RooTrimmer 18-Cell Deep Seed Starter Trays, 10-Pack 2.9" Deep 1020-Compatible Trays with Drainage

RooTrimmer 10 Pack 18 Cell 2.9" deep seed starter trays are rigid 1020-compatible nursery inserts designed to give seedlings more soil volume and drainage for longer, healthier early root development.

These deep, large-cell plastic trays let hobby growers, nursery operators and propagation enthusiasts start larger seeds or allow seedlings to remain in their cells longer before transplanting. Each tray measures 20" x 10" to fit standard 1020 flats and contains 18 tall cells with 2.9" depth (about 3" side length). Built from durable plastic about 1 mm thick, the trays include bottom drain holes and top guide channels to move water evenly between cells while helping avoid overwatering.

How do these deep cells help my seedlings compared with standard shallow trays?

Deeper cells increase the volume of growing medium available to each plant, giving roots more space to explore and store nutrients. That extra depth helps species with longer taproots or plants you plan to hold in trays longer before transplanting.

• 2.9" depth provides more soil and air space for root development.
• Bigger 3" x 3" side faces fit larger seed types and nursery starts.
• Allows longer nursery time without root binding for many vegetables and perennials.

Will these trays work with my existing 1020 flats and propagation setup?

Yes — each RooTrimmer tray is sized to insert into standard 20" x 10" (1020) flats used across hobby and commercial propagation. Their uniform dimensions keep trays stable in racks, benches and greenhouse benches.

• 20" x 10" outer dimensions match common 1020 flat standards.
• Rigid 1 mm plastic resists bending when filled and transported.
• Compatible with bench systems, heat mats and automated watering routines.

How do RooTrimmer trays manage water and drainage to prevent overwatering?

The trays include bottom drain holes in each cell plus top guide channels that help distribute water along the tray’s length so each cell receives moisture evenly. This design assists in removing excess water and reduces the risk of standing water that can stress young roots.

• Per-cell drainage holes allow excess water to escape.
• Surface guide channels direct water across cells for even wetting.
• Works with ebb-and-flow, bottom-watering, or hand-watering methods.

What materials and durability can I expect from these nursery inserts?

RooTrimmer trays are injection-molded from a sturdy plastic roughly 1 mm thick, designed to withstand repeated filling, moving and reuse across seasons. They are suitable for indoor propagation, greenhouse use and nursery benches; however, prolonged direct sunlight exposure should be avoided to prevent accelerated UV degradation.

• Durable plastic construction for multi-season use.
• Sturdy edges and cell walls for easier handling and transport.
• Store out of direct sunlight when not in use to extend lifespan.

Who this is for: These 18-cell deep trays are ideal for gardeners and growers who start larger seeds, need a longer in-tray nursery period before transplant, or want a more robust root environment than shallow plug trays provide. They fit well for home gardeners moving into small-scale propagation, market growers needing reliable 1020-compatible inserts, and greenhouse operators who want durable trays that drain well and support healthier early root systems.