Anyone know of any decent online references ?

I have several mature basil plants, but they have gone into flower.

Is this good ? I am trying to maximise crop and longevity.

Once cropped, will they regrow or should I replant more from seed ?

I also have a mature Bayleaf (shrub !) and some large Rosemary plants.

Should these be cut back or left to grow to maximise crop ?

Any herb help appreciated.

Thanks

Paul.