Xtreme Gardening and Bloom
Xtreme Gardening puts fungi and bacteria on the roots. Bloom puts kelp, fish, humic and stage additives in the tank. Here’s where the two programs sit together.
Last checked 5 November 2026 · Public information only
This Fit Report is a summary of publicly available information about Xtreme Gardening 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 Xtreme Gardening, 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 Spotted something out of date?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.
Mykos on the roots, Bloom in the weekly tank.
Xtreme Gardening’s range is mostly biology: a mycorrhizal fungus, a nitrogen-fixing bacterium and a Bacillus blend, plus a compost tea, a calcium spray and a kelp with humic. Their schedule runs weekly through veg and early flower. Bloom has no inoculants, and its stage bottles pick up where their schedule tapers in late flower.
- Stays as is: Mykos, Mykos WP, Root Paks, Azos, Azos Red, Versity and Xtreme Tea.
- Both have one: a kelp with humic, and a calcium product. Run one, or test them side by side.
- Not on their list: a base feed, fish, sea minerals, silica, late flower and finish additives.
Already covered
- Mycorrhizae. Mykos granular, Mykos WP and Root Paks, all Rhizophagus intraradices.
- Bacteria. Azos and Azos Red Liquid (Azospirillum), and Versity (six Bacillus species).
- Brews and kelp. Xtreme Tea and Premium Kelp + Humic Acid.
- Calcium. CalCarb, a calcium carbonate leaf spray.
Stays exactly as is
- Mykos, Azos and Versity. Bloom makes no microbial products.
- Xtreme Tea. Bloom doesn’t make a brewed tea.
- CalCarb. A leaf spray; Cal-Mag is a feed product, so they can run together.
- Their Kelp. If it’s working in your room, keep it, or test Bloom’s next to it.
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.
Where their schedule tapers
What it does. Phat in flower 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. Mykos WP, Azos and Xtreme Tea are set weekly through veg and early flower. Bloom’s late bottles start around where those finish, so the two schedules hand over rather than pile up (our read).
Fish and carbs next to the fungi
What it does. Seafuel is tuna and kelp at 1 ml/L weekly, clone through late flower, tapering at the flush. SWTNR is carbohydrates and potassium at 1 ml/L weekly, veg week 2 to the flush.
A 2018 review looks at pairing microbial inoculants, mycorrhizal fungi included, with seaweed, humic 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. Xtreme’s pages say to use Mykos WP right after mixing. Our read: mix the inoculant on its own, then add Bloom’s tonics, and check both labels before combining.
A base feed around the biology
What it does. Euro A+B runs veg to bloom at 1–2 ml/L each part. Grow A+B and Flower A+B split the same job by stage, with Flower taking over after the change to 12/12.
How it stacks. Xtreme’s range has no base feed. Their pages say Azos and Mykos work with your watering. A two-part base is the feed underneath (our read: start low and watch runoff when inoculating).
Where each bottle sits in the cycle
Xtreme Gardening’s timing in grey, Bloom’s in yellow, across shared stages of the grow.
| Stage | Root | Veg | Flip | 3–4 | 5+ | Last 2 | Flush |
|---|---|---|---|---|---|---|---|
| Xtreme Gardening, per their pages | |||||||
| MYKOS and Root Paks (planting) | |||||||
| AZOS and AZOS Red | |||||||
| MYKOS WP (weekly) | |||||||
| XTREME TEA (weekly) | |||||||
| VERSITY (every 2 weeks) | |||||||
| PREMIUM KELP + HUMIC | |||||||
| CALCARB (leaf spray) | |||||||
| 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 Xtreme product page. Mykos WP, Azos and Xtreme Tea say weekly through veg and early flower. Versity says at planting then every two weeks through veg and flower, and Kelp weekly through veg and flower. CalCarb’s page says both bi-weekly and weekly, so it’s pale. Bloom’s bars follow its weekly feed charts; pale Bloom bars are as-needed bottles.
Their line, Bloom’s fit at a glance
Matched on job, not NPK. Xtreme prints rates per US gallon, by the spoon or by container size. Bloom prints per litre on a weekly feed chart. Tap a tag to filter.
Goes in the planting hole touching the roots. Nothing in Bloom’s range does this job.
