Grodan plugs are known for their homogeneity and reliability.

They are the ideal basis for automated processing, uniform germination and a high success rate with pricking out.

The shape and firmness of the plugs are of a quality that makes processing significantly easier – whether that processing is mechanical or manual.

Every Grodan plug has a uniform density, firmness and fibrous structure. This means that the distribution of water, nutrients and pH-value is also uniform, which has a beneficial effect on germination results.

The fibrous structure, which is predominantly vertical, gives the plugs their resilience.

One of the practical advantages when pricking out is that Grodan plugs retain their shape, make good contact with the block and guarantee fast root growth.

A good balance between small and large pores in the stone wool ensures an ideal air-to-water ratio in the plugs. The fibrous structure creates a balanced distribution of the feed-water throughout the entire plug.

In summary, the homogeneity, flexibility, shape and firmness of Grodan plugs create the foundation for the optimum germination process and a uniform sowing result.

  • Improved homogeneity
  • Optimum strength and flexibility
  • Ideal air/water balance
  • Consistent shape of the seed hole
  • Identically shaped plugs
  • Root growth throughout the entire plug
  • Suitable for germinating vegetable and ornamental crops
  • Available in various types of trays
  • Seed hole available in 2 variants
  • Pores are evenly distributed (air is not a limiting factor)
  • Predominantly vertical fibre structure
  • Suitable for manual and automatic processing

Pictured above

Grodan Plantop Plugs in Styrofoam trays come in two layouts.

The Standard / ‘Dutch’ style tray has a gap every 5 rows (pictured), while the French style has no gaps. Same # of plugs and dimensions in each.

These are the go-to propagation system for hi-tech growers worldwide and are excellent for automated seedling and transplanting systems.

Grodan Plantop Styrofoam Trays

  • Also known as Kiem plugs and Funnel plugs
  • 240 plugs in each Styrofoam tray
  • 12 trays / carton
  • Two layouts
    • Dutch style standard tray has a gap every 5 rows (pictured above)
    • French style has no gaps
    • Same # of plugs and dimensions in each

Other Grodan Propagation Plugs & Granulate (in trays, sheets, strips and loose)

AO Plugs loose filled in SBS black trays

  • 36 x 36 x 40 mm plugs
  • Either no holes or 6 x 15 mm holes
  • 77 plugs per tray
  • 18 tray / ctn = 1,386 plugs / ctn
  • Tray size 550 x 31 x 53 mm
  • SBS’ = Single Block System

AO Plugs loose filled in SBS black trays

  • 25 x 25 x 40 mm plugs
  • 6 x 15 mm holes
  • 150 plugs per tray
  • 18 tray / ctn = 2,700 plugs / ctn

AO Plug sheets w/- tapered shape getting smaller towards the base.

  • Square plugs connected to each other at the top of the plug forming a sheet that fits 10″/20″ tray.
  • Either 25x25x40 mm plugs = 200 p/sheet = 6,000 p/ctn
  • OR, 36x36x40 mm plugs = 98 p/sheet = 2940 p/ctn
  • Hole size options: no holes, 6×15, 10×10 or 15×15 mm

AO TACO Plug sheets w/- straight shape down to the base

  • Square plugs connected to each other at the top of the plug forming a sheet that fits 10″/20″ tray.
  • 504 x 252 mm sheet size
  • Either 25x25x40 mm plugs = 200 p/sheet = 6,000 p/ctn
  • OR 36x36x60 mm plugs = 98 p/sheet = 1,980 p/ctn
  • Hole size options: no holes or 10×10 mm

AX Plug sheets

  • Same great benefits as the AO plugs, only these plugs are connected to each other at the bottom and are tapered
    towards the top
  • Due to the wider bottom gives more stability when placed in a gutter/gully system
  • 25x25x40 mm plugs = 200 p/sheet = 6,000 p/ctn
  • 10×10 mm hole size
  • See picture above
  • Non stocked item in Australia = special orders only

MM 40/40 blocks

  • 40 x 40 x 40 mm wrapped blocks
  • Hole size: 6 x 15 mm
  • Strip of 600 x 40 mm (15 x mm 40/40’s)
  • 2,250 / ctn

MM 50/50 blocks

  • 50 x 50 x 50 mm wrapped blocks
  • Hole size: 10 x 10 mm
  • Strip of 600 x 50 mm (12 x mm 50/50’s)
  • 1,152 / ctn


  • 1 x 1 x 1 cm (150 L)
  • Loose substrate to fill containers
  • Porous, dry substrate that retains its structure when irrigated
  • Small cubes that stack on top of each other, leaving air space in between them to promote root growth

Macro Plugs

  • 36 x 36 x 40mm
  • 2,000 plugs / ctn (Loose)
  • Cylindrical with a slit for easy insertion of cuttings or crops needing a longer germination stage (V-cut on the side of plug)
  • The bigger plug provides extra volume for root development
  • Well suited for the GroSmart Trays to keep the plug firmly closed around the cutting stem

Gro Smart Trays

  • 78 cells in a 50 x 24 x 5 cm tray
  • 5 trays / ctn
  • This durable Grodan tray has double-sided features
  • 1) Use the 78-cell side for individual AO plugs or round Macro plugs
  • 2) Use the mesh side for plug sheets or MM 40/40 blocks
  • The tray fits in a standard 25 x 50 cm drip tray keeping the Grodan slightly elevated

Cress Plates

  • 49.5 x 24 x 1cm sheet – fits a 10 x 20cm tray – 95 sheets/ctn
  • 60x50x1cm – 50 sheets/ctn
  • 12x5x1cm – 1,900 mini sheets/ctn
  • For micro greens & baby leaf crops
  • Thinnest Grodan product available
  • Uniform WC throughout product
  • Quick and easy germination with even crop development


  • 20 kg Coarse Grade (110x60x30cm)
  • 25 kg Fine Grade (135x65x20cm)
  • Compressed 20kg or 25kg bales
  • Almost flock-like or sheep’s wool-like, that is practical as a stand-alone substrate or mixed in with other media or potting mixes to increase water retention
  • Popular with orchid growers as it does not biodegrade like bark chips that need to be replaced every few years
  • Higher WC and stronger capillarity action than sphagnum or coco peat, and doesn’t compact over time
  • Also used as a water-filtration medium