Made of black poly-plastic, each cell offers good drainage and plenty of room to grow. Use them to germinate seeds, or transplant seedlings from seed flats into them to grow on before setting out into the garden. One 48-cell insert (which breaks into 8 6-cell packs) fits perfectly into our bottom tray, which acts as a water catcher and carrying unit.
If you are starting even more seeds, or would prefer a larger or smaller cell size, these inserts are also available in 36-cell (our largest size) and 72-cell (our smallest size), both of which also fit into the same bottom trays. Mix and match all you like for the best possible start for your garden!