Bingo,

Have you ever considered getting a hive? You clearly have a knack for gardening and you dig bees. Why not become a beekeeper? There's a mild initial cost and some weekly tending until the colony is strong.

After that, it's not labor intense or terribly troublesome. The girls know what to do. You could probably harvest a gallon or so of honey after a year. Maybe sooner depending on the blooming in your area.

From the sound of things, you have the real estate for it. Even if you didn't, it really only takes as much room as the hive occupies. They'll travel to the pollen and nectar sources. Plenty of people have roof-top hives or balcony hives. Just make sure they have a steady source of water and they'll be fine.