Because of the sheer size of the plot, each of these is a fairly major project in its own right. This suggests a phased approach, probably spread across a few years.
The display beds would be planted up with bands or clumps of eye-catching flowering and non-flowering plants that occur naturally on the Downs, avoiding the (possibly unhelpful) introduction of new species. This arrangement would help people learn to distinguish between the variety of species we have - not all yellow flowers are dandelions!
The large planter/raised bed as shown in the picture on the left would be about 22 metres by 5 metres by 0.5-1 metres deep, and contain plants that would naturally occur on a stable shingle beach. The retaining wall would be made of driftwood spars and timbers reclaimed from the ongoing replacement and repair of local groynes and breakwaters. This “re-use, recycle” approach would be both environmentally responsible, and in keeping with the location.
The murals could be an animal and plant identification guide - possibly the longest information panel ever! They could also pick up on a theme used elsewhere in Herne Bay and show a timeline in pictures from prehistory to the present day. Another possibility is that, like the pebble mosaic, they could be based on coastal-themed designs contributed by local schools.