"higgledy" wrote:

I picked the 1st crop from both broccoli and cauliflower. Since these
plants don't grow well in the heat, I am thinking of pulling the plants
out. But what can I plant in their place? I live in Maryland, zone 6.
Thank you.

Huh?? You should have enough time for another broccoli flower set.
Keep those plants there and start ny new crop you might try in-between
them. In a month or so, the brocolli may be finished. You can tell
the time to pull the plants because the flowerettes will be small and
almost immediately leggy.