The message
from martin contains these words:


Having read all the stuff about the unintentional spread of GM
plants, and seen giant hog weed growing along miles of grass verges,
how can you be careful not to let it escape?

Cutting off flower heads to prevent seeding would prevent any escape
from a garden planting.

Whereabouts have you seen heracleum mantegazzanium growing along miles
of grass verges?


Janet