While cross pollination is a thing, it doesn't have to be a bad thing.
At my house... I grow out everything, even the seeds that come from the hybrid produce from the store.
Your main troubles are going to be the clod weather coming....
Even that might not be over problematic, when light frosts are predicted, I go out and toss bed sheets over everything that is still producing.... And... Like you, I have cantelope and watermelon seedlings just up... Ima set them out n hope fer the best.
