You could learn how to keep a beehive
Not only will you get to have delicious honey, they will do a fantastic job at pollinating your garden for you!
You can plant bee friendly plants in your backyard
Honey bees like introduced plant species such as Lavendar, Rosemary, Lemon Balm and Thyme
Or most blue, purple and yellow flowering plants are their favourites- but they can't see red!
Comfrey and Borage are rich in nectar and so are the carrot family such as fennel, coriander and parsley so don't worry about some of your veggie garden going to flower!
Native bees prefer native flowers and are the best at pollinating them too!
Think Pohutakawa, Kowhai and Manuka
Native bees do not travel far so try keep their food source abundant and nearby their underground homes
You do not need to plant a bee friendly garden specifically, just pop a few extra natives and honey bee friendly plants in and around the veggie and flower garden you already have
And try to attract them by providing a substantial amount of flowers all year round