Re: Raised Garden Beds
If you have a problem with invasives, such as burmuda grass or ivy, then you'll need to kill and remove them in some manner, whether that be by herbicide or natural method. If it's just run of the mill grass and weeds, then scraping the dirt bare and setting your planter will be fine.
Landscape fabric in the bottom isn't a bad idea, though it will limit the depth at which things will grow, such as a carrot, obviously not an issue with an herb garden.
Same applies for your strawberry pyramid.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!