Mammoth Ag and Bloom
Mammoth Ag’s best-known bottle is Mammoth P, a bacterial team for phosphorus. Bloom has no bacteria. Here’s where the two ranges overlap, and where they stack.
Last checked 5 November 2026 · Public information only
This Fit Report is a summary of publicly available information about Mammoth Ag 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 Mammoth Ag, 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 Spotted something out of date?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.
Mammoth P in the tank, Bloom’s weekly bottles beside it.
Mammoth Microbes, which calls itself Mammoth Ag on its About page, started with Mammoth P: four bacteria its page says increase phosphorus and micronutrient availability. It now also sells an IPM spray, a silica, plant foods and propagation gear. Bloom makes no microbial products, so Mammoth P stays. Kelp, fish, humic and the stage bottles are where Bloom adds.
- Stays as is: Mammoth P and the Starter Plug Trays.
- Both have one: silica, an IPM spray, a base feed and something for cuttings.
- Not on their list: kelp, fish, humic, cal-mag, stage additives and foliar feeds.
Mammoth Ag and Bloom in short
Mammoth P and the Starter Plug Trays.
Control, Silica, the plant foods and Rooting Gel each sit near a Bloom product.
Seaweed, Seafuel, Humate, Sea Minerals, Cal-Mag, SWTNR, the five stage bottles and the foliars.
Where the programs complement each other
Mammoth P with Bloom’s tonics
Mammoth P is bacteria. Seaweed, Seafuel, Humate and Sea Minerals add kelp, tuna, humic and trace minerals at 0.13–2.5 ml/L weekly, with no product doubled up.
Stage bottles across flower
Mammoth’s range has no stage additives. Ultra, Phat, Ooze and Final give a grower a weekly bottle from the flip to the flush.
Silica and IPM, side by side
Both ranges have a silica and a pest spray. Control also lists mildew and botrytis; OrganiShield is an insecticide and miticide. A fair test in one room shows what a grower wants to keep (our read).
Their line, Bloom’s fit at a glance
Matched on job, not NPK. Mammoth prints rates per US gallon, often split between houseplants and outdoor plants. Bloom prints per litre on a weekly feed chart. Tap a tag to filter.
Their flagship, for all growth stages. Bloom’s additives go in next to it.
Both are IPM sprays. Control also lists powdery mildew and botrytis on its label. Check both labels for your pest.
Both start from potassium silicate. Theirs adds microbes and calcium; Bloom’s is a straight silica. Pick one.
Both are base feeds. Theirs are single-part, labelled for houseplants and gardens; Bloom’s are two-part. Run one base.
Both are used at the cutting. Roots can carry on in the weekly feed after the cut.
Propagation media. Bloom doesn’t make any, so they stay.
Southern bull kelp, and a tuna and kelp tonic, through the cycle.
10% humic acid, plus trace minerals from sea water.
Calcium and magnesium for soil, coco or hydro, and carbohydrates and potassium from veg week 2.
One bottle for mid veg, the flip, mid flower, late flower and the finish.
Leaf feeds for veg and the flip. Control is a pest spray, a different job.
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.
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.
Humate and sea minerals next to Mammoth P
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 2018 review looks at pairing bacterial and fungal inoculants with humic, seaweed and protein inputs. It says the mix could add up to more than each alone, but published data on those pairings is still limited. It doesn’t test these products.
How it stacks. Mammoth P is about making phosphorus and micronutrients more available. Humate and Sea Minerals add humic material and trace minerals to that same root zone (our read: check both labels before mixing).
Kelp and tuna in the tank
What it does. Seaweed is southern bull kelp; Seafuel is tuna and kelp. Both run at 1 ml/L weekly: Seaweed from seedling through the flush, Seafuel from clone through late flower, tapering at the flush.
A 2021 review reports seaweed extracts affect growth and stress tolerance across many crops. A 2023 review links protein hydrolysates, which fish inputs belong to, with nutrient uptake. Neither tests these bottles.
Ali et al. (2021), Plants (review) · Malécange et al. (2023), Int J Mol Sci (review)
How it stacks. Mammoth’s page says Mammoth P runs clean in all systems. Seaweed and Seafuel are 1 ml/L weekly on top of whatever base is in the tank.
