Hydrodynamics International (HDI) Feeding Schedule
About Hydrodynamics International
Hydrodynamics International makes Clonex, which is close to a default in propagation — the rooting gel that sits on most cloning benches, and the reason this brand is on our shelves at all. The gel holds moisture against the cut and carries hormone and micronutrient in a form that stays put, which is why it outperforms a dip-and-hope approach.
The company also makes the Ionic nutrient line, a straightforward one-part-per-stage program that is easy to run and hard to get wrong.
The feed schedule
Lines we carry
- Clonex Rooting Gel — the propagation standard
- Clonex Clone Solution — the nutrient for cuttings and young roots
- Clonex Mist — foliar for cuttings under dome
- Ionic — the one-part-per-stage nutrient line the schedule covers
Reading the schedule
The Ionic schedule is one grid per growing medium — make sure you are reading the hydro, coco or soil column that matches your setup, because the rates differ meaningfully between them.
Clonex products are label-directed rather than scheduled. Decant a small amount of gel into a separate cup rather than dipping cuttings into the bottle; it keeps the jar clean and is basic pathogen hygiene.
Ionic feed schedule (table)
| Parameters | Cuttings & Seedlings | Vegetative | Early Bloom | Bloom | Late Bloom* | Flush | |
|---|---|---|---|---|---|---|---|
| — | Weeks 1-2 | Weeks 3-4 | Weeks 1-3 | Weeks 4-7 | Weeks 8-9 | Final Week | |
| Electrical Conductivity | 0.8 - 1.1 | 1.0 - 1.5 | 1.5 - 1.8 | 1.5 - 1.8 | 1.5 - 2.0 | 1.5 - 1.8 | — |
| PPM (700 Scale) | 560 - 770 | 700 - 1050 | 1050 - 1260 | 1050 - 1260 | 1050 - 1400 | 1050 - 1260 | — |
| PPM (500 Scale) | 400 - 550 | 500 - 750 | 750 - 900 | 750 - 900 | 750 - 1000 | 750 - 900 | — |
| Clonex Clone Solution | 20 mL/Gal | — | — | — | — | — | — |
| Ionic Grow | — | 10-20 mL/Gal | 15-20 mL/Gal | — | — | — | — |
| Ionic Bloom | — | — | — | 15-20 mL/Gal | 15-20 mL/Gal | 15-20 mL/Gal | — |
| Ionic PK Boost | — | — | — | — | 6-8 mL/Gal | — | — |
| Clonex Mist (foliar spray) | Every 2-3 days | — | — | — | — | — | — |
* Hydrodynamics International's own chart note on the Late Bloom column: “Use up to 12 weeks for long-flowering varieties of plants.”
The chart's own Flush column prints a faucet-and-water-drop icon instead of a number on every row — reproduced above as a dash, meaning the manufacturer's own instruction is plain water with no nutrient added during that final week.
Actual concentration values may vary based on source water, per the manufacturer's own chart.
Figures as published by Hydrodynamics International on the Ionic feed schedule image above. Feeding charts are recommendations only. Adjustments may be needed based on environmental conditions, your grow structure, and any additional products you run. Actual results vary.
Shop HydroDynamics
Everything on this schedule, stocked at Milford and Webster.
