FoxFarm and Bloom
FoxFarm on the left, Bloom on the right, matched on the job each bottle does. Your FoxFarm soil and base stay. Here’s where Bloom runs alongside, and where it carries on after theirs stop.
Last checked 5 November 2026 · Public information only
This Fit Report is a summary of publicly available information about FoxFarm and its products, taken from their own website, labels and published material as of 5 November 2026. We’ve linked each source so you can check it yourself. Rates are as printed on each company’s own pages; we don’t show prices. It isn’t affiliated with, endorsed by or approved by FoxFarm, and product names belong to their owners. Products, rates and claims change, so please confirm current details with the manufacturer before making any decision. Spotted something out of date? Email nathan@bloomyellowbottles.com and we’ll correct it.
Their tonics stop at the buds, ours run to the flush.
Kelp Me Kelp You stops at the first sign of buds and Wholly Mackerel at early fruiting, both every other week. Bloom’s Seaweed runs weekly from seedling through the flush, and Seafuel into late flower. Add a liquid humic and a silica, neither on FoxFarm’s liquid list, and that’s the clearest fit.
- Stays as is: your FoxFarm soil or coco, the liquid trio or Cultivation Nation 3-part, Microbe Brew, Boomerang, SledgeHammer and pH UP and DOWN.
- Both have one: flower boosters, kelp, fish, roots, carbs and cal-mag. Run one, or test them side by side.
- Not on their list: a liquid humic, sea minerals and silica.
Put it side by side
Where both ranges have a product for the same job, the fair answer is a test in your own room. Here’s what to watch and how to keep it fair.
Keeping it fair
- Same plants. Clones off the same mother, same cultivar, same age.
- Same room. Same light, climate, media, pot size and watering.
- Same base. Keep the base feed and EC the same on both sides.
- One change. Change only the product being tested, and write down what you see each week.
Their line, Bloom’s fit at a glance
Matched on job, not NPK. FoxFarm prints teaspoons or grams per gallon, mostly every other watering or weekly; Bloom prints ml per litre on a weekly feed chart. Tap a tag to filter.
Keep your base. Bloom’s additives sit on top of it.
Keep it. Bloom’s additives go in around it.
Both aimed at the flip. Theirs is a powder, Ultra a liquid. Pick one, or plan the stack.
Same mid flower window. Pick one, or stagger them.
Both are late flower P and K. Pick one, or plan how they stack.
Both are kelp. Theirs stops at the buds; Seaweed carries on through the flush.
Both are fish based. Seafuel adds kelp and runs into late flower.
Both work the root zone. Kangaroots lists microbes; Roots lists amino acids, B vitamins and fulvic acid.
Both are carb inputs. Bembé starts at buds; SWTNR from veg. Pick one.
Same job. Theirs starts just before bud development; Bloom’s runs from veg. Run one.
These stay as they are.
Media stays. Bloom’s pages list soil, coco and hydro use.
Their humic acids sit in a soil amendment. These two go in the tank.
Potassium silicate, veg through early flower, tapering in late bloom.
Where each bottle sits in the cycle
FoxFarm’s timing in grey, Bloom’s in yellow, across shared stages of the grow.
