Mel writes
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?

From the Environment Agency website:

"Control: Control measures should aim to prevent flowering and if this
is achieved before seeds are set, eradication is possible in two to
three years.

Chemical control: can use glyphosate or 2,4-D amine. Need to be used
whilst plant is actively growing in early spring for best effect.

Cutting/mowing/strimming: cut at ground level using a scythe, before the
flowering stage in June. Do not cut earlier as this promotes greater
seed production in any plants that regrow. Cutting should be repeated
annually until no more growth occurs.

Pulling: shallow-rooted plants can be pulled up very easily and disposed
of by burning or composting, unless seeds are present."


Does the same apply with rosebay willowherb?

That's a perennial, with clumps of big fat white roots. You can get rid
of it by repeated pulling, and although it seeds freely, it doesn't seem
to seed quite as freely as the smaller willowherbs


--
Kay