At its best:
Jun, Jul, Aug, Sep
Fill a pot or seed tray with seed compost, and tamp it down.
Sow seed sparingly, following the instructions on the seed packet for sowing depth. Moisten your fingers to help pick up individual seeds.
Cover the seeds with vermiculite or horticultural grit, and label the tray.
Stand the tray in a shallow dish of water so the compost saturates without disturbing the seed. Allow to drain and then keep the tray on a sunny windowsill or in a heated propagator until germination.