Herbs love growing in raised beds, but raspberries do not. ... Raspberries also spread via underground runners and would escape a raised bed next season — probably by sending their new canes up into the middle of your tomatoes. So switch the herbs back to the bed and give the berries room to roam!

Do raspberry bushes multiply?

Raspberries multiply like rabbits, "precociously, prodigiously, and prolifically" according to Fine Gardening website. For every cane you plant one year, you can expect at least a dozen the following year. The plants send out underground runners in all directions to propagate.

How far do raspberries spread?

The important thing to remember when placing your permanent pathway is that you really do need to allow your raspberries a few feet to spread or you will never stop fighting them. My pathway is about 3 feet wide, then the space where I am allowing my raspberries to spread is about 4-5 feet wide.