Give your cuttings and seedlings the perfect start in life with Grodan Starter Plugs— the trusted propagation solution of horticultural professionals worldwide.

Grodan Starter Plugs™ professional stone wool propagation plugs for hydroponics

Grodan Starter Plugs are designed for starting seedlings and rooting stem cuttings. The finely woven stone wool in the Starter Plug provides the perfect environment for young roots.

  • GRODAN plugs have excellent uniformity, strength and shape that provides the perfect basis for optimum germination and uniform seedling results.
  • The uniformity and reliability of GRODAN plugs provide a solid basis for automatic or manual processing, uniform germination and a crop that can be transplanted successfully.
  • GRODAN plugs have a uniform density, firmness and fibrous structure. This means that distribution of water, nutrients and pH-value is also uniform, which has a beneficial effect on germination results.

Want more information? Download the Grodan Propagation Technical Bulletin

Grodan A-OK Starter Plug

  • Square size plugs connected to each other at the top of the plug forming a sheet fitting a 10/20 tray
  • Plugs have a tapered bottom, for improved transplanting
  • Ideal plug for the growth of crops in hydroponic systems
  • Great to use for germinating seeds or starting cuttings in

Grodan AX Plugs

  • Same great benefits as the A-OK plugs, but are connected to each other at the bottom and are tapered towards the top
  • The wider bottom gives more stability when placed in a gutter/gully system

Grodan Macroplugs

  • Big round plug, ideal for cuttings or crops needing a longer germination stage
  • The bigger plug, will provide sufficient volume for initial root development

Grodan Starter Mini-Blocks

  • Block for effortless start-up of propagation
  • Excellent root growth throughout the block
  • Greater firmness for more manual handling

Grodan’s products are designed to work together as a complete, professional growing system allowing cultivators to handle and process young plants at much faster rates. The 1.5” size A-OK Starter Plugs™ fit snugly into the Gro-Smart tray which, in turn, can sit comfortably inside a standard size propagation dome.

The steps for successful propagation with A-OKs are easy:

1.Saturate the A-OK Starter Plug with 1.5 EC nutrient solution pH adjusted to 5.5 – 6.5 with a coarse spray or submerged for up to 1 minute and let drain.

2. Take cuttings that are no more than 14 days old, apply rooting solution to cut only and insert stem ½ inches into the saturated A-OK.If growing from seed, place one seed using clean tools into the perfectly sized hole of the saturated A-OK.Monitor the wet weight. Once the wet weight reaches 50% apply an irrigation with a nutrient solution of 1.5 EC and 5.5 pH. Drain excess to prevent mould, algae and disease.Allow your seedlings and cuttings adequate time to fully exploit all the stone wool in the A-OK Starter Plug™ before transplanting.

3. Transplant
When it comes to transplant time, moving your young plants on to the next stage couldn’t be easier! Grodan Gro-Blocks come prefabricated with the perfect sized hole to accommodate our A-OK Starter Plugs™. Soak the A-OK Starter Plug™ and Gro-Block in the same strength nutrient solution — typically 1.5 EC at pH 5.5. Once the A-OK Starter Plug is well rooted with strong white roots emerging from the plug, transplant the young plant  into the hole at the top of the Gro-Block.

Grodan takes the guesswork out of propagation, allowing you to generate batch after batch of consistent, healthy, and vigorous young plants.

Gro-Blocks Improved Dimensions (in) Dimensions (mm) Plugs/Package Plugs/Case
Grodan A-OK 1.5″ (36/40) 1.4 x 1.4 x 1.6 36 x 36 x 40 98 2,940
Grodan A-OK 2″ (50/40) 2 x 2 x 1.6 50 x 50 x 40 50 1,500
Grodan AX Plug (25/40) 1 x 1 x 1.6 25 x 25 x 40 200 6,000
Grodan Macroplug (36/40) 1.8 x 2 46 x 50 50 1,750
Grodan Macroplug (36/40) loose 1.8 x 2 46 x 50 2,000
Grodan Mini-Block 1.5″ (40/40) 1.6 x 1.6 x 1.6 40 x 40 x 40 45 2,250
Grodan Mini-Block 2″ (50/40) 2.0 x 2.0 x 2.0 50 x 50 x 50 24 1,440