John McCrohan Staff asked 16 years ago
I had groups of blue, white and yellow irises mixed together, but now there seems to be only blue ones in those positions. The few yellows or whites I see are alone. Do the blues kill off the opposition ( I’m told the European bluebell does this to the native Irish one by secreting a toxin into the ground – is this true?), or are they just better at surviving/longer lived?