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

Hydrofarm 50-Cell Square Plug Flat Insert — for 10 x 20 in Trays

The 50-cell square plug flat insert provides larger individual cells than the 72-cell version — each cell has more volume to support larger propagation plugs, bigger cuttings, or crops that benefit from more initial root space before transplanting. At 50 cells per tray, the CK64005 is well suited for growers propagating larger cuttings or working with bigger plug sizes.

Like all Hydrofarm Cut Kit inserts, this tray fits the Cut Kit Tray (CKTRAY) and all standard 10 x 20 in seed flats — making it a flexible addition to any existing propagation system. Pair with a humidity dome and heat mat for optimal germination and rooting conditions.

Key Features & Benefits

• 50 square cells — 50 cells per insert provide more cell volume per plant than the 72-cell version — for larger cuttings and plugs.
• Square cell shape — square cells accommodate square coco plugs, rockwool cubes, and loose soil or soilless media.
• Fits 10 x 20 in trays — compatible with the Hydrofarm Cut Kit Tray and all standard 10 x 20 in seed flats.
• More root volume per cell — larger cells give roots more room to develop before transplanting.
• Reusable plastic construction — durable for repeated use across multiple propagation cycles.

Who Should Use This Insert

Growers propagating larger cuttings, using larger plug sizes, or working with crops that benefit from more root volume during propagation — who still want a standard 10 x 20 in tray format.

Selecting Cell Count — Density vs. Root Volume

Cell count in a flat insert directly affects individual cell size: more cells means smaller cells; fewer cells means larger cells. For small seeds and seedlings that will be transplanted quickly, 72-cell density (CK64002SQ) maximizes propagation throughput per tray. For larger cuttings or crops with slower root development that benefit from more media volume, the 50-cell insert (CK64005) allows more root development per plant before transplanting. Most growers keep both on hand for different crops.

Frequently Asked Questions

How does this differ from the 72-cell insert?

The CK64005 has 50 cells instead of 72, giving each cell more individual volume. This makes it suitable for larger cuttings, bigger plugs, or crops that benefit from more root space during propagation.

What plugs fit this insert?

Square coco plugs, square rockwool cubes, or cells filled with soil or soilless media. The square cell shape accommodates the most common square propagation plug formats.

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 and sanitize between propagation cycles. The durable plastic allows multiple uses per insert.

Can I use a humidity dome with this insert?

Yes. Place the tray and insert under a Hydrofarm humidity dome (CK64001 for 2 in or CK64081 for 7.5 in) to retain moisture and heat during propagation.