Praise be to Allah.
This matter is open, because amputated limbs do not come under the same ruling as the whole person. There is no reason why they should not be put with the garbage, but burying them in the ground out of respect towards them is preferable. But the matter is open, praise be to Allaah, as we said. They do not have to be washed (ghusl) and buried unless it is a foetus of more than four months’ gestation. But if it was merely flesh into which the soul had not yet been breathed, or it was an amputated finger or something similar, then the matter is open. But burying it in the ground is good and is preferable.