At its best:
Jun, Jul, Aug, Sep
Drill drainage holes in the base of the container, if necessary, add crocks and then fill two-thirds with compost. Cover the bottom of the pot with crocks, then fill it two-thirds with compost, mixed with a few handfuls of horticultural grit or sand.
Arrange the plants in the pot in any order you like.
Top up with compost, firming it around the roots with your fingers, then add a mulch of gravel to conserve moisture.
Water the container well and allow to drain before moving to its final position.