Can any body help!. I planted a nursery bought Acanthus Three years ago and it has never flowered. Lots of healthy foliage but never a hint of a flower. <span>I thought it may have been planted too deep so i lifted it last year and replanted it last year, still nothing. It is in moist, well drained fertile soil. In a sunny spot. The roots are about half an inch thick and and very strong and adventurous.