4-Cell Seed Starting Inserts (4-pack)

These heavy-duty 4-cell seed starting inserts are designed for growers who need extra depth and root volume during early plant development. Each insert provides four oversized planting cells that give seedlings more room to establish strong, healthy root systems before transplanting.

Eight inserts fit inside a standard 1020 propagation flat. This modular format makes them useful for seed starting, propagation, and transplant staging in both home gardens and commercial growing environments.

Made in the USA from durable, food-safe polypropylene, these inserts are built for repeated seasonal use. The deep-cell design combined with air-pruning features encourages strong lateral root growth while helping prevent root circling.

Product Features

• Made in the USA from BPA-free, FDA-compliant #5 polypropylene plastic
• Deep 4-cell configuration for extended early plant growth
• Large ¾-inch drainage opening for easy transplant removal and proper moisture flow
• Air-pruning slits support dense, fibrous root development
• Compatible with standard 1020 trays (8 inserts) and 1010 trays (4 inserts)
• Designed for long-term reuse across multiple growing cycles
• Ideal for Squash, Cucumbers,Tomatoes, peppers, and other transplant-heavy crops

Dimensions

Overall Insert Size

• 5¼" × 5¼" × 4" tall

Cell Dimensions

• Top opening: 2⅜"
• Tapers to: 1¼" at base
• Depth: 4"

Soil Capacity

• One insert holds ~1 quart total soil