Hydrofarm White Cut Kit Tray 11″x21″

The Hydrofarm White Cut Kit Tray measures 21" x 11" x 2½" and is built for seed and cutting propagation. Constructed from 100% virgin high-quality plastic at 0.90 mm thickness, the solid-bottom (no-holes) design holds moisture in place while the white finish reflects ambient light back toward cuttings and seedlings. Pair it with a Hydrofarm mesh insert to drain rockwool or peat cubes cleanly without dripping.

Hydrofarm White Cut Kit Tray Specifications

All specifications are sourced from the canonical product data (SKU CKTRAYW) and manufacturer-supplied attributes.

Why Choose the Hydrofarm White Cut Kit Tray

This tray is straightforward propagation equipment. Here is why growers reach for it rather than a generic black flat:

• No-holes solid bottom — Retains all nutrient solution and runoff within the tray. No dripping onto grow-room floors or shelving, and no premature drying of propagation cubes.
• White plastic for increased reflectivity — Light bounces off the tray surface back toward the underside of cuttings and seedling stems, improving light distribution in low-profile propagation environments.
• 0.90 mm wall thickness from 100% virgin material — Thicker than commodity-grade trays made from recycled resin. Maintains shape under the weight of saturated rockwool or peat blocks and resists cracking when stacked or transported.
• Standard 11" × 21" footprint — Fits standard propagation domes and humidity covers. Accepts most commercial plug inserts, mesh inserts, and 50-cell tray liners without modification.
• Compatible with Hydrofarm mesh insert — Elevated mesh layer lets excess solution drain below cuttings, preventing waterlogging while keeping the cubes moist — a clean, simple system for rockwool or peat-based propagation.

Best Uses for the Hydrofarm White Cut Kit Tray

The tray is a general-purpose propagation flat. It suits any grower who roots cuttings or germinates seeds before transplanting into a larger container or hydroponic system.

• Rockwool cube propagation — Place 1" or 1.5" rockwool starter cubes directly in the tray, flood-and-drain style, or set them on a mesh insert that sits inside this tray.
• Peat and coco plug trays — Use as a bottom-watering reservoir beneath 50-cell plug inserts. Fill the tray with a shallow layer of nutrient solution and allow plugs to wick moisture upward.
• Seedling germination — The solid bottom holds a thin layer of water for capillary watering. The white interior keeps the tray cooler under artificial lighting compared to dark-colored trays, which can raise root-zone temperatures.
• Clone tray staging — Pair with a humidity dome during the initial rooting phase. Once roots emerge, use the tray for early veg staging before transferring to fabric pots such as the Smart Pot 3-gallon or a larger Smart Pot 20-gallon for finishing.
• Soilless media conditioning — Pre-soak expanded clay, coco, or rockwool in this tray before loading into net pots or containers. The no-hole bottom contains runoff and excess solution.
• Commercial and home propagation — At a single-unit size, the tray works in home grow tents. At case quantities, it scales to commercial nursery and clone-room operations.

Compatibility

The 11" × 21" outer dimension is an industry-standard propagation flat size. It is designed to work with the following:

• Humidity domes — Standard 2" or 7" humidity domes with a 10" × 20" interior footprint fit directly over this tray. Verify the inner dimension of your dome before purchase; slight variations between manufacturers exist.
• Hydrofarm mesh insert — Hydrofarm's matching mesh insert (sold separately) drops into this tray and elevates cubes above the standing solution level, preventing oversaturation.
• 50-cell and 72-cell plug inserts — Standard nursery plug trays with an 11" × 21" outer lip rest on the tray sides and allow bottom watering. This is the same approach commercial greenhouses use for germination flats.
• Heat mats — The tray sits flat on standard propagation heat mats. The white plastic conducts heat evenly without the hot-spot issues sometimes seen in black trays that absorb more radiant heat from overhead lighting.
• Shelving and rack systems — Fits standard wire propagation shelving. Lightweight at 0.32 lb, even fully loaded with rockwool cubes and solution it remains manageable for single-person handling.

If you are building out a full propagation setup, consider pairing this tray with a growing media option such as Premier Pro-Mix HP with Mycorrhizae for transplanting rooted cuttings into a soilless medium.

Sources & Further Reading