The Athena Blended PK is the flowering booster of the Blended Line: a clean, low-nitrogen liquid that adds phosphorus and potassium on top of Bloom A & B from week 3 of flower. It's formulated to lift P and K without overdoing it, so the boost doesn't come at the cost of calcium and magnesium availability.
A booster that stays balanced
High-yielding plants use more phosphorus and potassium through the heavy middle weeks of flower. The problem with many PK boosters is that they add far more than the plant can use, and excess phosphorus and potassium start to push calcium and magnesium out of reach — a common source of late-flower deficiencies. Athena PK is dosed to complement Bloom A & B rather than overpower it, keeping the whole feed in balance through the stretch where it matters most.
Where it fits in the feed
Add PK from week 3 of flower, on top of Bloom A & B, at the rate the Blended feed chart gives for each week. The Blended Line runs on variable EC, so PK is one of the tools you use to raise feed strength through mid-flower without changing the base ratio.
Full specifications
| Manufacturer | Athena (Los Angeles, USA) |
| Line | Blended Line — variable EC |
| Type | Liquid mineral booster |
| N-P-K | 0-4-5 |
| Stage | Flowering, from week 3 |
| Dose rate | 0.8–2.6 mL per litre (3–10 mL per US gal) — see the Athena metric feed schedule (PDF) for the weekly rate |
| Sizes | 0.9 L (32 fl oz) · 3.78 L (1 US gal) · 18.9 L (5 US gal) |
| Compatibility | All media and water types; all dosing and drip systems; DWC and RDWC |
| Storage | Sealed in original bottle, 7–29°C (45–85°F) |
FAQ
Do I need PK if I already use Bloom A & B?
Bloom A & B is a complete flowering base. PK is optional, but it's part of the standard Blended feed chart and is how the chart lifts phosphorus and potassium through mid to late flower.
When do I start and stop it?
Start from week 3 of flower and follow the feed chart's weekly rates from there.
Can I use it with the Pro Line?
No — the Pro Line recipe is complete with Core and Bloom. PK is designed around Bloom A & B.
Can I use it in DWC?
Yes. It's part of the Blended Line, which is the Athena line for DWC and RDWC. Follow Athena's RDWC procedure for reservoir rates.
