suggests that
If you allow weeds to seed themselves, it will take a long time to get rid of them; (figurative ly) if you allow an undesirable situation to spread, then it will be more difficult to eradicate it.
proverb
suggests that
If you allow weeds to seed themselves, it will take a long time to get rid of them; (figurative ly) if you allow an undesirable situation to spread, then it will be more difficult to eradicate it.