In article , Nick
Gray writes

I've also just thought, that you could try chucking over some
Nasturtium (Tropaeolum majus) in March - May. Yellow, orange and
red
coloured flowers (amonst others). They are pretty vigorous and
should
self seed quite freely.

I really deprecate this "chuck them over" policy. It just isn't going
to work any more than "chuck it and chance it" will catch you a creel
of trout.

I beg to differ. How do the seeds of your plants get from the flower heads
to the soil? Mine fall, and wouldn't know the difference between falling
from a hand and falling from a seed pod.

That's the difference. Yours fall to the soil, where they have a chance
of growing. These seeds will be falling in to a mass of established
perennials where they will lose out in the competition for light.
--
Kay
"Do not insult the crocodile until you have crossed the river"