Deadhead Lychnis after the flowering period as this will prolong and encourage further growth for the following season. Cut your plant right down in the autumn as this will also aid in healthy growth. ... As Lychnis are relatively short lived, it is recommended that they are divided every 2-3 years during the spring.
What happens if you don't Deadhead?
Deadheading is the act of cutting off old blooms to encourage new ones. While roses will certainly bloom again if you don't deadhead, it is true they will rebloom quicker if you do.
What plants should I not deadhead?
Plants that don't need deadheading
- Sedum.
- Vinca.
- Baptisia.
- Astilbe.
- New Guinea Impatiens.
- Begonias.
- Nemesia.
- Lantana.
