Waiting for Beets on the Balcony

I planted some beets last week: Chioggia and Yellow. The Chioggia came up fast; all of them. But only a couple of the Yellow beets have germinated. The temperates this past week have been very hot. A heat wave actually. That could have been a factor. Anyhow, I planted some more seed and I'll see what happens. It would probably be better to wait another week or two to stagger the crops anyways. In between the two groups of beets I planted a few baby carrots which have started to sprout up also. The whole crop is planted in a 1'x3'x ~1' deep box up against the "rail" of my balcony in the sunniest spot I have available. I have some Bulls Blood seed here also and maybe some other variety. It's a few years old now but I might eventually try some of that at the end of the month in the spots where nothing comes up.