Choosing a growing medium shouldn’t feel like decoding a secret menu, but Pro-Mix names can definitely look that way at first.

The good news?
Once you know what each category is designed for, picking the right bag becomes easy.

This guide breaks down the Pro-Mix options by what you’re growing and what you need your soil to do: drainage, long-term container performance, germination success, or all-purpose planting.

Quick Glossary (in plain language)

Good drainage / high air porosity

Best when you want roots to breathe and hate soggy soil (great for many houseplants and container crops).

Biostimulant (Bacillus)

Beneficial bacteria that can help stimulate plant growth and support overall plant performance.

Mycorrhizae

Beneficial fungi that partner with roots to help plants build stronger root systems and improve nutrient/water uptake.

AGTIV names

REACH™ = includes mycorrhizae
AMPLIFY™ = includes biostimulant + mycorrhizae
STIMULATE™ = fine grade for germination/propagation (with biostimulant)

1) Good Drainage Mixes

These are your go-to choices when you want low water retention and lots of airflow around roots.

HP® AGTIV AMPLIFY™
(NEW – formerly HP® Biostimulant + Mycorrhizae)

Why you’d choose it: Good drainage, high air porosity, low water retention plus growth support.
What it includes: Bacillus (biostimulant) + mycorrhizae
Great for: growers who want fast root establishment and strong plant performance in a well-draining mix.

HP® AGTIV® REACH™
(formerly HP® Mycorrhizae)

Why you’d choose it: Good drainage, high air porosity, low water retention with root-support help.
What it includes: Mycorrhizae
Great for: those who want a well-draining mix with added root support, without the biostimulant.

2) Special Mixes (Hanging Baskets, Large Containers, Long-Term Crops)

These are designed for container growing where you need the mix to stay consistent longer, balancing airflow, drainage, and water-holding for bigger planters and longer timelines.

HPCC AGTIV® REACH™
(NEW formerly HPCC Mycorrhizae)

Why you’d choose it: Optimized air porosity + drainage + water retention for long-term container success.
What it includes: Mycorrhizae
Great for: hanging baskets, large containers, long-term crops where you want stability and strong roots.

MPO AGTIV® AMPLIFY™
(formerly MP Mycorrhizae Organik)

Why you’d choose it: A well-balanced air/water mix that’s approved for organic use.
What it includes: Mycorrhizae
Great for: organic-focused growers, raised beds/containers where you want a premium “performance” mix.

3) Germination & Propagation Mixes

These are fine-grade mixes built for the earliest and most delicate stage: starting seeds, plugs, and rooting young plants.

FPX AGTIV® STIMULATE™
(formerly FPX Biostimulant / S Biostimulant)

Why you’d choose it: Optimized growing environment for germination, plug production, and rooting.
What it includes: Bacillus (biostimulant)
Great for: growers who want top performance for plugs and propagation—especially if you’re starting lots of trays.

4) General Purpose Mixes

These are your reliable “most things will grow well in this” options.

PRO-MIX® BX

Why you’d choose it: A classic general-purpose base with quality sphagnum peat and perlite.
What it includes: No added biostimulant/mycorrhizae listed here, simple and dependable.
Great for: everyday potting, general containers, and a solid all-purpose base.

BX AGTIV® REACH™
(formerly BX Mycorrhizae™)

Why you’d choose it: The BX base you love, plus root-support benefits.
What it includes: Mycorrhizae
Great for: general potting when you want added root support and improved plant establishment.

BX AGTIV® AMPLIFY™
(NEW – formerly BX Biostimulant + Mycorrhizae)

Why you’d choose it: General-purpose base plus both growth and root support.
What it includes: Bacillus (biostimulant) + mycorrhizae
Great for: “I want the best all-around bag” for general containers and plantings.

How to Choose (Fast)

If you want the quickest “which bag do I grab?” answer:

I overwater / I want airflow / my plants hate wet feet → HP AGTIV (Good Drainage)
I’m doing hanging baskets or big planters that need stability → HPCC (Special)
I’m starting seeds or plugs → FPO or FPX (Germination/Propagation)
I want an all-purpose mix → BX
I want all-purpose + extra root help → BX AGTIV REACH
I want all-purpose + the full boost → BX AGTIV AMPLIFY

If you’re growing / your goal is…	Choose this Pro-Mix	Why
You want good drainage (roots hate wet feet, you tend to overwater, lots of airflow)	HP® AGTIV® REACH™	High air porosity + low water retention with mycorrhizae for stronger roots
You want good drainage + the full boost	HP® AGTIV® AMPLIFY™	Same well-draining HP base plus biostimulant (Bacillus) + mycorrhizae
You’re doing hanging baskets, large containers, or long-term crops	HPCC AGTIV® REACH™	Optimized air + drainage + water retention for containers that need to perform longer, plus mycorrhizae
You want a more balanced mix and it must be approved for organic use	MPO AGTIV® AMPLIFY™	Well-balanced air/water properties with mycorrhizae(organic-approved)
You’re starting herb + veggie seeds and want a fine mix for germination	FPO AGTIV® STIMULATE™	Fine grade peat/coir + fine perlite for germination, with biostimulant (Bacillus)
You’re doing seedling plugs + propagation/rooting young plants (high performance starts)	FPX AGTIV® STIMULATE™	Optimized for plug production + rooting, with biostimulant (Bacillus)
You want a general purpose “works for most things” mix	PRO-MIX® BX	Classic sphagnum peat + perlite base (simple and dependable)
You want general purpose + root support	BX AGTIV® REACH™	BX base with mycorrhizae to support root systems
You want general purpose + the full boost	BX AGTIV® AMPLIFY™	BX base plus biostimulant (Bacillus) + mycorrhizae

Need help picking the right Pro-Mix for your plant?

Tell us what you’re growing (houseplants, baskets, veggies, seedlings) and where it’s living (indoors/outdoors).

We’ll match you to the best bag for your goals, so your plants get the drainage, root support, and performance they need right from day one.