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I planted a cucumber plant from seed, actually I planted two seeds (just in case one didn't work) and now both of them are growing well! They are in a pot that is only big enough for one of the plants, and I'm afraid of thinning them, in case the other one dies...should I attempt a transplant of one of them to another pot? Or would letting it see how crowded it gets be better? Thanks a lot

If the plants are still relatively small, you're chances of transplanting one of them is better. If the plant is longer than about 7 to 8 inches long, or has produced some extensive runners or even blooms already - you'd probably be better off just leaving them be.

They aren't very big yet. Still only about five or so inches high. I will try transplanting one thanks so much for your help!!!

FYI - Just to add - you may want to also use a trellis in the pot so there is more space for the cucumbers to grow - upwards. I once planted a row of cucumbers against a south side wall and secured a net behind them and they flourished. I was surprised. I had read this was a possibility but had not tried it before.

Also -if you do this, you may have to guide the plant along the trellis or net for the first little while.

Transplant them if at all possible and give them each their own pot. Depending on how big they are, and how developed their roots have become, untangling their root balls from each other might get tricky.

However, I think you'll soon realize how fast and spread out their leaves and vines will become once they mature. In my garden, a single cucumber plant (growing on the ground) spreads out to completely fill up a space of 3' by 4', and they have a tendency to invade and creep over into the section of my garden where I am growing my other veggies.

A trellis or vertical netting system will be the other alternative if you can't separate them from their pot. Otherwise, you'll likely end up with a big jumble of leaves and vines everywhere, which tends to be a favorable environment to cause fungus and mold growth.

I grew multiple plants in the same small pot with no problems:

https://veggie-might-sp8.blogspot.com/search/label/CUCUMBER