fruitless tomato plants

Tomato flowers need to be visited by insects to pollinate them, so if they are in a greenhouse, either use a small paintbrush from flower to flower, or give each stem a little shake each day which will disperse pollen onto the flowers. Sorry I can't advise on squashes, I haven't ever grown them.

You may be taking way too good of care of your plants.
Also Movement of plants is important to pollinate also.
We shake as we are continuously pruning throughout the Tomato season

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