I planted this Clematis Montana Grandiflora in 2014.
It grows to over 8 feet and has loads of green.
However last year we got 2 flowers in May and this year we had one.
I feed it clematis food every 7 - 10 day and have substituted tomato/seaweed food once just for a change.
The position is sheltered west facing and I use mulch and also cobbles to keep the roots cool.
Heavy clay soil
Has anyone got any ideas on why this is not flowering?