ruderal
1 of 2adjective
ru·der·al ˈrü-də-rəl 
: growing where the natural vegetational cover has been disturbed by humans
ruderal weeds of old fields and roadsides
ruderal
2 of 2noun
: a weedy and commonly introduced plant growing where the vegetational cover has been interrupted
Word History
Etymology
Adjective
New Latin ruderalis, from Latin ruder-, rudus rubble
First Known Use
Adjective
1835, in the meaning defined above
Noun
1873, in the meaning defined above