72-Cell Square Plug Flat Insert, for Standard 10 x 20 in

Hydrofarm 72-Cell Square Plug Flat Insert — for 10 x 20 in Trays

Square cell inserts are the preferred choice when working with square rockwool cubes, square coco plugs, or when filling cells with loose growing media. The square geometry uses tray space more efficiently than round cells, and a square cell shape provides stable, snug support for square propagation plugs throughout the germination and rooting process.

This 72-cell square insert fits the Hydrofarm Cut Kit Tray and all standard 10 x 20 in seed flats, making it compatible with most existing propagation setups. Use with a humidity dome and optional heat mat to create an optimal germination and rooting environment.

Key Features & Benefits

• 72 square cells — 72 individual square cells per insert for high-density propagation in a 10 x 20 in tray footprint.
• Square cell shape — square cells provide a snug, stable fit for square coco plugs, rockwool cubes, and loose growing media.
• Fits 10 x 20 in trays — compatible with the Hydrofarm Cut Kit Tray and all standard 10 x 20 in seed flats.
• Versatile media compatibility — accepts square coco plugs, rockwool cubes, soil, or soilless growing mixes.
• Reusable plastic construction — durable plastic for multiple propagation cycles.

Who Should Use This Insert

Growers using square rockwool cubes, square coco plugs, or loose growing media for seed starting or cutting propagation in standard 10 x 20 in trays at 72-cell density.

72-Cell vs. 50-Cell — Choosing the Right Density

The 72-cell insert (CK64002SQ) provides the highest propagation density in a 10 x 20 in format — ideal for seeds and small cuttings where individual plant size is small. The 50-cell insert (CK64005) provides larger individual cells, giving each plant more root volume during propagation — better for larger cuttings or crops that benefit from more initial root space before transplanting. Match cell count to your typical plug size and crop type.

Frequently Asked Questions

What plugs fit this insert?

The CK64002SQ is designed for square coco plugs and square rockwool cubes. Cells can also be filled with soil or soilless growing mixes for seed starting.

What is the difference between CK64002 and CK64002SQ?

The CK64002 has round cells (for round plugs); the CK64002SQ has square cells (for square plugs and cubes). Both are 72-cell and fit standard 10 x 20 in trays.

What trays does this insert fit?

Fits the Hydrofarm Cut Kit Tray (CKTRAY) and all standard 10 x 20 in seed flats.

Is this insert reusable?

Yes. Rinse between uses and sanitize as needed between propagation cycles.

Can I use a humidity dome with this insert?

Yes. The insert is designed to be used inside a 10 x 20 in tray with a standard vented humidity dome such as the Hydrofarm CK64001 (2 in) or CK64081 (7.5 in) placed over the tray.