Squash blossoms are a delicate edible flower that can be eaten raw or cooked. They are also used in some recipes as an ornamental garnish.
However, there is a debate on whether or not squash blossoms should be removed from the squash plant before it is picked because some people believe they can spread diseases to other crops.
Squash plants which have already flowered are usually more susceptible to disease, so removing the blossoms before picking might reduce this risk.
On the other hand, if you do decide to let them grow, there are always options of squashing the flowers off by hand before cutting them out of your squash with a sharp knife.