Answer: There are two common causes for what you are describing. The most common one, and particularly for container grown plants, is moisture stress -- cucumbers are primarily moisture and it takes a lot of water to plump them up. Make sure the soil is kept evenly moist all the time, but not sopping wet. Next, it is possible that there is a pollination problem if there is a lot of rain or there are few insects. You might try pollinating using a soft paint brush. I hope this helps!
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