HydroDynamics International and Bloom
HydroDynamics makes the cloning gear and a lean base feed. Bloom makes the weekly additives. Here’s how the two line up across the grow.
Last checked 5 November 2026 · Public information only
This Fit Report is a summary of publicly available information about HydroDynamics International 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 HydroDynamics International, 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 Spotted something out of date?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.
Clonex gets them rooted, Bloom carries on from there.
HDI’s range is propagation (Clonex gel, solution and mist, Root Riot cubes) plus a short feed line: IONIC Grow and Bloom, IONIC PK Boost and MotherPlant for stock plants. Their list has no seaweed, fish, humic, cal-mag, silica or stage additives. That’s where Bloom’s weekly bottles come in, on top of IONIC or MotherPlant.
- Stays as is: Clonex Rooting Gel, Clone Solution and Mist, Root Riot, IONIC Grow and Bloom, MotherPlant A and B.
- Both have one: a late-flower PK. Run one, or test them side by side.
- Not on their list: kelp, tuna, humic, sea minerals, cal-mag, carbs, silica, stage additives and foliars.
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 tuna over IONIC
What it does. Seaweed is southern bull kelp; Seafuel is tuna and kelp. Both run at 1 ml/L weekly: Seaweed seedling through the flush, Seafuel clone through late flower, tapering at the flush.
Reviews of seaweed extracts report effects on growth and stress tolerance across many crops. Work on protein hydrolysates, which fish inputs belong to, is newer and links them to nutrient uptake, mostly under stress. None of it tests these bottles or cannabis.
Ali et al. (2021), Plants (review) · Malécange et al. (2023), Int J Mol Sci (review)
How it stacks. IONIC is one bottle at 5 ml/L, so the tank stays simple. Seaweed and Seafuel go in after it (our read: check runoff EC when you add anything).
Humic acid 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 changes in root structure and function tied to nutrient uptake, including more lateral roots. It doesn’t test either company’s products.
How it stacks. Once Clonex has done its job, Humate supports the root zone from transplant on. Small doses, no change to the IONIC rate (our read).
Cal-Mag and Silica
What it does. Cal-Mag is calcium and magnesium with iron and zinc, 1 ml/L weekly in soil, coco or hydro, stopping at the final flush. Silica is potassium silicate at 0.33 ml/L weekly, added first. These are mineral supplements, so there’s no study cited for them here.
How it stacks. Silica into plain water first, then Cal-Mag, then IONIC (our read: the usual order for silicate and calcium).
One bottle per stage
What it does. Pre in mid veg, Ultra at the flip, 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. IONIC Grow and Bloom stay the same all the way through; these add the stage changes on top. IONIC PK Boost already covers the last weeks, so PK stays optional (our read).
Where the programs complement each other
IONIC as the base, Bloom on top
IONIC is a one-bottle base with nothing else in the tank. Seaweed, Seafuel, Humate, Sea Minerals, Cal-Mag and Silica go in at 0.13–2.5 ml/L weekly over it.
Clonex to the tray, Bloom from transplant
HDI’s cloning kit ends at transplant. Roots, Humate and Groigen pick up from there, so the two ranges hand over at the same point (our read).
MotherPlant with weekly tonics
MotherPlant is a stock-plant base. Seaweed, Humate and Silica are weekly tonics that can run with it in a mother room (our read).
Where each bottle sits in the cycle
HydroDynamics International’s timing in grey, Bloom’s in yellow, across shared stages of the grow.
| Stage | Root | Veg | Flip | 3–4 | 5+ | Last 2 | Flush |
|---|---|---|---|---|---|---|---|
| HydroDynamics International, per their pages | |||||||
| Clonex Gel, Mist and Root Riot | |||||||
| Clonex Clone Solution | |||||||
| MotherPlant A and B (stock plants) | |||||||
| IONIC Grow | |||||||
| IONIC Bloom | |||||||
| IONIC PK Boost (final weeks) | |||||||
| 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 HDI product page. Clonex Mist runs until transplant. MotherPlant feeds stock plants rather than a crop stage, so it’s pale on the veg column (our read). PK Boost is for the final few weeks before harvest, drawn from week 5 here (our read). 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. HDI prints rates per gallon and per litre, used with each irrigation; Bloom prints ml per litre on a weekly feed chart. Tap a tag to filter.
