I really like dill, so I would like to have a constant supply of it in my garden. 

However, every time I sow dill, it grows and has some leaves, eventually flowers and I am left without any of it. 

Having recently read the question on [Best conditions for basil](https://gardening.stackexchange.com/questions/81/what-are-the-best-conditions-for-basil)
 I have seen how beneficial flower pinching is.

My question is, can dill's life be prolonged by removing the flowers and pinching the stem? Or is it just a plant with short lifespan and the only way of having constant supply of it is by reseeding every 2-4 weeks?