 Like most other <unk> , Banksia violacea has <unk> roots , roots with dense clusters of short lateral rootlets that form a mat in the soil just below the leaf litter . These enhance <unk> of nutrients , thus allowing their uptake in low @-@ nutrient soils such as the phosphorus @-@ deficient soils of Australia . B. violacea is highly susceptible to <unk> <unk> <unk> . 
