The amount of water a perennial needs depends on the actual flower itself. It is best to let the plant dry out and not to water on a fixed schedule, as it can drown the plant.
They may be getting too much sun, or they need more water. Good luck with them.
perennials
Hops are perennials.
They are perennials. They are very hardy plants!
Yes but they are not hardy perennials and in the UK where we have cold winters dahlias need to be lifted, allowed to dry and stored in cool frost free conditions until spring when they can be replanted.
Both annuals and evergreen perennials. For example the Balsamina and the Gladulifera are annual and the New Guinea group perennials
Pilea, the Low-growing tropical perennials
you need greenhouses/hoop houses and trees, shrubs, perennials
There are dozens of marigolds, and some are annuals while some are perennials.
There are many varieties of daisies. Some are annuals and others are perennials.
to much
A Christmas tree, if real, is an evergreen. Most types of evergreens are perennials.