How to set limits for axes in ggplot2 R plots?

I plot the following:

library(ggplot2)    

carrots <- data.frame(length = rnorm(500000, 10000, 10000))
cukes <- data.frame(length = rnorm(50000, 10000, 20000))
carrots$veg <- 'carrot'
cukes$veg <- 'cuke'
vegLengths <- rbind(carrots, cukes)

ggplot(vegLengths, aes(length, fill = veg)) +
 geom_density(alpha = 0.2)

Now say, I only want to plot the region between x=-5000 to 5000, instead of the entire range.

How can I do that?