Hi newbie here, with a question. Can you plant squash, cucumbers and melons close together if you are not planning on saving seed? Will that affect the current seasons fruit? Thanks for your help. Zita
If you are not planning on saving the seeds, you can safely plant any variety of those together. Squash will not cross-pollinate with melons or cucumbers. Melons will not cross-pollinate with cucumbers.
Different varieties of squash will cross-pollinate with certain other things. Different varieties of melons will cross-pollinate with each other, though watermelon will not cross-pollinate with muskmelon. Different varieties of cucumbers will cross-pollinate with other cucumbers. That still does not matter if you are not saving the seeds. Cross-pollination will not affect the flavor, size, or production of this year's crop. You can plant different varieties of squash together if you want to, for example. It will not matter to this year's crop.
This article has a chart that does a real good job of explaining what will cross-pollinate if you want to save seeds, but that is totally irrelevent to you if you are not saving seeds.