I planted sweetpeas out last weekend after hardening off. A few of the plants leaves have started to turn a purple/red colour, why is this? Is it a fungus?
It might be the cold weather we've had.
I don't think it is anything fungal, I would put it down to the weather. if they begin to look like they are dying then try moving them back into a warmer location.
But I think they should be fine and that it wont have a negative affect on the plants!
Hope this helps a little.
I don't grow sweetpeas but I've seen other plants take on a purplish hue when the weather is too cold for them
Perfectly normal, they'll be fine.