Advice on care for certain perennials please
Can you offer advise on which perennials benefit from being cut back and others left please?
1. Agastache blue fortune. Cut back or leave? This has really sprawled and I think I should dig it up and move it to a place where i can stake it properly. Also does it benefit from chelsea chop to help it stand better?
2. Savlia caradonna. Looks pretty good and is still standing nicely with the seed things on - think I should leave well alone and just cut back to ground in spring?
3. Lychnis coronaria - Again really tall and has sprawled everywhere..leave or cut back? how far to cut back?
4. Monarda - about 18 inches tall and standing quite nicely with seed heads. Again leave and cut back in spring? how far to cut them back please?