A 20 inch pot is large enough to grow cucumber plants. grow plants in a five-gallon pail or one bush type cuke in a deep pot. A rectangular planter box or window box is perfect for growing cukes on a trellis.
I do the apple cider vinegar fruit trap, but never broke the tension of the vinegar with a couple drops of dish soap. Hmm maybe I'll collet more with this method. Make a super easy and effective trap to rid your kitchen of pesky fruit flies.