GreenPlanet PK Spike phosphorus and potassium bloom booster bottle

GreenPlanet PK Spike, Phosphorus & Potassium Bloom Supplement

Name: GreenPlanet PK Spike
Rating: 5.00 (4 reviews)

$29.95 AUD

GST included.

In stock

Pickup available at Quick Bloom Lights Store, Sydney Australia

Usually ready in 1 hour

Free Shipping

Free shipping applies to any item over $35 AUD.

Express Shipping

Upgrade to Express Shipping for $12.95, which moves your order to the front of the queue and ships the same business day if placed before noon. Premium carriers are used for express orders.

Delivery Times

Metro areas: 1–2 business days

Perth: 5–7 business days

Regional / remote areas: 5–10 business days

Shipping times may vary based on carrier delays or regional factors.

PO Boxes & Parcel Lockers

Select Australia Post at checkout for an additional $20 — this is required for PO Box delivery, as our other carriers don't deliver to PO Boxes. Not all items are eligible due to size or weight; email sales@quickbloomlights.com.au before ordering to confirm.

Bulky or Remote Orders

In some cases, if an item is too large, heavy, or the delivery address is remote or rural, an additional shipping charge may apply. If this occurs, our team will contact you before dispatch to confirm any extra cost or available delivery options.

Discreet Packaging

All orders are packed plain and unbranded. We remove or cover any manufacturer logos, product names, or giveaways to ensure your privacy.

Authority to Leave (ATL)

All parcels are shipped with Authority to Leave (ATL) unless otherwise specified by the customer. This allows faster delivery and avoids missed deliveries, but please ensure your drop-off location is secure.

2 Year Warranty on AC Infinity Products (PH/EC Probes excluded)

1 Year on Seed Starter and other standard products, unless otherwise specified

For full warranty and claim details, see our Warranty Information page. For returns, see our Refund Policy.

The GreenPlanet PK Spike is a concentrated phosphorus and potassium booster for the flowering stage. At its maximum rate of 1 mL per litre it adds a 250 ppm P/K spike to your feed, starting from week 2 of flower.

250 ppm

P/K at 1 mL/L

1 mL/L

maximum rate

Week 2+

of flower

1–20 L

sizes

A measured boost

Flowering plants use more phosphorus and potassium as flowers set and fill. PK Spike delivers a uniform dose of both, and because it's concentrated, a little goes a long way: 1 mL per litre is the most you'll ever need, giving a 250 ppm P/K lift on top of your base.

When to use it

Start in week 2 of flower and follow GreenPlanet's feed program for the weeks it runs. Count its contribution when you check EC so the total feed stays on target.

Full specifications

Manufacturer	GreenPlanet Nutrients (British Columbia, Canada) — bottled in Australia under licence by WHG, Melbourne
Type	Liquid phosphorus and potassium booster
Maximum rate	1 mL per litre = 250 ppm P/K
Start	Week 2 of flower
Dose schedule	Per the Dual Fuel feeding program (PDF)
Sizes	1 L · 5 L · 20 L

Feed rates: use GreenPlanet's official nutrient calculator. Choose your feed program, select litres and enter your reservoir size. GreenPlanet keeps the rates current.

FAQ

Can I use more than 1 mL/L?

No. 1 mL per litre is the maximum. More phosphorus and potassium isn't better and can push calcium and magnesium out of reach.

PK Spike or Bud Booster?

Both lift P and K in flower. PK Spike is a liquid; Bud Booster is a powder with added boron and nitrogen. Use one.

Can I mix it with another brand?

We don't recommend it. GreenPlanet's feed programs are built around its own bases and additives, so results are most predictable when you stay within the range.