Assertion: comfrey | /r/CapableOf | serve as barrier
Facets:
value: to spreading grasses
type: TRANSITIVE-OBJECT
Source sentences:
text: It’s a nutrient rich ‘chop and drop’ mulch and compost activator, helps to break up compacted soils with its’ thick tuberous roots, can serve as a barrier to spreading grasses and weeds, and the leaves make a potent plant based liquid fertiliser.