The amount of cucumbers needed per jar depends on the size of jar you use and the kind of cucumbers you have. Pickling cucumbers are smaller and more will be needed. You can also make pickle spears with pickling cucumbers. Cut them in half lengthwise and then in half again to create spears. Pickles keep in the refrigerator for months. Add jalapeno or habanero peppers to make spicy pickles. Don't forget to eat the onion slices too!