Common or Bell Heather

Can you recognise these two different species? Hint: Common Heather has distinct petals while Bell Heather has bell-shaped flowers and its leaves look like small Cedar twigs while those of Bell Heather resemble needles.
Common Heather is often confused with other species of heather such as Bell Heather. This confusion comes from the exploitation of heather soil, called “black gold”, a very good fertilizer used by gardeners. Indeed, Common Heather is able to grow on acid soils and even directly on the rock. The dead plant parts pile up and decompose and form black humus. Asters CEN74, manager of the nature reserve, is carrying out actions in order to preserve the Common Heather, which is gradually being colonized by ferns.