I interplant a lot of perennials and annual flowers in my garden to attract pollinators and maintain a healthy local population of native bees, wasps and flies, etc. Honeybees are wonderful, but are not native to America and are only a portion of all the wonderful pollinators we can rely on. Providing a food source as well as habitat is a good way to help foster insect population in and around your garden.
I noticed this year we have a significant drop in honeybees on my property as well as other pollinators. I just hope the new neighbor aren't spraying for each and every crawling and flying creatures around in the hopes of getting a perfectly manicured lawn. We're in the countryside here, but we have lots of new "city people" moving in and they don't seem to understand the harm in spraying their lawns against insects.
Here are some of the pollinator friendly plants I grow around the garden:
Yarrow: flowers are attractive to a range of pollinators and the lace foliage acts as a habitat to ladybug
Bee Balm (monarda): very attractive to pollinators, namely butterflies and bees. Hummingbirds also love those
Catmint or Nepeta: very attractive to bumblebees and other bees as well as butterflies
Echinacea: slow to grow but super drought resistant and great for beneficial insects
Calendula: this one is great as it grows fast, attracts natives bees in throve and repels pests.
Sweet Alyssum: start from seed and let spread around. It's a great ground cover and feeds the pollinator
Chamomile: I keep an entire 4X4 bed of this and let it reseed year after year. Ladybugs breed in there and it also attracts pollinator
There are more, I'm sure, but those are a few I never miss. The first 4 are perennials, so they are a great investment but won't flower much in the first year (except catmint), so it would be good to add the annuals as well. Don't be tempted to use the exotic annuals sold in nurseries as they are pretty, but don't provide much for the insect population.
That's it! Happy Gardening!