Pale leaves on Cyclamen plants

I have 5 large cyclamen plants and when I bought them from an good garden centre they had large dark green leaves however over the last 2 weeks, on all the plants, one or two of the leaves have gone pale green (see pictures) - I cut these leaves off because apart from the fact that they look unsightly they are usually weak. However, it isn't long before more leaves are affected in the same way. This is common to all the plants so it must be something I am doing or not doing. At present I feed every watering with an organic 100% biological liquid fertilizer (Bio-Biz Bio-Bloom)- should I perhaps give them a shot of Phostrogen or such like? Looking at the leaves now I also think that they are getting smaller although this may be the younger leaves coming through. Does anyone recognise the problems I am having and if so do they have a solution. Incidentally all the plants are indoors in a warm environment.

 

Hi Charlie, I'm afraid I'm an inveterate cyclamen killer. Outside they're fine, but indoors they and my other favourites, begonia rex slowly die... and my house isn't very warm. My Aunt used to grow them like weeds, she had no central heating,they were on a windowsill getting lots of light but no direct sun, she always watered them from below with rainwater. Any help here? I do think yours may be too warm.

 

They are also probably being overfed! They need feeding once when they start into growth and then very little.

 

Yes I agree, it could be too warm, but also you always get a certain amount of dying leaves, as long as its the older ones and not the new ones I wouldn't worry too much.
You've got to remember they have had the usual nasty shock, one minute ideal conditions, then when in full flower moved to somewhere not so ideal, its bound to have some effect.

 

Ok thanks all for that I'm going to move them into a window to get more light and try the rainwater theory - I'll also cut off the pale leaves. Most of them are the larger older leaves however not all.