Just spotted some more details on the seeds. The bat attractor pack is a specially selected mix of night-scented wildflower seeds to attract insects for bats containing: bladder campion, red campion, night catch-fly, corn chamomile, cornflower, cowslip, evening primrose, field poppy, fleabane, foxglove, great mullein, corn marigold, soapwort, vipers bugloss, yarrow.
It also gives sowing guidelines: Sow March to May or September to October, outdoors directly onto soil where they are to flower, once the soil has warmed. For best results choose a poor, infertile soil in full sun and do not add fertiliser.
Maybe I should have looked this up first! ?