| The flowers open from bottom to top of the long spike so there will be seeds forming at the bottom while the top is still flowering. They grow taller in semi shade and among shrubs. Sometimes, when the main spike and the side spikes have finished, the part that has flowered dies out and leaves 'pups' or rosettes around the dead part ready to start again next season. (This is so for Digitalis purpurea, I haven't had much joy with D ambigua :-( ) Seed will sprout in the late summer after the autumn rains and the young plants stay as little, flat plants to survive the winter. They need to fall on bare earth to succeed, rather than into leaf mould or litter. If you have pot plants nearby - check for seedlings... As those long flower spikes move they can throw seed a long way. | 
