No news peg here, and we are not inventing one. The FoxFarm Liquid Trio — Grow Big, Tiger Bloom, Big Bloom — is a standing catalogue product that has sat on the same shelf for years, and the reason to write about it now is the reason to write about seed stock in February: somebody is planning a grow and deciding what to put on the shelf before it starts. This is a reading of the manufacturer’s published guaranteed analyses and dosing copy, taken from FoxFarm’s own product pages, not from a retailer’s listing and not from a bench.
Nothing was mixed or measured here. Every figure below is FoxFarm’s.
What the three bottles publish
Two fertilisers and an amendment
Read the analyses side by side and the program explains itself. Grow Big at 6-4-4 is the nitrogen-forward bottle you feed while the plant is building structure. Tiger Bloom at 2-8-4 flips the ratio toward phosphorus — FoxFarm’s own copy calls it “a phosphorus fertilizer that contains nitrogen” — and it comes in at the first signs of flowering and stays until harvest. That is a legible, two-step arc, and legibility is worth something to a first-time grower.
The third bottle is the one worth arguing about. Big Bloom publishes 0-0.5-0.7. It sits in the same pack and is dosed at every watering, but its printed analysis lists no nitrogen and well under one percent phosphate and potash. That does not make it inert, and we are not going to say it does: it is a guano-and-castings input, FoxFarm describes it as gentle enough for all stages, and it carries OMRI listing and CDFA Organic Input Material registration that we did not find on the other two product pages we read. Worth reading that status precisely. Listing an input material is not certification of your finished crop, and it is not an approval of any particular plant for any particular purpose.
But if you are buying the Trio expecting three fertilisers, you are buying two. The third is a soil amendment packed like a feed.
The dosing problem, which is real
Here is the fault a buyer actually trips over. The Tiger Bloom product page gives home-scale rates: general feeding 2 to 3 teaspoons, 10 to 15 mL, per gallon every other watering; heavy feeding 4 teaspoons, 20 mL, per gallon; recirculating systems 2 teaspoons per gallon per reservoir change; foliar half a teaspoon per gallon every other week. Sizes run Pint through 250 Gallon. That is written for a person with a watering can.
Land on FoxFarm’s commercial listings for the other two and the arithmetic changes underneath you. The Grow Big page we read is the Commercial one, and its rates are per hundred gallons — 33 to 50 fluid ounces per 100 gallons general, 67 fluid ounces heavy — with available sizes starting at 5 Gallon. Big Bloom’s commercial page does the same: 200 fluid ounces per 100 gallons every other watering, 400 fluid ounces per 100 gallons once a week for heavy feeding. Those are not home-scale numbers, and we will not convert them for you: a converted rate is a rate nobody published.
So the same three-bottle program is documented at two different scales on the same domain, and which page a search drops you on decides what units you are told to mix in. Find the consumer label for the bottle in your hand and dose off that. This is the same habit we argued for when reading two Spider Farmer spec ladders that disagreed with themselves on the deciding number: read the paperwork attached to the exact SKU, not the paperwork attached to the brand.
Verdict
Buy it for Grow Big and Tiger Bloom, which do the work and say plainly when each one starts. Treat Big Bloom as what its label says it is — a mild guano-and-castings amendment — and let that set your expectations rather than the fact that it shares a box with two fertilisers. If you are already running FoxFarm soils, the program is coherent. If you are not, note that the maker’s own instruction is to pair it with FoxFarm’s own products, and price the whole system rather than the pack.
One more thing, and it is not about fertiliser. Nutrients are not the legal question; the plant is. Settle whether a home grow is lawful where you live before you settle which bottles hang over it.