What area do you live in. The weather sure has a lot to do with how well cukes will grow. We lost all of our pickling cukes last year, because it got so hot, the roots got literally cooked in the ground.
We have found that lemon cukes withstand more climatic adversities. And they don't turn bitter if they don't get enough water!!! You can even pickle them.
By the way you can make relish using other vegies. As a matter of fact most relish recipes I have found use peppers. Zuccini makes a great relish, I also use green (as in unripe) tomatoes.
I used to think that you need cukes for relish also, until someone gave me a jar of zucchini relish. We didn't use it for a long time, because we thought it was weird. Then one day we needed relish for something and didn't have any. So I opened the jar of zucchini relish and found it to be just fantastic. I have since found the recipe and been making my own.