Description
Please note - the Athena Stack in this kit is decanted: Athena no longer supply Stack in this bottle size in the UK, so it is hand-decanted in-store from Athena's own larger branded bottle. It is genuine Athena Stack, measured out into the quantity this kit needs, with none left over sitting unused in your cupboard.
Please Note — Expired UK Stock
The Power Si in this kit is expired. We're telling you this upfront rather than burying it: it's still usable as a foliar feed, past peak potency, which is why it's priced lower than a fresh-stock equivalent. Power Si availability has been affected across the whole UK market recently, so this is the same batch situation most UK sellers are currently working with — if you see it listed elsewhere at full price with no mention of this, it's worth asking whether they're selling the same expired stock without telling you.
Save £££ with this combo! Add Athena Stack and Power Si diet on top of your existing base nutrients. Turbocharge your plants as you've never seen!
What you get:
Foliar spraying Power Si with Athena Stack will give you a faster transition into bloom, combined with tighter internode spacing and increased lateral branching.
- Foliar feed 7 days before flower once a week until week 3
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0.6ml PowerSi + 1.85ml Athena Stack per gallon (divide by 3.785 for litres)
Comparing Stack, IPW & Power Si Combos?
We stock 4 Athena Stack combos across two sizes. Full comparison below, or jump straight to another option:
Stack + IPW — Small | Stack + IPW — Standard | Stack + Power Si — Standard (this kit) | Stack + IPW + Power Si — Standard
| Combo | Size | Price | Contains |
|---|---|---|---|
| Stack + IPW — Small | 473ml IPW + 120ml Stack (Decanted) | £48.00 | IPW, Stack |
| Stack + IPW — Standard | 0.9L IPW + 0.9L Stack (Decanted) | £135.00 | IPW, Stack |
| Stack + Power Si — Standard (this kit) | 0.9L Stack (Decanted) + 250ml Power Si | £138.00 | Stack, Power Si (Expired UK Stock) |
| Stack + IPW + Power Si — Standard | 0.9L IPW + 0.9L Stack (Decanted) + 250ml Power Si | £195.00 | IPW, Stack, Power Si (Expired UK Stock) |
How much Athena does your grow actually need?
Tell us your medium, pot size and plant count. The Feed Chart Calculator builds your week‑by‑week chart with target EC, works out every bottle for the whole run, and puts them straight in your basket. You can price Athena against seventeen other brands while you are there.
