The HC Companies Dillen 1801 Deep Traditional Insert - 18-Cell Black Nursery Insert - 21in x 10.5in x 3in

Standard-Footprint Insert With Extra Root Depth, 18-Cell

Switching to a deep-cell insert usually means switching flat systems too, which is disruptive when a bench is already set up around standard 1020 flats. The HC Companies Dillen 1801 Deep Traditional Insert avoids that trade-off, combining the standard 21in x 10.5in flat footprint with an extra-deep 3in cell profile that delivers more root volume per cell than a standard-depth 1801 insert.

Vacuum-formed from durable black plastic with precision-burned drainage holes and die-cut trims, this insert suits crops that benefit from deeper root development during germination and propagation without requiring a change in flat or bench configuration.

Key Features & Benefits

• Standard 1020 footprint with deep profile — 21in L x 10.5in W fits standard flats while the 3in depth adds significantly more root zone volume.
• 18-cell layout — standard arrangement for efficient bench utilization and accurate stand counts.
• Vacuum-formed construction — consistent wall thickness and cell geometry deliver predictable root development across every batch.
• Precision-burned drainage holes — reliable drainage and air pruning prevent waterlogging even with the added cell depth.
• 13oz total liquid volume — the deeper cell holds more growing medium and moisture, reducing watering frequency.

Who Should Use This

Growers producing perennials, larger annuals, or any crop that benefits from a deeper root zone during propagation will find the 1801 Deep a useful step up from standard-depth inserts, using existing standard 1020 flat inventory.

About The HC Companies

Headquartered in Twinsburg, Ohio, The HC Companies manufactures a wide range of plant containers and nursery inserts under legacy horticultural brand names including Dillen, supplying greenhouse and nursery operations nationwide.

Frequently Asked Questions

How does the 1801 Deep differ from the D1801 Standard Insert?

The 1801 Deep measures 21in x 10.5in x 3in versus the D1801 Standard at 21in x 10.5in x 2.25in. The deeper profile provides more root volume but uses the same standard 1020 flat footprint.

How many cells does the 1801 Deep hold?

18 cells with a total liquid volume of 13oz across the standard 1020 footprint. That volume is higher than a standard-depth 1801 insert due to the extra 0.75in of cell depth.

Will the 1801 Deep fit under standard dome covers?

The 3in cell depth is taller than standard-depth inserts. Measure dome or cover clearance before combining it with an existing propagation dome system.

What flats are compatible with the 1801 Deep?

Standard 1020 flats including TND10200, TWA10207, and TWA10200. Always verify flat interior dimensions for proper fit.