Hydroponic Additives & Boosters

Take your yields to the next level with Apex Grow's range of hydroponic additives and bloom boosters, designed to complement your base nutrient program and push plants to their full genetic potential. Our range includes root stimulants, silica supplements, PK boosters, bloom enhancers, cal-mag supplements, beneficial microbes, and finishing agents from leading brands including Terra Aquatica, Growth Technology, THC Nutrients, Xtreme Gardening, and Grotek. Whether you're looking to strengthen cell walls with silica, accelerate root development, increase flower density, or improve terpene and flavour profiles, our additive range covers every stage of the grow cycle.

Additives are designed to work alongside a base feed, not replace one. If you haven't settled on your main hydroponic nutrients yet, start with our Base Nutrients collection and come back here once your foundation is dialled in.

Melbourne-based with fast delivery across Australia.

Frequently Asked Questions

When should I start using additives?
Not on your first grow. Run a base nutrient only for your first full cycle so you have a clean baseline to compare against later. Once you've completed one grow on base nutrients alone, you'll know exactly what effect each additive is having.

Can I use multiple additives at the same time?
Yes, but introduce them one at a time across different grows rather than all at once. Running several new additives simultaneously makes it impossible to know which one helped or caused a problem.

What is the difference between a PK booster and a bloom nutrient?
A bloom nutrient is a base feed for the flowering stage. A PK booster is an additive used on top of your base bloom feed to give plants an extra surge of phosphorus and potassium during mid to late flower. They work together, not interchangeably. Our PK booster guide explains how and when to use one correctly.

Do additives ship fast within Australia?
Yes. All products ship from our Melbourne warehouse with fast tracked delivery Australia-wide. Most east coast orders arrive within 2 to 5 business days.