231 Deep Cell Seed Starting Tray (5-Pack) – Commercial 10x20 Injection-Molded Propagation Insert 20cc Deep Cells Air-Pruning Root Ribs Easy-Pull Seedlings Reusable 10+ Years Steam Sterilizable

- COMMERCIAL-GRADE INJECTION MOLDING ? Rigid 231-cell tray built for professional greenhouses and serious growers; outlasts flimsy thermoformed inserts with a 10+ year working life and multiple crop cycles per season. - AIR PRUNING + ROOT TRAINING RIBS ? Internal vertical ribs guide roots straight to the large drainage hole, eliminating root circling; seedlings develop dense, healthy root balls that pull easily and transplant with less shock. - 231 DEEP CELLS AT 20cc ? Precise tapered cells replace the standard 10x20 200-cell thermoform tray with 15% more plants per flat; deep-cell format ideal for vegetables, brassicas, onions, herbs, flowers, and tree seedlings. - STEAM STERILIZABLE & TRULY REUSABLE ? Sanitize between crops with zero damage to tray life or plant pulling; replaces 10+ disposable trays over its life, cutting plastic waste and cost per season. - STANDARD 10x20 FOOTPRINT, NESTING DESIGN ? Fits common nursery racks, greenhouse benches, humidity domes, and seed starting systems; trays nest for compact off-season storage in home gardens and commercial operations alike.

Product description

THE TRAYS PROFESSIONAL NURSERIES RUN FOR A DECADE

Founded by grower John Cooley in 1987, Proptek builds injection-molded propagation equipment for commercial growers who can't afford failed transplants or yearly tray replacement ? and some trays molded in 1987 are still in service today. Sold in 20+ countries, made in the USA, and now available to your greenhouse with no 600-tray minimum and no distributor required.

AIR PRUNING: Open cell bottoms air-prune the tap root naturally. Instead of circling, roots branch into a dense, fibrous root ball that establishes fast after transplant.

ROOT TRAINING RIBS: Patented internal ribs guide every root straight down to the drain hole. No root spiraling, no cell-wall embedding ? seedlings pull clean, first time, every time.

STEAM STERILIZABLE: Sanitize between crops with steam or disinfectant with zero damage to the tray. One Proptek tray outlives 10+ disposable thermoform trays.

THE 231 DEEP: 231 tapered cells at 20cc each on a standard 10x20 footprint ? 149.7 plants per square foot. Replaces a 200-cell thermoform tray with 15% more plants per flat. Deep-cell format suits Brussels sprouts, cabbage, cauliflower, celery, peppers, and tomato starts headed for field transplanting. Fits standard 1020 racks, benches, and humidity domes; nests for off-season storage; built for manual and machine transplanting.

BUY ONCE. GROW FOR A DECADE. Every Proptek tray is injection-molded in the USA from heavy-duty polypropylene in precise, tapered-cell geometry that thermoforming can't match. That's why commercial nurseries in 20+ countries specify Proptek ? and why your cost per seedling drops every season you reuse it.