A garden talk loomed. Line with dampened sphagnum moss, then stuff with potting mix that contains slow-release fertilizer. Staple, stitch or hot-glue the fabric opening once it is stuffed with soil. Make a slit in the straw or use a pre-existing one as I did. Also, be sure to select plants tolerant of similar growing conditions, dryish in the case of my two kinds of thyme and one Gazania, a clumping, daisy-like plant.
Sedums grow in a retired pair of boots.
There's the Boot Trick or the Chair Trick, both ways to recycle old items. Planting a boot is pretty self-explanatory. Add potting soil. Don't use dirt. It will be too heavy.