Q.Placing A Raised Garden Bed On Aggregate Concrete
I live in the Okanogan where it gets very hot and dry in the summer. I want to put a raised garden bed on my aggregate patio. I was told to put old plastic pop bottles as a base and then cover it with fabric before placing the soil in the box. Is this a good idea?

Certified GKH Gardening Expert
Is the purpose to take up room in the bottom so you don't have to fill the whole box with soil? If so, I would not use the fabric because it would stop the roots. If it is to protect the patio, that would work but you need to have enough soil for the roots of whatever you are growing. Here are raised bed ideas for patios:
https://www.gardeningknowhow.com/special/accessible/building-table-gardens.htm
https://www.gardeningknowhow.com/special/spaces/small-raised-bed.htm
https://www.gardeningknowhow.com/special/xeriscape/using-raised-beds-for-hot-regions.htm
https://www.gardeningknowhow.com/special/urban/gardens-in-small-spaces.htm
https://www.gardeningknowhow.com/edible/vegetables/vgen/raised-bed-soil-depth.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/best-soil-raised-garden-beds.htm