Here are some basic crossings and what you get

Green

Normal Green x Normal Green                                     Normal Green.

D-Green (Jade) x D-Green (Jade)                               Normal Green,

    D-Green (Jade),

    DD-Green (Olive).

D-Green (Jade) x Green Normal                                  D-Green (Jade),

    Green Normal.

DD-Green (Olive) x DD-Green (Olive)                          DD-Green (Olive).

DD-Green (Olive) x D-Green (Jade)                             D-Green (Jade),

    DD-Green (Olive).

DD-Green (Olive) x Normal Green                                D-Green (Jade).