Perennial plants flower only when they have reached a certain age and been subjected to the cold. These two circumstances prevent the plant from starting to flower during winter. Botanists have now ...

This news release is available in German. Perennial plants flower only when they have reached a certain age and been subjected to the cold. These two circumstances prevent the plant from starting to ...

What perennial flowers would you suggest to plant so I can have color all spring, summer and fall? Most perennial flowers have a bloom period of three to six weeks. By choosing three or more different ...

I plan to plant more perennial flowers this spring so I don’t have to replant every year. Could you share with us some of your favorite perennial flowers? How do they bloom in comparison to annuals?

Alpine rock cress uses a ribonucleic acid to measure its age and tell when it’s the right time to flower Perennial plants flower only when they have reached a certain age and been subjected to the ...