The gel at the cut stays. Bloom starts after it.
Their young-plant feed stays. Nothing in Bloom’s range does this job.
A cloning-tray spray. It stops at transplant, where Bloom’s foliars start (our read).
Bloom doesn’t make media, so the cubes stay.
Keep the one-bottle base. Bloom’s additives go in on top of it.
Their mother-plant feed stays. Bloom’s tonics can run alongside it (our read).
Both are PK. HDI’s runs the final weeks; Bloom’s is an as-needed bottle shown at week 5. Plan the stack, or pick one.
Southern bull kelp, and a tuna and kelp tonic, through the cycle.
10% humic acid, plus trace minerals from sea water.
Calcium and magnesium with iron and zinc, labelled 6.8-0-0, grow and bloom.
Carbohydrates and potassium, from mid veg to the flush.
Potassium silicate, labelled 0-0-4, veg through early flower.
One bottle for each stage, from mid veg to the finish.
Foliar sprays for veg and the flip, every few days as needed.
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.
Already covered
- Propagation. Clonex Rooting Gel, Clone Solution, Mist and Mist Concentrate, and Root Riot cubes.
- Base feed. IONIC Grow and IONIC Bloom, one bottle, every medium.
- Stock plants. MotherPlant A and B.
- Late flower. IONIC PK Boost.
Stays exactly as is
- The Clonex range and Root Riot. Bloom has no cloning gel, clone feed or media.
- IONIC Grow and Bloom. Bloom has no single-part base.
- MotherPlant A and B. Bloom has no stock-plant feed.
- IONIC PK Boost. If it’s working in your room, keep it, or test PK next to it.
Background, science and sources
Who HydroDynamics International are
HydroDynamics International (HDI) says it has been family owned and operated since 1997. It makes propagation products and fertilisers for hydro, soil and soilless growing. The pages we read don’t give a street address or a parent company.
The range is the Clonex line (Rooting Gel, Clone Solution, Mist and Mist Concentrate), Root Riot starter cubes, IONIC Grow, IONIC Bloom and IONIC PK Boost, and MotherPlant two-part for stock plants. They publish a propagation guide, a cloning guide, a seed starting SOP, an IONIC feed schedule and SDS sheets. Sales run through dealers, with a store locator and a dealer support page.
Sources: Home · About · Products · Dealer support
What each company brings
HydroDynamics International: A full cloning kit (gel, clone feed, mist and starter cubes), a single-part base for every medium, a PK finisher, a stock-plant feed, and printed propagation guides.
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
HDI prints rates per gallon and per litre, to use with each irrigation: IONIC Grow and Bloom at 5 ml/L, PK Boost at 2 ml/L, MotherPlant at 15–20 ml per gallon of each part (about 4–5.3 ml/L). Bloom prints ml per litre on a weekly feed chart; Bloom’s PK is 1 ml/L.
HDI’s rates go in with each irrigation; Bloom’s sit on a weekly chart, so the same number on each side isn’t the same weekly amount.
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 plants: protein synthesis, carbohydrate metabolism, enzyme activation, stomatal control and photosynthesis, plus tolerance to salinity, drought and heat.
Why it matters here: IONIC PK Boost and Bloom’s PK are both PK products, so potassium is the shared ground. The review is general plant science and doesn’t compare products or timing.
Sources, all viewed 5 November 2026
HydroDynamics International: Home · About · Products · Clonex Rooting Gel · Clonex Clone Solution · Clonex Mist · Clonex Mist Concentrate · Root Riot · IONIC Grow (HydroDynamics) · IONIC Bloom · IONIC PK Boost (HydroDynamics) · MotherPlant A and B · Dealer support
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 HydroDynamics International; product names belong to their owners. Please confirm current details with the manufacturer. Corrections: nathan@bloomyellowbottles.com. All Fit Reports