It may be an interesting approach to prevent pedestrians from crossing the roads and damaging the plants, but I doubt some of the plants e.g. Hymenocallis speciosa (common name: Spiderliliy; Family: Amaryllidaceae) would do well if there is a dry spell. Moreover, I fear the areas on one side of the Yellow Flame trees were covered with excessive soil, thus suffocating some of the roots, and this may present problems down the road.