@Mattio 
I love the idea that you plan to grow daylilies in gardens around your bnb! I think a great majority of guests would love to stroll through the gardens, especially during peak bloom! I agree with Mike, though, that it would be wise to mix in other low maintenance perennials that bloom at different times of the season, for variety, and I'll add to that to include ornamental grasses, evergreens and trees for focal point and background plantings, along with Spring bulbs (as mentioned above) that pop up and bloom long before daylilies. The year round interest is much more pleasant to view, especially in the Winter months. You might even consider the bnb garden(s) to eventually become AHS approved tour garden(s). You'll attract not only local clubs and enthusiasts, but national, and even international clubs and visitors, which could potentially boost the bnb business. Just a thought.
If you're looking to attract local customers to begin with, speaking from experience as a small urban gardener, certain daylilies sell much easier locally, such as 'Stella De Oro', bc they're more well-known by the 'average' gardener than the other 80,000+ cultivars of the daylily world. These and just a few other daylily varieties are sold in the 'big box' stores, so you could check out what they are selling in your area. Additionally, you have to slightly undercut the big box store prices. A word of caution though....Don't buy yours from those stores bc the tags are more likely to be switched or dropped by Joe and Josephine public, so there's always the risk of winding up with NOIDS (daylilies that you are not 100% sure of the name, aka, NO IDentificationS) and therefore selling a daylily that turns out to be a different cultivar than the customer expects, so to avoid that, you could just take notes from the big box store inventories and buy those varieties from reputable dealers instead. On sites like this, those daylilies really don't sell, or even trade, well bc the community is much more experienced and crazy......ahem....enthused
about daylilies, and therefore well aware that there are so many more 'exotic' cultivars to choose from!
I highly suggest to use mulch, especially in viewing gardens, and eventually ground covers. These will keep the ground cool and moist while minimizing weeding significantly. In the farm areas, of course, mulch is a good choice, or it might be beneficial (and perhaps more cost effective) to lay down a good quality landscape fabric between the rows as a weed suppressant. It's just a suggestion, though. I do that in my (very small) veggie garden, but other experienced farmers, here, might chime in on that one, as I'm a simple hobby gardener.
Another word of caution....once you dive into the world of daylilies, there's no turning back, and you'll find that this community is a wonderful bunch of happy enablers
Good luck, and happy gardening!!
