Q: What is a root trainer?
It's a reusable seed-starting system with deep, split cells that guide roots straight down and let you separate seedlings individually for transplanting.
AA757 – 28-Cell Deep-Root Training Set
A reliable, reusable system for starting seeds and cuttings, this set gives young plants the depth and structure they need to develop strong roots that are ready for transplanting. It includes seven four-cell deep-root strips (28 cells total), a sturdy base tray, a clear, ventilated plastic dome and instructions.
The four-cell strips split apart easily, allowing you to check root growth or remove individual plants for transplanting without disturbing neighboring seedlings. Roots are automatically air-pruned to encourage a dense root mass, while grooved sidewalls guide roots straight down to minimize spiralling. Seedlings slide out smoothly, avoiding damage to the root system and reducing transplant shock.
Each cell measures 4 3/4" deep by 1 1/2" square. The strips are designed to stand on their own or fit into the 14 3/4" × 9 1/4" × 4 7/8" deep tray. The clear dome lid helps regulate airflow and humidity for consistent growing conditions.
Dishwasher safe. Backed by a 10-year warranty.
Made in UK.
Additional strips are available separately.
It's a reusable seed-starting system with deep, split cells that guide roots straight down and let you separate seedlings individually for transplanting.
The set has 28 cells in total, from seven four-cell strips that stand alone or sit together in the included tray.
Open up the row and remove the sprout you want from the individual cell. The air-pruned root ball should slide out cleanly without touching neighboring cells.
Yes, the deep root training set is dishwasher safe, so you can clean it between batches and use it again each season.
It includes seven four-cell root-training strips, a sturdy base tray, a clear ventilated dome and instructions.
Yes, each four-cell strip stands on its own, so you can use just a few strips at a time instead of the full tray.
| Materials | Plastic |
| Dimensions | 14 3/4" × 9 1/4" × 4 7/8" deep tray; 8 1/4" long × 2" wide × 4 3/4" tall strip; 4 3/4" deep × 1 1/2" square cells |
| Capacity | 28 cells |
| Includes | Four-cell root-training strips; base tray; ventilated dome; instructions |
| Package Quantity | 1 set |
| Country of Origin | UK |
| Warranty | 10-year manufacturer's warranty; Lee Valley Satisfaction Guarantee (https://www.leevalley.com/en-ca/promo/guaranteeandreturns) |
Options:
Variations:
28-Cell Deep-Root Training Set
A reliable, reusable system for starting seeds and cuttings, this set gives young plants the depth and structure they need to develop strong roots that are ready for transplanting. It includes seven four-cell deep-root strips (28 cells total), a sturdy base tray, a clear, ventilated plastic dome and instructions.
The four-cell strips split apart easily, allowing you to check root growth or remove individual plants for transplanting without disturbing neighboring seedlings. Roots are automatically air-pruned to encourage a dense root mass, while grooved sidewalls guide roots straight down to minimize spiralling. Seedlings slide out smoothly, avoiding damage to the root system and reducing transplant shock.
Each cell measures 4 3/4" deep by 1 1/2" square. The strips are designed to stand on their own or fit into the 14 3/4" × 9 1/4" × 4 7/8" deep tray. The clear dome lid helps regulate airflow and humidity for consistent growing conditions.
Dishwasher safe. Backed by a 10-year warranty.
Made in UK.
Additional strips are available separately.
Choose an option to view item availability.
Choose an option to view item availability.
Choose an option to view item availability.
Choose an option to view item availability.
