Super Sprouter 50 Cell Square Plug Insert | Fits a 10 x 20 Flat

What Fits a 50 Cell Plug Tray, Cell by Cell

The insert measures 19.7 in long, 9.6 in wide and 1.6 in deep, and those are the numbers that matter here. Nobody publishes a cell dimension for this part, so it has to be worked out from the tray. Fifty cells across that footprint sit in a ten by five grid. Divide it through and each cell is a shade under two inches square, with the 1.6 in depth as the rooting volume. That puts it in useful company. A Grodan A-OK stonewool plug at one and a half inches drops straight in with room around it. A coco plug of the same size does too, and so does a compressed cube. Loose medium works as well, whether that is a potting mix or a soilless blend. The insert is not a tray in its own right. It has no reservoir, so it sits inside a flat and drains into it. Fit is the one thing Super Sprouter are explicit about, and the answer is all standard flats. One insert weighs a fifth of a pound, and the trade case runs seventy of them at a little under twenty pounds.

Choosing a 50 Cell Seed Tray Over a 72 Cell One

Fifty cells or seventy two in the same footprint is a real decision rather than a preference. Super Sprouter make both of them. More cells means more starts per flat and less medium in each one. Fewer cells means a bigger root ball before anything has to be moved on. For seed that germinates fast and goes out early, the denser tray wins on count alone. Cuttings are a different proposition entirely. They sit under a dome for two or three weeks and build real root mass, so the larger cell is what avoids a root-bound plug. This insert sits on the larger-cell side of that choice. There is a second reason to prefer fewer cells and it is about water rather than roots. A small cell dries out faster. A tray of fifty holds its moisture more evenly than a tray of seventy two under the same light. That matters most in the first week, when one dry corner costs you a whole row of starts. Put a no-holes flat underneath and a vented dome over the top and the propagation stack is finished.

Key Features

• Fifty square cells: In a ten by five grid across the standard insert footprint.
• Close to two inches a cell: Calculated from the published 19.7 by 9.6 in dimensions.
• 1.6 in deep: Which is the rooting volume each cell actually gives a start.
• Plugs or loose medium: Coco plugs, stonewool plugs, potting mix or a soilless blend.
• Needs a flat under it: The insert has no reservoir and drains into the tray below.
• Fits all standard flats: Which is the ten by twenty footprint the whole trade uses.
• A fifth of a pound: Light enough that a stack of them costs nothing to store.
• Seventy to a trade case: A little under twenty pounds for the full case of inserts.

Technical Specifications