Describe how grief make Heathcliff behave in the garden?

You can read about this in Chapter 16. Heathcliff is out
in the garden outside Catherine's window while she is giving birth to young Catherine.
Catherine dies two hours later. Heathcliff's mourning for her is as passionate as his
love for her was when she was alive. He curses Catherine for causing him such  pain in
his life but then pleads with her spirit to haunt him for the rest of his life. He says
he does not care what form she takes, she can even drive him to madness, as long as she
never leaves him. Weird, huh?

Heathcliff stays out in the
garden all night. When Edgar leaves Catherine's side, Nelly lets him in for a brief
moment and he takes a piece of his hair and puts it in Catherine's locket instead of
Edgar's hair. When he leaves, Nelly takes both locks of hair and winds them together,
then closes the locket. This is symbolic of the two men in Catherine's life - Heathcliff
and Edgar - the two men that loved her. Heathcliff goes from bad to worse after
Catherine's death.