As we all know growing invasive plants is not a good idea and is prohibited in many places. Unlike their cousins Ditch Lilies, daylilies are certainly not invasives, but they can become addictive. There are over seventy thousand registered cultivars so you are absolutely spoiled for choice. Lynne Cherot of Sensible Gardening and Living runs a daylily farm in Southern Canada and so knows a thing or two about these plants. I found her article on the Gardening Know How website.

I?ve been growing daylilies for a very long time, more years than I care to disclose. It all started many years ago when I developed an obsession for this flower and began in earnest to collect as many varieties as I could afford and manage. This grand collection turned into a small daylily farm business, to help support my addictive behavior.
Through this process I?ve met many others with the same affliction. I?ve learned much about this plant and how best to source it, how best to grow it and even enjoyed the process of making my own new varieties (hybridizing). Often called ?the perfect perennial, daylilies are invaluable to your garden and are a beautiful, adaptable plant that any one can grow.
How to Choose Daylilies:

?Ribbons & Curls Daylily?

Daylilies will grow in a wide variety of climate zones, from 2 to 9, however not all perform well in all zones. Whether you buy your daylilies from a local nursery or an online grower, it?s important to know that they are suitable for your gardening zone. This is perhaps a bigger problem for northern gardeners, as many daylilies which are hybridized in the southern zones, simply will not perform as well in the North. If zones are not provided on the plant information tag, you can use their foliage habit as a general guide to their hardiness. Dormant types are the most hardy, Semi-evergreens are somewhere in the middle and Evergreens are the least hardy. There are of course, many exceptions to this general guide.
If you are on the look out for a never ending choice in daylily cultivars, your best resource is through daylily growers who sell directly to their customers either from farm sales or mail order programs. Because daylily roots travel so well, spending a week or so in the mail system does them no harm. A reputable grower will send you large, healthy, bloom sized quality plants.
See more at Gardening Know How