The GreenPlanet Horti Grow 8-11-21 is the vegetative base of GreenPlanet's HORTI commercial line. A dry, fully soluble fertiliser fortified with magnesium, sulfur and a full micronutrient blend, it pairs with Horti Cal to build roots and foliage before flower.
The HORTI veg base
Horti Grow supplies nitrogen, phosphorus and potassium for early growth, with magnesium and sulfur for chlorophyll and a full micronutrient blend to keep growth balanced. It's 100% water-soluble and pH-stable, leaving no residue in injectors, day tanks or dosing lines.
How to use it
To make a stock concentrate, mix about 0.9 kg in 3.78 litres of water (roughly 240 g per litre) and stir until fully dissolved. Run it with Horti Cal through veg, then switch to Horti Bloom at the flip. Weekly rates are on the HORTI AU feed chart (PDF).
Full specifications
| Manufacturer | GreenPlanet Nutrients (British Columbia, Canada) |
| Line | HORTI commercial line |
| Type | Dry, 100% water-soluble fertiliser |
| N-P-K | 8-11-21, plus Mg, S and micronutrients |
| Stage | Vegetative |
| Stock concentrate | ~0.9 kg per 3.78 L (≈240 g/L) |
| Feed chart | HORTI AU feed chart (PDF) |
| Size | 2.3 kg bag |
| Storage | Sealed, cool and dry |
| Compatibility | Injectors, day tanks and dosing lines; hydro, coco and soil |
FAQ
Do I need Horti Cal with it?
Yes. Horti Grow doesn't supply calcium — Horti Cal does. The two together make the HORTI veg recipe.
Can I combine it with Horti Cal in one concentrate?
No. Keep HORTI concentrates in separate stock tanks.
Can I use it with Dual Fuel?
No. HORTI and Dual Fuel are separate programs.