Growfoam® are revolutionary foam-based substrates that offer a multitude of eco-friendly benefits for hobbyists and commercial hydroponic growers alike.

The substrate is 100% biodegradable, clean, peat-free & soil-free handling, with a competitive performance versus organic material.

A sustainable choice with a carbon-neutral footprint, produced with no microplastics and no PFA’s, they are completely free of waste. Growfoam plugs are fully compostable via industrial and home methods. TUV Industrial Composting Certified.

Two styles of Growfoam® plugs are available from ZipGrow. 

Each plug measures 21mm x 35mm – the same size as a standard plug and fits into standard seed trays.

O1 sized plugs are best suited for-

Individual Seed Crops

Pelleted Seeds

Individual Plant Sites

Recommended plants:

Head Lettuce 

Bok Choy 

Romaine 

Basil 

Sage

Kale 

Kohlrabi 

Fennel Parsley 

Swiss Chard Collard Greens

Chives

Peppers

Tomatoes

03 sized Growfoam® plugs for multi-seed crops can be found here

Note that most crops will grow in either O1 or O3 style plugs, but by selecting the specific type best suited for your crops you will simplify the seeding process and produce better consistency.

GROWFOAM® substrates are suited for automated and manual DFT, aeroponics, NFT, deep water culture, gutter and float systems, and are fully compatible with ZipGrow technologies. They guarantee no soil in filters – ever.

Download the Growfoam®guide here.

Watch How To Plant a ZipGrow™ Tower