| Stage | Root | Veg | Flip | 3–4 | 5+ | Last 2 | Flush |
|---|---|---|---|---|---|---|---|
| FoxFarm, per their pages | |||||||
| Grow Big® | |||||||
| Big Bloom® (every other watering) | |||||||
| Tiger Bloom® (every other watering) | |||||||
| Open Sesame® | |||||||
| Beastie Bloomz® | |||||||
| Cha Ching® | |||||||
| Kelp Me Kelp You® · Wholly Mackerel® | |||||||
| Kangaroots® · Microbe Brew® | |||||||
| Bembé® | |||||||
| Cal-Mag (FoxFarm) | |||||||
| Bloom, per Bloom’s weekly feed charts | |||||||
| Roots | |||||||
| Pre | |||||||
| Ultra | |||||||
| Phat (weeks 3 and 4) | |||||||
| Ooze (wk 5 to flush) | |||||||
| Final (with Ooze) | |||||||
| Seafuel | |||||||
| Seaweed · Humate · Sea Minerals | |||||||
| SWTNR | |||||||
| Cal-Mag | |||||||
| Groigen (foliar, as needed) | |||||||
| Florigen (foliar, as needed) | |||||||
| PK (as needed) | |||||||
| Silica | |||||||
Timing comes from each FoxFarm product page. Hatched bars are every-other-watering or every-other-week use. Their solubles are timed by plant week and bud set in the garden tips, so placing them on these stages is our read. Their Cal-Mag is as needed, at most weekly, from just before buds, so it’s pale. Bloom’s bars follow its weekly feed charts; pale Bloom bars are as-needed bottles or tapers.
Why each one fits
What the Bloom product does, the research behind that kind of input, and where it sits in a program that already runs.
Kelp and fish into flower
What it does. Seaweed is southern bull kelp at 1 ml/L weekly, seedling through the flush. Seafuel is tuna and kelp at 1 ml/L weekly, clone through late flower, tapering at the flush.
Reviews of seaweed extracts report effects on growth, root development and stress tolerance across many crops. Work on protein hydrolysates, the group fish inputs sit in, is newer and links them to nutrient uptake. None of it tests these bottles.
Ali et al. (2021), Plants (review) · Malécange et al. (2023), Int J Mol Sci (review)
How it stacks. Run Kelp Me Kelp You and Wholly Mackerel in veg as FoxFarm prints them, then carry kelp and fish on with Seaweed and Seafuel after first buds (our read).
Liquid humic and sea minerals
What it does. Humate is 10% humic acid at 2.5 ml/L weekly, seedling through flush. Sea Minerals is trace minerals from sea water at 0.13 ml/L weekly, veg to bloom.
A major review links humic substances to more lateral root growth and to root changes tied to nutrient uptake. It covers humic substances in general, not a product.
How it stacks. FoxFarm’s humic acids come in Happy Frog Soil Conditioner, a garden soil amendment. On Coco Loco or hydro, Humate is a tank input next to the liquid trio or Cultivation Nation (our read).
Silica, added first
What it does. Potassium silicate at 0.33 ml/L weekly, added to the water first, veg through early flower, tapering in late bloom.
An editorial on silicon research says it helps plants with some stresses, but there’s no conclusive evidence on how, and most work is on grasses.
Deshmukh, Ma and Belanger (2017), Frontiers in Plant Science (editorial)
How it stacks. Goes in first, then the FoxFarm base. Grow Big Hydroponic’s page asks for pH 5.8–6.3, so re-check pH after silica (our read).
Where the programs complement each other
Kelp and fish past the first buds
Kelp Me Kelp You stops at first buds and Wholly Mackerel at early fruiting. Seaweed runs weekly through the flush and Seafuel into late flower, so a grower can carry kelp and fish on once their veg tonics finish.
Liquid humic for Coco Loco and hydro runs
FoxFarm’s humic acids come in a garden soil amendment, and there’s no liquid humic or sea-mineral bottle. Humate and Sea Minerals go in the tank at 2.5 and 0.13 ml/L weekly, next to Grow Big Hydroponic or Cultivation Nation.
Silica and cal-mag before the buds
Their Cal-Mag starts just before bud development, and there’s no silica on their list. Silica at 0.33 ml/L weekly from veg, and Bloom’s Cal-Mag from veg if a grower wants it earlier (our read).
Already covered
- Base feed. The liquid trio, Grow Big Hydroponic, or the Cultivation Nation 3-part.
- Flower boosters. Open Sesame, Beastie Bloomz and Cha Ching across flower.
- Kelp, fish and carbs. Kelp Me Kelp You and Wholly Mackerel in veg, Bembé from buds.
