create object a random number of times ruby

def pass_growing_season
 self.age += 1
 if self.age >= 6
   harvested_oranges << Orange.new   #NEED 100 - 300 !!!
 end
 if self.height < 25
   self.height += 2.5
 end
end

I am trying to initialize an Orange class that is defined in another file. Right now I have one new object getting shoveled into an empty array. I want to create a random number them between 100 and 300. So far I have tried

harvested_oranges = Orange.new(rand(100.300))

but I get an error telling me the Orange.new is taking an argument and isn't supposed to... must not be the right plan... any help would be great!