An idea hit me the other day.
Some plants grow more aggressively than others and so get labeled invasive or non-invasive.
Maybe a better idea would be to give a strength rating 1 to 10 for aggressiveness.
And of course that would vary by environmental factors, ph, soil type, light level etc.
The variables might make the aggressiveness number meaningless, don't know, but mabey.
1
