Jump Start Smart Float Grow Tray Refill Plugs (Bag of 55)

These plugs are designed specifically as drop-in replacements for the Jump Start Smart Float 55-Cell Grow Tray and are sized to fit its cell spaces precisely. While the plugs themselves can support germination outside the floating tray system, their primary design intent and guaranteed fit is with the Smart Float insert.

Drop the plugs into the tray cells and add water. For faster rooting, many growers place the tray on a Jump Start seedling heat mat. Once the plugs have absorbed moisture, they're ready to receive seeds or cuttings. No pre-soaking or pH adjustment is required before use.

Yes. When roots are visible at the base or sides of the plug, the plant is ready to move. Transfer the seedling or cutting with the plug intact — place the whole unit directly into your growing medium without separating the root mass from the plug. This approach minimizes transplant shock and preserves the root structure established during propagation.

The clearest sign is roots emerging from the bottom or sides of the plug, indicating the plant has established enough root mass to support life in a larger medium. For seedlings, look for the first set of true leaves developing above the seed leaves. Transplanting too early — before roots are visible — risks transplant failure; waiting until roots are clearly active improves success rates significantly.

That depends entirely on your cycle frequency. Each bag covers one full 55-cell tray run. If you're turning over a tray every two to three weeks, you'd go through roughly 17–26 packs per year at continuous operation. Many growers purchase a few bags at a time to ensure they're never waiting on supplies between propagation runs.