Ventana Plant Science Commercial Seaweed as a Timed Potassium Feed
This is a dry soluble additive, not a base nutrient, and it carries one guaranteed element. The label reads 0-0-14, with all of that potash derived from Ascophyllum nodosum extract and potassium hydroxide. There is no nitrogen and no phosphorus in the bag, so it sits on top of whatever base program you already run. Ventana writes the veg rate as 1.0 g/gal, applied every other week rather than at every fill. In flower the rate climbs to 2.0–2.5 g/gal, and it goes in during weeks 2 and 3, then once more in week 7. That timing lines up with early stretch and the late bulking window, when potassium demand runs highest. Every rate assumes a commercial lighting load of 25 W/sq ft. Under dimmer fixtures, Ventana advises dropping the dose, and under brighter ones raising it. If you do not know your intensity, start at the low end and work up over a few feeds. Mix it into water already sitting at pH 5.5–6.2, then check again once it dissolves. Potassium hydroxide is alkaline, so a strong flower dose can nudge the reading upward.
How This Seaweed Extract Powder Fits a Commercial Feed Chart
Weighing grams instead of pouring milliliters is the main adjustment for growers coming from liquid kelp. A basic jeweler's scale solves it, and the payoff is that nothing ships as water. Seaweed brings its own trace minerals and natural growth compounds along with the potash, which is why many rooms keep one kelp input in rotation. Because the extract dissolves fully, it runs through drippers and inline dosers without leaving sludge in the stock tank. Keep the bag sealed between uses. Dry soluble extracts pull moisture from humid air and cake up if they sit open in a warm mixing room. The small bag suits a single flower room testing the schedule, while the mid-size pouch covers a few cycles. The bulk sack is really only sensible for facilities that mix large batch tanks every week. One honest caution: this is a potassium source first, so it will not fix a nitrogen or calcium problem. Pair it with the rest of the Ventana commercial line or your existing base, and log the EC it adds.
Key Features
- Guaranteed 14% Soluble Potash: A single declared element keeps the math clean when you are building a custom commercial feed chart.
- Ascophyllum nodosum Extract: The same brown seaweed most kelp inputs rely on, delivered dry so no weight is spent on water.
- Scheduled Dosing Points: Every-other-week veg feeds and three flower applications mean you are not adding it to every reservoir change.
- Light-Scaled Rates: Rates are pegged to commercial intensity, so rooms running lower wattage can trim the dose instead of guessing.
- Fully Water-Soluble Powder: It dissolves into the stock tank and runs through drip lines and dosers without settling out.
- Three Pack Sizes: A 1 lb bag, a 3.5 lb bag and a 44 lb sack let the bag size match the size of the operation.
Technical Specifications
| Specification | Value |
|---|---|
| Guaranteed Analysis | Soluble Potash (K2O) 14.0% |
| NPK | 0-0-14 |
| Derived From | Seaweed extract (Ascophyllum nodosum), potassium hydroxide |
| Form | Dry water-soluble powder |
| Veg Rate | 1.0 g/gal, every other week |
| Flower Rate | 2.0–2.5 g/gal, weeks 2–3 and week 7 |
| Mixing pH | 5.5–6.2 |
| Rate Basis | Commercial lighting at 25 W/sq ft |
| Sizes | 1 lb, 3.5 lb, 44 lb |