Grodan PRO A-OK Starter Plugs 1.5 in, Unwrapped | 30 Sheets, 2,940 Plugs

Grodan PRO A-OK Starter Plugs in a Bulk Propagation Carton

This is the propagation-room format of the A-OK 36/40, with 30 sheets in one carton and 2,940 stone wool plugs in all. Each sheet carries 98 plugs measuring 36 x 36 x 40 mm, joined at the top in a 7 x 14 grid. A sheet lands in a standard 10 x 20 in flat with no trimming. The carton ships bulk, without retail wrapping or labels, and measures about 24.8 x 20.8 x 20.5 in at 28.5 lb. Uniform density and firmness let the sheets move through manual handling or a mechanical seeder without crumbling. The same uniformity carries water, nutrients and pH evenly through every plug on the bench. Condition the sheets in a balanced nutrient solution at an EC of at least 1.5 mS/cm and a pH of 5.5 to 6.5. Soak them for several minutes, or run a coarse spray over them in several passes, then let them drain. Weigh sheets from different benches to confirm the whole batch saturated evenly. The plug suits lettuce, leafy greens and herbs in hydroponics, and any seed or cutting.

Unwrapped Sheets for a Fast-Moving Propagation Room

Unwrapped sheets come out of the carton ready to condition, with no film to strip on a busy sowing day. The trade-off is protection, since an opened carton leaves the remaining sheets exposed to dust and drying. Close it between sessions and store it off the floor in a clean, dry space. Tapered plug bases let each sheet tear apart cleanly when it is time to block on. Record tray weights after sowing, because weight is the fastest guide to irrigation timing across many trays. Stone wool holds more water than a young root needs, so light, frequent irrigation keeps oxygen in the plug. Cuttings need high humidity at first, with domes vented a little more each day as roots form. A well-rooted plug goes into a fully saturated block, followed by generous watering for a few days. Leafy greens can skip the block and go straight into an NFT channel or a raft. Every sheet behaves the same as the last, which keeps a weekly sowing schedule predictable.

Key Features

• 2,940 Plugs Per Carton: Thirty sheets of 98 for continuous sowing in a propagation room.
• Unwrapped Bulk Pack: Sheets come out ready to condition, with no film to strip.
• 36/40 Format: Each plug measures 36 x 36 x 40 mm, joined at the top in a 7 x 14 sheet.
• Manual or Mechanical Handling: Uniform density and firmness keep sheets intact through a seeder or by hand.
• Tapered Base: Plugs tear apart cleanly from the sheet and seat firmly in a block.
• Fits a 10 x 20 Tray: Each sheet drops into a standard propagation flat without trimming.

Technical Specifications