Weekly through veg and early flower in reservoirs and drenches. Bloom’s additives run in the same weeks.
Placed at the root zone of the pot. Stays as is.
For cuttings, transplants and the reservoir through veg. Bloom has no bacterial product.
A Bacillus blend for drench or spray. Stays on their schedule.
A brewed tea for the root zone. Bloom doesn’t make one.
Both bring kelp and humic. Theirs is one bottle; Bloom splits southern bull kelp and 10% humic acid into two. Pick a setup, or test them.
Both bring calcium. CalCarb goes on the leaves; Cal-Mag goes in the feed with magnesium, iron and zinc. They can run together (our read).
Xtreme’s range is biology and supplements. A two-part base feeds the crop around it.
A tuna and kelp tonic, and a carbohydrate and potassium additive from veg week 2.
Their schedule runs through veg and early flower. These pick up from flower week 3 to the flush.
Trace minerals from sea water, and potassium silicate added first in veg.
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.
Where the programs complement each other
Their early program, Bloom’s late one
Xtreme’s weekly schedule runs veg and early flower. Phat, Ooze and Final run flower week 3 to the flush, so a grower gets a full-cycle plan without doubling up (our read).
A base and tonics under the biology
Xtreme has no base feed, fish or sea minerals. Euro A+B, Seafuel, SWTNR and Sea Minerals fill those jobs at 0.13–2 ml/L weekly.
Kelp + Humic and Seaweed + Humate
Both ranges bring kelp and humic. Theirs is one bottle, Bloom’s is two. A fair test in one room shows which setup a grower wants (our read).
Background, science and sources
Who Xtreme Gardening are
Xtreme Gardening makes biological products for growers, and its site says it has supplied arbuscular mycorrhizal fungi for over 11 years. Products are cultivated and packaged in California and sold through more than 500 garden supply dealers worldwide.
The range is Mykos (granular, wettable powder and Root Paks), Azos and Azos Red Liquid, Versity, Xtreme Tea, CalCarb and Premium Kelp + Humic Acid. Most products print rates by container size and a weekly schedule through veg and early flower. They sell online and through a store locator.
Sources: Home · MYKOS · Store locator
What each company brings
Xtreme Gardening: Mycorrhizal inoculants in three formats, nitrogen-fixing and Bacillus bacteria, a compost tea kit, a calcium leaf spray and a kelp with humic, with rates printed by container size.
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
Xtreme prints rates per US gallon or by container size, often by the spoon. Bloom prints ml per litre on a weekly feed chart. At 3.785 L to the gallon, Azos Red’s 5 mL/gal is about 1.3 ml/L, and Kelp’s root drench of 0.5–1 oz/gal is about 3.9–7.8 ml/L. Bloom’s Seaweed is 1 ml/L and Humate 2.5 ml/L.
Xtreme’s Kelp and Bloom’s tonics are both weekly, but the analyses differ, so bottle volume on its own isn’t a like-for-like dose. Mykos WP and Versity are dry powders, so they aren’t in the calculator.
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.
Mycorrhizal fungi and the plantWell supported
Begum and colleagues (2019) review arbuscular mycorrhizal fungi. They report the fungi boost uptake of nutrients, phosphate in particular, and help plants handle heat, salt and drought.
Why it matters here: Mykos is Rhizophagus intraradices, an arbuscular mycorrhizal fungus. The review is general and doesn’t test Mykos or Bloom.
Seaweed extractsWell supported
Ali and colleagues (2021) review seaweed extracts as biostimulants, covering growth effects and tolerance to drought, salt, cold, pests and disease.
Why it matters here: Xtreme’s Kelp is Alaskan bull kelp and Bloom’s Seaweed is southern bull kelp. The review covers seaweed extracts in general, not either bottle.
Sources, all viewed 5 November 2026
Xtreme Gardening: Home · MYKOS · MYKOS WP · MYKOS Root Paks · AZOS · AZOS Red Liquid · VERSITY · XTREME TEA · CALCARB · PREMIUM KELP + HUMIC ACID · Store locator
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 Xtreme Gardening; product names belong to their owners. Please confirm current details with the manufacturer. Corrections: nathan@bloomyellowbottles.com. All Fit Reports