Cut Kit Tray(10″ x 20″ I.D.)

The Hydrofarm Cut Kit Tray (10" x 20" I.D.) is a standard propagation flat designed for seed starting and cutting propagation. Also referred to as a flat, it features solid walls with no drainage holes, making it suitable for use as a humidity tray or as the base reservoir beneath a mesh insert. At 21" x 11" x 2½", it fits the widely used 10×20 footprint common to propagation domes, inserts, and heat mats.

Cut Kit Tray Specifications

Dimensions and construction details drawn from manufacturer data.

Why Choose the Cut Kit Tray

The Cut Kit Tray is a straightforward propagation flat with a specific design purpose: it holds water, not drains it. That solid-bottom construction is what sets it apart from trays with pre-punched holes. Here is what the tray offers based on manufacturer specifications:

• No drainage holes: The solid bottom retains water, making this tray useful as a humidity reservoir beneath a mesh insert or as a bottom-watering catch tray for plugs, cubes, and starter cells.
• Compatible with the Hydrofarm mesh insert: The manufacturer explicitly notes that when paired with a mesh insert, the cut kit tray makes cube draining simple and mess-free. The mesh insert sits above standing water, keeping the media moist without waterlogging it.
• Standard 10×20 footprint: At 21" x 11" outer dimensions with a 10" x 20" interior, this tray accepts standard propagation domes, heat mats, and cell inserts designed for the 10×20 format — the most widely used size in commercial and hobby propagation.
• Reusable construction: The tray is listed as reusable, making it suitable for repeated propagation cycles with proper cleaning between uses.
• Light weight: At 0.32 lb, the tray is easy to handle and stack when not in use.

Best Uses for the Cut Kit Tray

The Cut Kit Tray suits setups where water containment — not drainage — is the priority. It works well in the following roles:

• Propagation flat for cuttings: Lay rockwool cubes, rooting plugs, or foam cubes directly in the tray when starting cuttings. The solid bottom keeps water available at the base of the media.
• Seed starting flat: Use as a holding tray for seed-starting cells, peat pellets, or plug trays during germination. Bottom-watering through the tray reduces disturbance to developing seedlings.
• Mesh insert base: Place a matching Hydrofarm mesh insert into the tray. The mesh elevates cubes or plugs above standing nutrient solution, providing passive wicking without submersion. This is the primary recommended configuration per the manufacturer description.
• Humidity tray: Fill with a shallow layer of water and place under potted cuttings to raise ambient humidity around rooting plants without saturating the root zone.
• Transplant staging: Use as a work surface or temporary staging flat when transplanting seedlings from plugs into larger containers such as a 3-gallon Smart Pot or similar grow container.
• Drip-catch tray: Place beneath small potted plants in grow tents or on benches to catch runoff and prevent water damage to surfaces.

The 10×20 format makes this tray compatible with a wide range of standard accessories. Growers who use fabric containers in their main grow space often keep a set of cut kit trays on hand specifically for the propagation bench.

Sources & Further Reading