Grodan Cress Plate | 20in - Bare Sheets - 19.5in x 9.4in x 0.4in

Thin-Profile Stonewool Sheet for Uniform Germination

Uneven moisture across a germination tray shows up later as an uneven stand of seedlings, which is a hard problem to fix once it's underway. Grodan Cress Plate is a thin stonewool sheet manufactured to a uniform density from edge to edge, so water levels stay consistent across the whole plate rather than pooling in some spots and running dry in others.

Sized at 19.5in x 9.4in x 0.4in and sold as bare sheets, this plate fits growers who want a flat, thin germination surface rather than individual cells or blocks.

Key Features & Benefits

• Uniform Density — engineered so water levels stay consistent from edge to edge of the sheet.
• Thin 0.4in Profile — a shallow format suited to germination rather than full-cycle root development.
• 19.5in x 9.4in Bare Sheet — sold flat and uncut, ready to be sized to a grower's tray or bench layout.
• Even Crop Emergence — consistent moisture across the sheet supports a more uniform germination stand.

Who Should Use Grodan Cress Plate

Growers germinating cress, microgreens, or other small seed crops that benefit from a thin, evenly moist stonewool surface are the fit for the Cress Plate, rather than growers needing individual propagation cells.

About Grodan

Grodan has manufactured stonewool growing media since pioneering the technique in 1969, and operates today as part of ROCKWOOL Group, applying the same engineered-fiber process across germination sheets like the Cress Plate as it does in its larger blocks and slabs.

Frequently Asked Questions

What is the Cress Plate used for?

It's a thin stonewool sheet designed for germinating small seed crops such as cress and microgreens, where an even, consistently moist surface matters more than individual cell depth. Its uniform density is what keeps that moisture level consistent across the whole sheet.

How is the Cress Plate different from a Gro-Block?

The Cress Plate is a thin, flat 0.4in sheet meant for germination, while Gro-Blocks are deeper, individual blocks meant to carry a plant through rooting and beyond. Growers typically move seedlings off the Cress Plate before long-term root development begins.

How do I prepare the Cress Plate before sowing?

Pre-wet the sheet evenly with water before sowing seed on the surface, since the plate's uniform density is designed to distribute that moisture consistently. Avoid oversaturating one section, which can offset the sheet's built-in evenness.

Does the Cress Plate come pre-cut into sections?

No, it ships as bare, uncut sheets at 19.5in x 9.4in. Growers size or cut it to fit their own trays or bench layout.