I'm new to Earthbox but have been gardening for a few years. I want to plant beet seeds this Spring. The conventional method is to sow the seeds in rows and to eventually thin the seedlings to the desired distances. How do I do this in an Earthbox? Do I sow the seeds under the mulch cover and then cut holes for the seedlings that I will eventually keep, or do I sow the seeds in an uncovered Earthbox and place the mulch cover over the seedlings? I do not have the space or facilities to start the seeds indoors. Any advice would be very welcome. Thanks in advance.