In 2003 I visited Sydney and purchased several packets of Australian wildflower seeds at the Botanic Gardens. I recently came across them amongst my stuff, still unopened, and am wondering if I can still use them. I live in the Boston area, where the climate is harsher in the winter than you get over there. So, if I can still try planting the old seeds, could I grow these plants here - if not outdoors, then indoors in pots? The plants in question are Red Flowering Gum (Eucalyptus Ficifolia), Orange Banksia (Banksia Burdettii), and Red and Green Kangaroo Paw (Anigozanthos Manglesii).

Many thanks for your help.