That means all of the resources that the plant sends up to the flowers in an effort to save the seeds winds up going towards trichome production instead!
A lot of other cool things happen when you starve. Resin and oil production dramatically goes up when mosture becomes scarce. This is because up to a point the oils that cannabis produces are able to take the place of water for some tasks. Maintaining turgidity, propping up the cell structure and keeping the sap layer free-flowing are all things that oil can do when there isn't enough water around.
-DM