Based on the context and the answer, generate a question. 

Context: Bohemia and climbed that . I went up Black Bear , which is less steep than pretty much any other run , but it is completely covered in brush . It happens that about 1/6 of that is raspberries , and another 1/6 thimbleberries ( like raspberries ) , so I had a sustained snack the whole way up .

Answer:

There is brush covering the trail .



Why is Black Bear a difficult run ?