Yes, I buy cypress mulch (not cedar as I stated.....sorry, I'm old
) by the yard at our local Co-Op. I think cypress lasts longer than pine or typical hardwood mulch. I simply placed around 6" of the cypress mulch down (I sit on clay and it just doesn't drain) and then the fabric flooring. That mulch will ultimately become nice, organic compost and when it does that, I just pull the fabric back and replenish the cypress. I just did that in both greenhouses, now that they are mostly emptied of plants. Cypress mulch can also be found at Lowes in 2 and 3 cf. bags, and it is pretty good quality.