At its best:
Jun, Jul, Aug, Sep
Place a couple of crocks in the base of your pot to aid drainage. Fill the pot with a good quality, peat-free multipurpose compost, topping off with a 3cm layer of seed compost. Water the compost thoroughly and allow to drain.
Using vermiculite or sand, divide the surface into thirds. Sow three types of seed - one in each section, spacing them at 5cm intervals.
Cover the surface with a fine layer of vermiculite.
Protect the seeds with a cloche until they have germinated. Thin overcrowded seedlings to 10cm, by gently prising them out using a pencil. Firm in the rest.