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  • Seed Trays
  • 4 Cell Plug Tray Inserts

    6 reviews

    USA Made 4 Cell Trays in Color!

    Proudly made in the USA, these larger 4-cell plug inserts are deeper for growing varieties of crops that need a little more room. Eight of these removable inserts fit in a Bootstrap Farmer 1020 tray. Made out of food-safe, heavy-duty polypropylene plastic and built to last many seasons. Color code your seedlings in these insert plug trays.

    Available in black, blue, green, purple, pink, orange, and multi-color packs.


    • Made from FDA Prime Grade Extra Strength Polypropylene (#5 BPA free) plastic
    • Extra Large 3/4" Drainage Hole makes for an effortless seedling removal. 
    • These 4 Cell Inserts are designed with Air Prune technology. Air channels are added on each side to prevent root circling. Air-pruned roots are shown to provide healthier and more vigorous growth. 
    • Proudly made in the USA, our Seed trays are guaranteed to last at least two years.
    • Eight inserts fit per 1020 tray, 4 inserts fit in a 1010
    • Perfect for up-potting peppers and tomatoes.


    • Seed tray insert 5 1/4" x 5 1/4" x 4" tall 
    • Each cell in the tray insert is 2 3/8" on top, which tapers down to 1 1/4" at the bottom.
    • Air pruning slits measure - 2 1/2" long -  slit width is 1/8"


    Free shipping on orders over $49 to Contiguous US

    Shipping Policy

    Most products will ship from our facility in 1 to 2 business days after the order is placed.  Express shipments placed after 12PM EST will be shipped out next business day. Full details can be found on our Shipping Policy Page

    Returns Policy

    Returns can be made on most products within 30 days of purchase. After 30 days we unable to offer a refund or exchange. Certain products are non-returnable. For full details visit our Returns Policy


    Ask a Question
    • This is about the quantity...... size = 40 is that 40 - 4 cell inserts or 10 - 4 cell inserts ?

      It is 40 of the 4-cell inserts.

    Customer Reviews
    5.0 Based on 6 Reviews
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    United States

    Plastic worth using because it will last

    I’m just now beginning seed starting for this season, using the 6 cell plug tray inserts to germinate seeds and planning on using these 4 cell plug tray inserts to up-pot seedlings. I feel like the Bootstrap Farmer products are an investment in the future. We have begun replacing flimsy plastics in our community garden with these more sustainable options. Definitely will get more!

    Ted M.
    United States United States

    Great company, great products. And I love the Bootstrap podcast!

    I have not yet used my 4-cell trays, but plan to use them for potting up my indoor tomato and pepper seedlings in the next week or two. I think they will work perfectly.

    United States United States

    Excellent for starting peppers

    Started hot and sweet pepper seeds 2 weeks ago and they have already germinated. Great for bottom watering.

    TED H.
    United States United States

    Great experience

    The tray inserts are tough and should last a long time. They will make better starting trays for the larger plants that I start. With the air pruning slots, there will be less stress when I transplant. You’ll definitely want to use them with the deeper trays. They were shipped quickly and arrived in great shape. I do like buying from this company, they listen to their customers and produce/have products that a person can feel good about investing in.

    Noel H.
    United States United States


    Have been using the smaller 6 cell version. These larger 4 cell version are what I requested, wished for, and need. Relatively heavy duty units should last many seasons. Just a home gardener. Probably will not be in need for awhile. 5 Star value. N of 47degrees. It is indoors under the grow light season. Planted my normal indoor veggies along with a few test items using these cell plugs. Larger cells should mean seed to harvest with no need to transplant to larger containers.