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My mother has had Acanthus Mollis for nearly ten years and it has never flowered. We think her soil is Alkaline although I read that A. Mollis is happy in any soil. Does it just need lots of Potassium? Tomato food?
They are best treated mean as they flower best in poor soils. While we were looking for this house we rented one and neighbours had 3 fine specimens growing in gravelly soil at the foot of a brick gate post. They flowered their socks off every year and were stunning so I planted 3 when we started this garden.
I have extremely fertile loam soil and only ever get lush, healthy foliage.
We've just got back from hols in the Charente region of France where we saw masses of them in roadside verges in villages and at the foot of garden walls - full sun, well drained, alkaline gravelly soil, not a lot of food or water and flowering magnificently.
This autumn I will move mine to the one bit of poor soil I have, right on the edge of the road, well drained and in full sun. Fingers crossed for flowers next year.