What does an " an unweeded garden" mean in Hamlet?

An unweeded garden is one that is ignored - allowed to go to seed and become ugly and overrun. There is no beauty, harmony or order in an unweeded garden. He is talking about the world. Basically he is saying that he came home to Denmark and found everything gone straight to hell. His mother is married to his uncle, his father is dead. His whole world is out of order. Pax-C