I've taken over a neglected alloment.

Some of the raised beds are full of soggy, slimy stems of himalayan balsam
which, in a way, is fortunate, because they've crowded out all the other
weeds.

I know that I'll have to deal with seedlings, but am I right in thinking
that, because they're annuals, I can rake up the old stems and then rotavate
the beds and they won't regrow from the roots?

Does the same apply with rosebay willowherb?

Thank.