Evening primrose?
If you cut the main flower back to the buds on the stem you will get a second flush of flowers.
There are a LOT of different types of salvia. Some are perennial and some are annual. If yours is a perennial you should cut it back for the winter. Recommendations differ for different climates, but usually you can cut it back to 6-8 inches. Leave the stems a little taller in Prairie climates.
After blooming is done, you can cut back the flower stalks, but don't cut back the leaves until you are ready to separate and transplant irises in the fall. When you take them out to replant, cut the leaves down into about a 4 to 5 inch fan shape.
Cut it down
It's okay to cut them back immediately after they are done blooming. Follow the stalk down to about an inch of the base of the plant and snip.
They will not re bloom. They will bloom in a vase of water if cut before blooming.
Yes, but only the flower stems not the leaves.
The address of the Primrose Public Library is: 229 Commercial Street, Primrose, 68655 0005
There is probably some exotic flower which only blooms for one day, period, but I don't know what it is. However, I do know that each daylily blossom lasts only for one day, then it wilts. Daylilies have many blossoms and the blooming will continue for quite some time, often a month or more. Also, there are some "reblooming" varieties that start blooming again in the fall if they have been cut back after the first flush of blooms.
blooming
Normally after flowering