By Ichthus
United Kingdom 
my Centaurea Dealbata has sprouted well for the last four years. It begins to flower, but then it collapses in the centre, creating an uglymess. What causes this? I have observed it in a few other local gardens.
15 Jun, 2011
Previous question
« This started growing in my garden can you identify it please.
I've got a lot of these here and mine do that when they're too dry.
Also, because they get heavy - i've just bought a few plant supports to keep then upright and together and this stops the flop !!!
16 Jun, 2011