- Roots and microbes. Kangaroots, Microbe Brew and Boomerang.
- Cal-mag. Bush Doctor Cal-Mag.
Stays exactly as is
- Your FoxFarm base. Liquid trio or Cultivation Nation 3-part.
- Microbe Brew® and Boomerang®. Bloom doesn’t make an inoculant.
- SledgeHammer®. Bloom has no rinse or flush solution.
- pH UP and pH DOWN. Bloom has no pH adjusters.
- Ocean Forest®, Happy Frog®, Coco Loco®. Bloom doesn’t make media.
Background, science and sources
Who FoxFarm are
FoxFarm is a soil and fertilizer company born and raised in Humboldt County, California. Its About page, from founder and CEO Willy, says it started with a garden soil that wasn’t sterilized, and it has supplied growers since 1984.
The range covers potting soils and mixes, the liquid trio, Grow Big Hydroponic, the Cultivation Nation 3-part and growing media, soluble flower boosters, the Bush Doctor additives, Happy Frog dry fertilizers and pH adjusters. They publish feeding schedules for soil, hydro and the Cultivation Nation 3-part.
Sources: About · All products · Feeding schedules
What each company brings
FoxFarm: Potting soils, coco and growing media, a soil conditioner, the liquid trio and a 3-part base, soluble flower boosters, Bush Doctor kelp, fish, carb, cal-mag, microbial and rinse products, dry fertilizers, pH adjusters and printed feeding schedules.
Bloom: one additive for each stage of the crop, seaweed, humic and sea mineral inputs, foliar sprays, and weekly feed charts for soil, coco and hydro. Rates and timing are on every product page.
Cropping Solutions, the other brand under Agricultural Organics, isn’t part of this report.
Dose basis: how each side counts
FoxFarm prints rates in teaspoons, tablespoons or grams per gallon. Most liquids are every other watering or every other week; the solubles are once a week in soil. Kelp Me Kelp You is 5–10 mL per gallon every other week, about 1.3–2.6 ml/L each time. Their Cal-Mag is 5 mL per gallon, about 1.3 ml/L, no more than once a week.
Bloom prints ml per litre on a weekly feed chart. So the per-application numbers on each side aren’t the same weekly amount, and the analyses differ too.
Mix calculator
Rates as printed on each company’s page (1 US gallon is 3.785 L). Bloom’s rates are per litre of nutrient solution, dosed weekly per its feed charts. Pick a product and your tank size.
Potassium in the plantWell supported
Hasanuzzaman and colleagues (2018) review potassium’s roles in enzyme activity, stomata, photosynthesis and carbohydrate metabolism, and in tolerance to drought, salt and heat.
Why it matters here: Open Sesame, Beastie Bloomz, Cha Ching and Bloom’s PK all bring potassium in flower, so add up the total before stacking them (our read). The review doesn’t compare products.
Sources, all viewed 5 November 2026
FoxFarm: About · All products · Feeding schedules · Grow Big® · Grow Big® Hydroponic · Big Bloom® · Tiger Bloom® · Cultivation Nation® Micro · Open Sesame® · Beastie Bloomz® · Cha Ching® · Kelp Me Kelp You® · Wholly Mackerel® · Kangaroots® · Microbe Brew® · Boomerang® · Bembé® · Bush Doctor® Cal-Mag · SledgeHammer® · Happy Frog® Soil Conditioner
Bloom: Roots · Pre · Ultra · Phat · Ooze · Final · Seafuel · Seaweed · SWTNR · Humate · Cal-Mag · Groigen · Florigen · Sea Minerals · PK · Euro · Grow · Flower · Silica · OrganiShield
Last checked 5 November 2026. Public information only. Not affiliated with, endorsed by or approved by FoxFarm; product names belong to their owners. Please confirm current details with the manufacturer. Corrections: nathan@bloomyellowbottles.com. All Fit Reports