How do vertical ribs in the 72-cell tray improve root health?

Unlike standard smooth-walled trays, these feature vertical internal ribs that guide roots directly down toward the air-pruning slots. This prevents the 'root-spiraling' that leads to root-bound plants, ensuring a natural, downward-reaching root architecture.

Is it easy to remove seedlings from the 72 Cell punnet?

Yes. Because these trays are heavy-duty and injection-molded, they do not flex or crack when you push from the bottom to extract a seedling. This rigidity protects the delicate root ball during the transplanting process, significantly increasing survival rates.

Why is a 72-cell tray better for space-constrained growers?

The 72-cell configuration provides the perfect balance between root volume and density. It allows you to grow 72 robust seedlings in a single standard 1020 tray footprint, maximizing the efficiency of your grow lights and shelving.

Can these trays handle commercial-level sterilization?

Absolutely. These trays are built for the rigors of commercial farming. They are dishwasher safe and can withstand repeated cleaning with vinegar or bleach solutions without warping or losing their UV-protective properties.

Bootstrap Farmer 72 Cell Air Pruning Tray

Alternative to Soil Blocking
Do you enjoy the air pruning benefits of soil blocking but a sick of the mess? These heavy‑duty propagation trays farm trays allow for airflow above and below the soil, so newly established seedlings get optimal growing conditions for a strong start. Gain healthier root systems and stronger transplants using these air pruning block trays. Start all of your flowers, herbs, and vegetables in these seed-starting block trays. Also available in bright colors!

Benefits

Stronger, healthier root systems - Airstrips in each cell prune the roots to prevent root circling
Perfect for delicate starts - Includes large bottom holes for easy removal
Ample airflow - Air channels between each cell provide even air circulation

Dimensions - 50.3 cm x 25.0 cm x 5.9 cm

Individual Cell Dimensions- 3.5 cm from the top, 5.8 cm tall, 2.2 cm hole, and 2.5 cm at the bottom

Extra strength, heavy duty propagation trays to last a lifetime - Backed by a 2 Year Warranty
Compatible with our shallow 1020 trays or our deep 1020 trays for easy bottom-watering. Also available in colors!
Made from BPA-free, food-safe plastic using a Prime FDA Impact Resistant Polypropylene
Made in the USA
Available in black, green, orange, blue, pink, purple, and multi-color packs

How to Use Air Prune Seed Starting Trays
Fill trays with well-draining soil, taking care not to overfill. Lightly compress soil until firm but not compacted. Mist the soil lightly and plant seeds into the media. After planting, bottom-watering can commence using a 1020 shallow tray or deep 1020 tray.

Watch this video for filling these punnets