Incredible Patio Raised Garden Bed Drainage References. Once that’s completed, install your bed on the ground and set a level on top of one of the long sides. Web to ensure proper drainage in raised garden beds, be sure to add soil amendments such as perlite, vermiculite, and compost.

If you already have an existing raised garden bed and you’re. Web one of the most common ways to improve drainage in raised garden beds is to dig some earth in the bottom of the bed. 210 june 2016 i always had the understanding that the interior wall of bed was rendered to stop soil stains bleeding through and you lay bed on a normal soil base, perhaps with some rubble at the bottom to ease drainage.then you can plant ur lavender or rosemary etc in it.