A bottle for each flower week
What it does. Ultra at the flip (flower weeks 1–2), Phat in weeks 3 and 4, Ooze from week 5 through the final flush, and Final for the last two weeks alongside Ooze. 1–2.5 ml/L, weekly. These are timing tools, so there’s no study cited for them here.
How it stacks. Mammoth’s range runs the same products through all stages. Bloom’s stage bottles drop into those weeks without changing the base (our read: check runoff when you add anything).
Where each bottle sits in the cycle
Mammoth Ag’s timing in grey, Bloom’s in yellow, across shared stages of the grow.
| Stage | Root | Veg | Flip | 3–4 | 5+ | Last 2 | Flush |
|---|---|---|---|---|---|---|---|
| Mammoth Ag, per their pages | |||||||
| Rooting Gel and Starter Plugs | |||||||
| Mammoth P (twice weekly) | |||||||
| Silica (Mammoth), weekly | |||||||
| Plant foods, weekly | |||||||
| Control (weekly or as needed) | |||||||
| 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 Mammoth product page. Mammoth P and Silica say all growth stages; the plant foods say weekly in the growing season. Control is weekly or as needed, so it’s pale. Rooting Gel and the plugs are drawn at propagation (our read). Bloom’s bars follow its weekly feed charts; pale Bloom bars are as-needed bottles.
Already covered
- Bacteria. Mammoth P, four strains for phosphorus and micronutrients.
- IPM. Control, a corn and thyme oil spray for insects, mites and mildew.
- Silica and plant foods. Silica, Plant + Flower, Tomato + Veggie and Organic Plant Food.
- Propagation. Rooting Gel and Starter Plug Trays.
Stays exactly as is
- Mammoth P. Bloom makes no microbial products.
- Starter Plug Trays. Bloom makes no growing media.
- Control. If it’s working on your pests, keep it, or test OrganiShield next to it.
- Their silica and plant foods. Keep them, or run Bloom’s in a side-by-side.
Background, science and sources
Who Mammoth Ag are
Mammoth Microbes sells under the Mammoth name and refers to itself as Mammoth Ag on its About page. Its products were designed by Colorado State University scientists. The timeline starts in 2013 with a CSU microbe discovery, Mammoth P launched in the US in 2015, more US patents followed in 2017 and distribution reached other continents in 2019.
The range is Mammoth P, Control, Silica, Rooting Gel, Micros, Myco, three plant foods and Starter Plug Trays. The site pitches to field agriculture, indoor and hydroponic growers, and home gardeners.
What each company brings
Mammoth Ag: A patented bacterial product for phosphorus availability, a corn and thyme oil IPM spray, a silica with microbes, plant foods, propagation products, and Colorado State University science behind the brand.
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
Mammoth prints rates per US gallon. At 3.785 L to the gallon, Mammoth P’s 0.6 mL/gal is about 0.16 ml/L, twice a week. Their Silica’s outdoor rate of 15 mL/gal is about 4 ml/L weekly, and Plant + Flower’s 15 mL/gal is about 4 ml/L weekly. Bloom’s Silica is 0.33 ml/L weekly.
Mammoth’s Silica lists 0.05% soluble silicon plus microbes; Bloom’s Silica is labelled 0-0-4 potassium silicate. The analyses differ, so bottle volume on its own isn’t a like-for-like dose.
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.
Bacteria that free up phosphorusWell supported
Alori, Glick and Babalola (2017) review phosphorus-solubilising microbes, naming Pseudomonas, Bacillus and Enterobacter among them. They report these microbes make insoluble soil phosphorus more available to plants.
Why it matters here: Mammoth P lists Pseudomonas and Enterobacter strains and is sold for phosphorus availability. The review is general and doesn’t test Mammoth P or Bloom.
Silicon in the plantWell supported
Luyckx and colleagues (2017) sum up silicon research: it helps plants handle salt, drought and heavy metals, and acts as a deterrent to herbivores.
Why it matters here: both ranges sell a potassium silicate product. The paper is general plant science and doesn’t compare products.
Sources, all viewed 5 November 2026
Mammoth Ag: Home · About · Mammoth P · Control · Silica (Mammoth) · Plant + Flower · Organic Plant Food · Tomato + Veggie · Rooting Gel · Starter Plug Trays
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 Mammoth Ag; product names belong to their owners. Please confirm current details with the manufacturer. Corrections: nathan@bloomyellowbottles.com. All Fit Reports