RooTrimmer 20-Cell 2.5" Square Seedling Trays — 3.5" Deep Plug Trays with 5 Flat Water-Collection Trays, Stackable Reusable Set

RooTrimmer 20-cell 2.5-inch square plug trays with matching flat water-collection trays give you a durable, reusable system for starting seeds, bottom-watering, and easy transplanting.

These nursery tray sets include five deep plug trays and five flat collection trays, each plug holding 20 independent 2.5" square cells that are 3.5" deep. The plug trays are designed with large bottom openings and separated cell bases to simplify lifting seedlings for transplanting, while the flat trays have no drainage holes so you can water from below or catch runoff. Lightweight yet sturdy, the trays stack for storage and make moving seedlings between indoors and outdoors quick and tidy.

How do these trays make transplanting seedlings easier?

The plug trays have spacious 0.9" bottom openings and deeper 3.5" cell walls, which let you remove an entire plug with minimal root disturbance. Cells are spaced to reduce root entanglement, so young plants hold together when lifted for transplant.

• Large bottom holes (0.9") speed removal of rooted plugs
• 3.5" cell depth supports longer pre-transplant growth
• 1.2" spacing between cell bases limits root fusion
• Stackable design for safe transport and storage

Can I bottom-water and avoid overwatering?

Yes — each set pairs a drained plug tray with a flat tray that has no holes, letting you stand the plugs in shallow water for capillary uptake. The plug trays also include slender drainage holes so excess water can escape when you water from above, helping prevent puddling and soggy media.

• Flat tray: no drainage holes, ideal for bottom-watering
• Plug tray: multiple thin drainage holes for excess runoff
• Deep cell walls keep water below the root crown when using side or bottom watering
• Use flat tray to catch overflow when moving plants outdoors

What are the dimensions and practical weight considerations?

Each plug tray measures 15" x 11" x 3.2" and weighs about 5 ounces, while each flat tray is 15" x 11" x 2.6" and about 6.3 ounces. One combined set (one plug tray plus one flat tray) weighs roughly 11.3 ounces, making the trays easy to carry when transporting multiple sets.

• Plug tray size: 15" x 11" x 3.2"; cell size 2.5"
• Flat tray size: 15" x 11" x 2.6"; no drainage holes
• Lightweight construction simplifies moving trays between locations
• Five sets included for larger seed-starting projects

How do the cell layout and drainage promote healthy seedlings?

The 20 independent cells are designed with spacing and bottom openings that increase aeration and reduce standing water at the base of each plug. That layout encourages even root growth and reduces the chance of roots becoming intertwined with adjacent plugs.

• Independent cells prevent root tangling across the tray
• Bottom openings improve air exchange and permit easy plug removal
• Drainage holes in plug tray allow quick release of excess water
• Deep cells accommodate longer root development before transplant

Who is this for: These RooTrimmer tray sets are suited to hobby gardeners, plant nurseries, and educators who need a reliable seed-starting system for multiple batches. They work well for those who prefer bottom-watering, want cleaner transport between indoor and outdoor spaces, or need deeper cells to grow seedlings longer before transplanting.