Thoroughly clean them out and poke a number of drainage holes inside their undersides. They are really usually substantial adequate to house a few modest seedlings for any few weeks. Ultimately, seedlings will must be transplanted into their own individual pots.  Plug trays, Conversely, are flatter containers with specific pockets (or https://how-to-propagate-plants44320.fare-blog.com/32565584/5-simple-techniques-for-plant-propagation