At its best:
Jul, Aug, Sep
Place crocks and a layer of gravel in the base of a large container, then fill with multi-purpose potting compost.
Mix water-retaining granules and slow-release fertiliser into the compost, to improve water retention and boost nutrient levels.
Choose several pelargoniums, including upright varieties for the centre and trailing, ivy-leaved varieties for the edges.
Keep the compost below the pot rim, to make watering easier, then water to settle compost around the rootballs.
Don't water again until the compost is dry. Regularly pick off faded flowers to promote formation of fresh blooms.