Between the middle of the summer and the middle of the fall is the best time. I'm not entirely sure why this is, but I'm pretty certain this provides the plant the best chance of surviving.
As long as the soil is warm enough to grow plants and the daylilies can be seen, you can divide them.
After daylilies bloom, you should deadhead the spent flowers by cutting them off to encourage more blooms. Remove any yellow or withered leaves and water the plants regularly, making sure the soil is well-drained. Fertilize the daylilies in the spring and divide them every few years to prevent overcrowding.
Daylilies have a herbaceous stem. The old stems die and gardeners should compost them.
Rabbits and deer eat daylilies. Even cats will chew on daylilies.
There are daylilies in most temperate locations.
Yes. Daylilies can be grown in pots.
Deadhead daylilies regularly by removing spent blooms to encourage continuous blooming throughout the season.
Daylilies are very hardy. The pests that bother daylilies are rust, thrips, spider mites, snails, and crown rot.
To clean up daylilies effectively, remove dead foliage and spent flowers regularly, cut back any damaged or yellowing leaves, and divide overcrowded clumps every few years to promote healthy growth.
Most likely it is because your daylilies have too little or too much water. If you are concerned by the soil, have it tested and ask the expert what amendments you need for your daylilies. Most daylilies are very hardy.
After the blooms have died and the stems turn brown, daylilies can be cut back. If you want to divide the plant, which should be done every three or four years, do it in the early spring when the shoots appear. Two spades placed back to back are insert in the ground in the center of the donut-like shape of the plant. Pushed in to the soil, they will divide the plant in half. Remove one half and plant it elsewhere. If the plant is large and the center of the donut has not been divided in several years, the plant can be divided in to four sections, and each section replanted. Daylilies are very hardy and prefer lots of direct sun.
Iris is toxic to cattle but daylilies are not toxic.