feeding, while overshooting can set a plant back for a week or more while it recovers. If you're moving to FoxFarm from a lighter-feeding line, that adjustment period is normal, not a sign anything's wrong with your setup.
What We'd Tell You at the Counter
If this is your first run with FoxFarm, start at half strength for the first one or two feedings, watch your leaf tips, and work up toward the full chart from there rather than starting at 6 tsp per gallon on week one. Grab the soil trio pack if you're testing the line, and switch to individual gallons once you know it's working for your setup, since you'll burn through Grow Big fastest. And double check the label before you order Grow Big specifically: soil-labeled and HYDRO-labeled versions exist side by side, and only the soil version matches this chart. We carry both, and we're glad to help you pick the right one. We don't upsell.
Frequently asked questions
What is the FoxFarm feeding schedule?
FoxFarm's official soil schedule runs Grow Big at 6 tsp per gallon through week 4, tapering to 3 tsp per gallon from week 5 through week 12. Big Bloom peaks at 2 tsp per gallon from week 2 through week 6, drops to 1 tsp in week 7, and stops by week 8. Tiger Bloom stays flat at 1 tsp per gallon for the full 12-week cycle. FoxFarm's own guidance is to feed up to twice per week.
Do I need to feed FoxFarm at full strength?
FoxFarm's published chart is the full-strength version. It's common in growing communities to start at half to three-quarters strength, particularly for new growers, smaller containers, or sensitive strains, and increase from there based on how the plant responds. That's grower-reported practice rather than FoxFarm's own instruction.
What's the difference between Grow Big, Big Bloom, and Tiger Bloom?
Grow Big is the vegetative-stage nitrogen driver and the heaviest-dosed of the three. Big Bloom is a bloom-transition and root-support product used during the middle of the cycle, dosed lighter than Grow Big. Tiger Bloom is the flowering-phase phosphorus and potassium product, dosed flat and lightest of the three across the entire cycle.
Should I buy the trio pack or individual gallons?
The trio pack bundles one quart of each product and is the cheaper way to test whether the full line suits your setup. Individual gallon or multi-gallon jugs bring the per-ounce cost down for growers who already know they'll run FoxFarm for a full season, especially for Grow Big, which gets used up fastest given its heavier early-cycle dose.
What pH and PPM should I target with FoxFarm?
FoxFarm's own schedule targets a pH range of 5.6 to 6.8 throughout the cycle, with PPM climbing from roughly 700-840 in week 1 to 2,380-2,660 by week 9. That PPM range runs higher than most fully synthetic lines, which reflects FoxFarm's organic-leaning ingredients rather than a heavier actual feed in practice.
Whether you're running the trio at full strength or easing into it, the full FoxFarm line and the meters to track your pH and PPM live in the Modern Farms catalog. Because, as always, we don't upsell.
For informational and educational purposes only. Dosing shown reflects FoxFarm's officially published Soil Feeding Schedule at time of writing; always confirm current rates against the product label, since manufacturers periodically update formulations and instructions. Product names, pricing, and specifications reflect our current catalog and are subject to change.