4 Cell Plug Tray Inserts

USA Made 4-Cell Seed Starting Trays – Durable Air-Prune Inserts

Give your seedlings more room to grow with heavy-duty, reusable plug inserts.

These USA-made 4-cell seed starting trays are designed for crops that need extra depth and space, perfect for tomatoes, peppers, and other transplants. Each insert features air-prune technology with side channels that prevent root circling, encouraging stronger, healthier root systems.

Made from FDA-grade, BPA-free polypropylene (#5), these trays are built to last multiple seasons without cracking or warping. Eight inserts fit neatly inside a standard 1020 tray, while four inserts fit inside a 1010 tray. Available in a range of colors so you can easily organize or color-code your seedlings.

Key Features

• Made in the USA – Extra-strong, reusable inserts guaranteed to last at least 2 years

• Air-Prune Technology – Built-in side channels prevent root circling for healthier growth

• Extra-large ¾” drainage holes – Makes seedling removal easy and mess-free

• Tray compatibility – 8 inserts fit per 1020 tray; 4 inserts fit per 1010 tray

• Color options – Black, blue, green, purple, pink, orange, or multi-color packs

• Generous depth – Ideal for up-potting tomatoes, peppers, and other larger crops

• Food-safe polypropylene – FDA prime grade, BPA-free plastic for safe growing

• ❌ Note: Not compatible with 1020 and 1010 humidity domes due to snug fit

Dimensions

• Insert size: 5¼” × 5¼” × 4″ tall

• Each cell: 2⅜” wide at top, tapering to 1¼” at bottom

• Soil volume: ~1 cup per cell (1 quart total per 4-cell insert)

• Air-pruning slits: 2½” long × ⅛” wide

Why Growers Choose These Trays

• ✅ Designed for larger seedlings & deep-rooted crops

• ✅ Built with air-prune technology for vigorous plant development

• ✅ Durable enough to last many growing seasons

• ✅ Reusable, food-safe, and eco-friendly alternative to flimsy inserts

Stronger trays. Healthier seedlings. With these 4-cell air-pruning inserts, you’ll get reliable performance season after season while giving your plants the space they need to thrive.

Find even more variety in our Seed Starting Pots Collection