Even if the peel itself is inedible, if some of the fruit or vegetable flesh is still attached to the peel, it must be treated as having kedushas shevi is. According to the Chazon Ish and Rav Shlomo Zalman Auerbach, zt l , what is customary at the present time is what counts. Therefore, even if a certain type of peel may be edible, if people - or animals do not usually eat it, it has no kedushas shevi is. Rav Shmuel Wosner, on the other hand, holds that as long as a particular product is edible, even if it is not eaten, it has kedushas shevi is . Accordingly, cucumber peels, which are usually eaten, may not be thrown into the garbage as long as they are fit for consumption.
Banana peels are also fit for animal consumption.
Whatever has kedushas shevi is, but is not going to be eaten, should be wrapped and sealed in a plastic bag and kept till it starts to rot. Since it is then no longer fit even for animals, it may be thrown away. Note that one may not place fresh peels together with peels which have already started to rot, since the rotting peels will speed up the spoiling of the fresh peels. It is good practice to place all the day s peels and leftovers in one bag and then seal it. One does not need to be concerned that one type of peel rots at a faster rate than another.